POSIX — Functions

• FD_CLR(3) — macros for synchronous I/O multiplexing
• _Exit(3) — _exit terminate a process
• _longjmp(3) — _setjmp non-local goto
• _tolower(3) — transliterate uppercase characters to lowercase
• _toupper(3) — transliterate lowercase characters to uppercase
• a64l(3) — l64a convert between a 32-bit integer and a radix-64 ASCII string
• abort(3) — generate an abnormal process abort
• abs(3) — return an integer absolute value
• accept(3) — accept a new connection on a socket
• access(3) — faccessat determine accessibility of a file descriptor
• acos(3) — acosf, acosl arc cosine functions
• acosh(3) — acoshf, acoshl inverse hyperbolic cosine functions
• acosl(3) — arc cosine functions
• aio_cancel(3) — cancel an asynchronous I/O request
• aio_error(3) — retrieve errors status for an asynchronous I/O operation
• aio_fsync(3) — asynchronous file synchronization
• aio_read(3) — asynchronous read from a file
• aio_return(3) — retrieve return status of an asynchronous I/O operation
• aio_suspend(3) — wait for an asynchronous I/O request
• aio_write(3) — asynchronous write to a file
• alarm(3) — schedule an alarm signal
• alphasort(3) — scandir scan a directory
• asctime(3) — asctime_r convert date and time to a string
• asin(3) — asinf, asinl arc sine function
• asinh(3) — asinhf, asinhl inverse hyperbolic sine functions
• asinl(3) — arc sine function
• assert(3) — insert program diagnostics
• atan(3) — atanf, atanl arc tangent function
• atan2(3) — atan2f, atan2l arc tangent functions
• atanf(3) — arc tangent function
• atanh(3) — atanhf, atanhl inverse hyperbolic tangent functions
• atanl(3) — arc tangent function
• atexit(3) — register a function to run at process termination
• atof(3) — convert a string to a double-precision number
• atoi(3) — convert a string to an integer
• atol(3) — atoll convert a string to a long integer
• basename(3) — return the last component of a pathname
• bind(3) — bind a name to a socket
• bsearch(3) — binary search a sorted table
• btowc(3) — single byte to wide character conversion
• cabs(3) — cabsf, cabsl return a complex absolute value
• cacos(3) — cacosf, cacosl complex arc cosine functions
• cacosh(3) — cacoshf, cacoshl complex arc hyperbolic cosine functions
• cacosl(3) — complex arc cosine functions
• calloc(3) — a memory allocator
• carg(3) — cargf, cargl complex argument functions
• casin(3) — casinf, casinl complex arc sine functions
• casinh(3) — casinhf, casinhl complex arc hyperbolic sine functions
• casinl(3) — complex arc sine functions
• catan(3) — catanf, catanl complex arc tangent functions
• catanh(3) — catanhf, catanhl complex arc hyperbolic tangent functions
• catanl(3) — complex arc tangent functions
• catclose(3) — close a message catalog descriptor
• catgets(3) — read a program message
• catopen(3) — open a message catalog
• cbrt(3) — cbrtf, cbrtl cube root functions
• ccos(3) — ccosf, ccosl complex cosine functions
• ccosh(3) — ccoshf, ccoshl complex hyperbolic cosine functions
• ccosl(3) — complex cosine functions
• ceil(3) — ceilf, ceill ceiling value function
• cexp(3) — cexpf, cexpl complex exponential functions
• cfgetispeed(3) — get input baud rate
• cfgetospeed(3) — get output baud rate
• cfsetispeed(3) — set input baud rate
• cfsetospeed(3) — set output baud rate
• chdir(3) — change working directory
• chmod(3) — fchmodat change mode of a file
• chown(3) — fchownat change owner and group of a file
• cimag(3) — cimagf, cimagl complex imaginary functions
• clearerr(3) — clear indicators on a stream
• clock(3) — report CPU time used
• clock_getcpuclockid(3) — access a process CPU-time clock (ADVANCED REALTIME)
• clock_getres(3) — clock_gettime, clock_settime clock and timer functions
• clock_nanosleep(3) — high resolution sleep with specifiable clock
• clock_settime(3) — clock and timer functions
• clog(3) — clogf, clogl complex natural logarithm functions
• close(3) — close a file descriptor
• closedir(3) — close a directory stream
• closelog(3) — openlog, setlogmask, syslog control system log
• confstr(3) — get configurable variables
• conj(3) — conjf, conjl complex conjugate functions
• connect(3) — connect a socket
• copysign(3) — copysignf, copysignl number manipulation function
• cos(3) — cosf, cosl cosine function
• cosh(3) — coshf, coshl hyperbolic cosine functions
• cosl(3) — cosine function
• cpow(3) — cpowf, cpowl complex power functions
• cproj(3) — cprojf, cprojl complex projection functions
• creal(3) — crealf, creall complex real functions
• creat(3) — create a new file or rewrite an existing one
• crypt(3) — string encoding function (CRYPT)
• csin(3) — csinf, csinl complex sine functions
• csinh(3) — csinhf, csinhl complex hyperbolic sine functions
• csinl(3) — complex sine functions
• csqrt(3) — csqrtf, csqrtl complex square root functions
• ctan(3) — ctanf, ctanl complex tangent functions
• ctanh(3) — ctanhf, ctanhl complex hyperbolic tangent functions
• ctanl(3) — complex tangent functions
• ctermid(3) — generate a pathname for the controlling terminal
• ctime(3) — ctime_r convert a time value to a date and time string
• daylight(3) — daylight savings time flag
• daylight(3) — timezone, tzname, tzset set timezone conversion information
• dbm_clearerr(3) — dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store database functions
• difftime(3) — compute the difference between two calendar time values
• dirfd(3) — extract the file descriptor used by a DIR stream
• dirname(3) — report the parent directory name of a file pathname
• div(3) — compute the quotient and remainder of an integer division
• dlclose(3) — close a symbol table handle
• dlerror(3) — get diagnostic information
• dlopen(3) — open a symbol table handle
• dlsym(3) — get the address of a symbol from a symbol table handle
• dprintf(3) — fprintf, printf, snprintf, sprintf print formatted output
• dprintf(3) — print formatted output
• drand48(3) — erand48, jrand48, lcong48, lrand48, mrand48, nrand48, seed48, srand48 generate uniformly distributed pseudo-random numbers
• dup(3) — dup2 duplicate an open file descriptor
• duplocale(3) — duplicate a locale object
• encrypt(3) — encoding function (CRYPT)
• endgrent(3) — getgrent, setgrent group database entry functions
• endhostent(3) — gethostent, sethostent network host database functions
• endnetent(3) — getnetbyaddr, getnetbyname, getnetent, setnetent network database functions
• endprotoent(3) — getprotobyname, getprotobynumber, getprotoent, setprotoent network protocol database functions
• endpwent(3) — getpwent, setpwent user database functions
• endservent(3) — getservbyname, getservbyport, getservent, setservent network services database functions
• endutxent(3) — getutxent, getutxid, getutxline, pututxline, setutxent user accounting database functions
• environ(3) — array of character pointers to the environment strings
• environ(3) — execl, execle, execlp, execv, execve, execvp, fexecve execute a file
• erand48(3) — generate uniformly distributed pseudo-random numbers
• erf(3) — erff, erfl error functions
• erfc(3) — erfcf, erfcl complementary error functions
• erff(3) — erfl error functions
• errno(3) — error return value
• exit(3) — terminate a process
• exp(3) — expf, expl exponential function
• exp2(3) — exp2f, exp2l exponential base 2 functions
• expm1(3) — expm1f, expm1l compute exponential functions
• fabs(3) — fabsf, fabsl absolute value function
• faccessat(3) — determine accessibility of a file relative to directory file descriptor
• fattach(3) — attach a STREAMS-based file descriptor to a file in the file system name space (STREAMS)
• fchdir(3) — change working directory
• fchmod(3) — change mode of a file
• fchmodat(3) — change mode of a file relative to directory file descriptor
• fchown(3) — change owner and group of a file
• fchownat(3) — change owner and group of a file relative to directory file descriptor
• fclose(3) — close a stream
• fcntl(3) — file control
• fdatasync(3) — synchronize the data of a file (REALTIME)
• fdetach(3) — detach a name from a STREAMS-based file descriptor (STREAMS)
• fdim(3) — fdimf, fdiml compute positive difference between two floating-point numbers
• fdopen(3) — associate a stream with a file descriptor
• fdopendir(3) — opendir open directory associated with file descriptor
• feclearexcept(3) — clear floating-point exception
• fegetenv(3) — fesetenv get and set current floating-point environment
• fegetexceptflag(3) — fesetexceptflag get and set floating-point status flags
• fegetround(3) — fesetround get and set current rounding direction
• feholdexcept(3) — save current floating-point environment
• feof(3) — test end-of-file indicator on a stream
• feraiseexcept(3) — raise floating-point exception
• ferror(3) — test error indicator on a stream
• fesetenv(3) — set current floating-point environment
• fesetexceptflag(3) — set floating-point status flags
• fesetround(3) — set current rounding direction
• fetestexcept(3) — test floating-point exception flags
• feupdateenv(3) — update floating-point environment
• fexecve(3) — execute a file
• fflush(3) — flush a stream
• ffs(3) — find first set bit
• fgetc(3) — get a byte from a stream
• fgetpos(3) — get current file position information
• fgets(3) — get a string from a stream
• fgetwc(3) — get a wide-character code from a stream
• fgetws(3) — get a wide-character string from a stream
• fileno(3) — map a stream pointer to a file descriptor
• flockfile(3) — ftrylockfile, funlockfile stdio locking functions
• floor(3) — floorf, floorl floor function
• fma(3) — fmaf, fmal floating-point multiply-add
• fmax(3) — fmaxf, fmaxl determine maximum numeric value of two floating-point numbers
• fmemopen(3) — open a memory buffer stream
• fmin(3) — fminf, fminl determine minimum numeric value of two floating-point numbers
• fmod(3) — fmodf, fmodl floating-point remainder value function
• fmtmsg(3) — display a message in the specified format on standard error and/or a system console
• fnmatch(3) — match a filename string or a pathname
• fopen(3) — open a stream
• fork(3) — create a new process
• fpathconf(3) — pathconf get configurable pathname variables
• fpclassify(3) — classify real floating type
• fputc(3) — put a byte on a stream
• fputs(3) — put a string on a stream
• fputwc(3) — put a wide-character code on a stream
• fputws(3) — put a wide-character string on a stream
• fread(3) — binary input
• free(3) — free allocated memory
• freeaddrinfo(3) — getaddrinfo get address information
• freelocale(3) — free resources allocated for a locale object
• freopen(3) — open a stream
• frexp(3) — frexpf, frexpl extract mantissa and exponent from a double precision number
• fscanf(3) — scanf, sscanf convert formatted input
• fseek(3) — fseeko reposition a file-position indicator in a stream
• fsetpos(3) — set current file position
• fstat(3) — get file status
• fstatat(3) — lstat, stat get file status
• fstatvfs(3) — statvfs get file system information
• fsync(3) — synchronize changes to a file
• ftell(3) — ftello return a file offset in a stream
• ftok(3) — generate an IPC key
• ftruncate(3) — truncate a file to a specified length
• ftrylockfile(3) — stdio locking functions
• ftw(3) — traverse (walk) a file tree
• funlockfile(3) — stdio locking functions
• futimens(3) — utimensat, utimes set file access and modification times
• fwide(3) — set stream orientation
• fwprintf(3) — swprintf, wprintf print formatted wide-character output
• fwrite(3) — binary output
• fwscanf(3) — swscanf, wscanf convert formatted wide-character input
• gai_strerror(3) — address and name information error description
• getaddrinfo(3) — get address information
• getc(3) — get a byte from a stream
• getc_unlocked(3) — getchar_unlocked, putc_unlocked, putchar_unlocked stdio with explicit client locking
• getchar(3) — get a byte from a stdin stream
• getchar_unlocked(3) — stdio with explicit client locking
• getcwd(3) — get the pathname of the current working directory
• getdate(3) — convert user format date and time
• getdelim(3) — getline read a delimited record from stream
• getegid(3) — get the effective group ID
• getenv(3) — get value of an environment variable
• geteuid(3) — get the effective user ID
• getgid(3) — get the real group ID
• getgrent(3) — get the group database entry
• getgrgid(3) — getgrgid_r get group database entry for a group ID
• getgrnam(3) — getgrnam_r search group database for a name
• getgroups(3) — get supplementary group IDs
• gethostent(3) — network host database functions
• gethostid(3) — get an identifier for the current host
• gethostname(3) — get name of current host
• getitimer(3) — setitimer get and set value of interval timer
• getline(3) — read a delimited record from stream
• getlogin(3) — getlogin_r get login name
• getmsg(3) — getpmsg receive next message from a STREAMS file (STREAMS)
• getnameinfo(3) — get name information
• getnetbyaddr(3) — getnetbyname, getnetent network database functions
• getopt(3) — optarg, opterr, optind, optopt command option parsing
• getpeername(3) — get the name of the peer socket
• getpgid(3) — get the process group ID for a process
• getpgrp(3) — get the process group ID of the calling process
• getpid(3) — get the process ID
• getpmsg(3) — receive next message from a STREAMS file
• getppid(3) — get the parent process ID
• getpriority(3) — setpriority get and set the nice value
• getprotobyname(3) — getprotobynumber, getprotent network protocol database functions
• getpwent(3) — get user database entry
• getpwnam(3) — getpwnam_r search user database for a name
• getpwuid(3) — getpwuid_r search user database for a user ID
• getrlimit(3) — setrlimit control maximum resource consumption
• getrusage(3) — get information about resource utilization
• gets(3) — get a string from a stdin stream
• getservbyname(3) — getservbyport, getservent network services database functions
• getsid(3) — get the process group ID of a session leader
• getsockname(3) — get the socket name
• getsockopt(3) — get the socket options
• getsubopt(3) — parse suboption arguments from a string
• gettimeofday(3) — get the date and time
• getuid(3) — get a real user ID
• getutxent(3) — getutxid, getutxline get user accounting database entries
• getwc(3) — get a wide character from a stream
• getwchar(3) — get a wide character from a stdin stream
• glob(3) — globfree generate pathnames matching a pattern
• gmtime(3) — gmtime_r convert a time value to a broken-down UTC time
• grantpt(3) — grant access to the slave pseudo-terminal device
• hcreate(3) — hdestroy, hsearch manage hash search table
• htonl(3) — htons, ntohl, ntohs convert values between host and network byte order
• hypot(3) — hypotf, hypotl Euclidean distance function
• iconv(3) — codeset conversion function
• iconv_close(3) — codeset conversion deallocation function
• iconv_open(3) — codeset conversion allocation function
• if_freenameindex(3) — free memory allocated by if_nameindex
• if_indextoname(3) — map a network interface index to its corresponding name
• if_nameindex(3) — return all network interface names and indexes
• if_nametoindex(3) — map a network interface name to its corresponding index
• ilogb(3) — ilogbf, ilogbl return an unbiased exponent
• imaxabs(3) — return absolute value
• imaxdiv(3) — return quotient and remainder
• inet_addr(3) — inet_ntoa IPv4 address manipulation
• inet_ntop(3) — inet_pton convert IPv4 and IPv6 addresses between binary and text form
• initstate(3) — random, setstate, srandom pseudo-random number functions
• insque(3) — remque insert or remove an element in a queue
• ioctl(3) — control a STREAMS device (STREAMS)
• isalnum(3) — isalnum_l test for an alphanumeric character
• isalpha(3) — isalpha_l test for an alphabetic character
• isascii(3) — test for a 7-bit US-ASCII character
• isastream(3) — test a file descriptor (STREAMS)
• isatty(3) — test for a terminal device
• isblank(3) — isblank_l test for a blank character
• iscntrl(3) — iscntrl_l test for a control character
• isdigit(3) — isdigit_l test for a decimal digit
• isfinite(3) — test for finite value
• isgraph(3) — isgraph_l test for a visible character
• isgreater(3) — test if x greater than y
• isgreaterequal(3) — test if x is greater than or equal to y
• isinf(3) — test for infinity
• isless(3) — test if x is less than y
• islessequal(3) — test if x is less than or equal to y
• islessgreater(3) — test if x is less than or greater than y
• islower(3) — islower_l test for a lowercase letter
• isnan(3) — test for a NaN
• isnormal(3) — test for a normal value
• isprint(3) — isprint_l test for a printable character
• ispunct(3) — ispunct_l test for a punctuation character
• isspace(3) — isspace_l test for a white-space character
• isunordered(3) — test if arguments are unordered
• isupper(3) — isupper_l test for an uppercase letter
• iswalnum(3) — iswalnum_l test for an alphanumeric wide-character code
• iswalpha(3) — iswalpha_l test for an alphabetic wide-character code
• iswblank(3) — iswblank_l test for a blank wide-character code
• iswcntrl(3) — iswcntrl_l test for a control wide-character code
• iswctype(3) — iswctype_l test character for a specified class
• iswdigit(3) — iswdigit_l test for a decimal digit wide-character code
• iswgraph(3) — iswgraph_l test for a visible wide-character code
• iswlower(3) — iswlower_l test for a lowercase letter wide-character code
• iswprint(3) — iswprint_l test for a printable wide-character code
• iswpunct(3) — iswpunct_l test for a punctuation wide-character code
• iswspace(3) — iswspace_l test for a white-space wide-character code
• iswupper(3) — iswupper_l test for an uppercase letter wide-character code
• iswxdigit(3) — iswxdigit_l test for a hexadecimal digit wide-character code
• isxdigit(3) — isxdigit_l test for a hexadecimal digit
• j0(3) — j1, jn Bessel functions of the first kind
• jrand48(3) — generate a uniformly distributed pseudo-random long signed integer
• kill(3) — send a signal to a process or a group of processes
• killpg(3) — send a signal to a process group
• l64a(3) — convert a 32-bit integer to a radix-64 ASCII string
• labs(3) — llabs return a long integer absolute value
• lchown(3) — change the owner and group of a symbolic link
• lcong48(3) — seed a uniformly distributed pseudo-random signed long integer generator
• ldexp(3) — ldexpf, ldexpl load exponent of a floating-point number
• ldiv(3) — lldiv compute quotient and remainder of a long division
• lfind(3) — find entry in a linear search table
• lgamma(3) — lgammaf, lgammal, signgam log gamma function
• link(3) — linkat link one file to another file
• lio_listio(3) — list directed I/O
• listen(3) — listen for socket connections and limit the queue of incoming connections
• llabs(3) — return a long integer absolute value
• lldiv(3) — compute quotient and remainder of a long division
• llrint(3) — llrintf, llrintl round to the nearest integer value using current rounding direction
• llround(3) — llroundf, llroundl round to nearest integer value
• localeconv(3) — return locale-specific information
• localtime(3) — localtime_r convert a time value to a broken-down local time
• lockf(3) — record locking on files
• log(3) — logf, logl natural logarithm function
• log10(3) — log10f, log10l base 10 logarithm function
• log1p(3) — log1pf, log1pl compute a natural logarithm
• log2(3) — log2f, log2l compute base 2 logarithm functions
• logb(3) — logbf, logbl radix-independent exponent
• logf(3) — logl natural logarithm function
• longjmp(3) — non-local goto
• lrand48(3) — generate uniformly distributed pseudo-random non-negative long integers
• lrint(3) — lrintf, lrintl round to nearest integer value using current rounding direction
• lround(3) — lroundf, lroundl round to nearest integer value
• lsearch(3) — lfind linear search and update
• lseek(3) — move the read/write file offset
• lstat(3) — get file status
• malloc(3) — a memory allocator
• mblen(3) — get number of bytes in a character
• mbrlen(3) — get number of bytes in a character (restartable)
• mbrtowc(3) — convert a character to a wide-character code (restartable)
• mbsinit(3) — determine conversion object status
• mbsrtowcs(3), mbsnrtowcs(3) — mbsrtowcs convert a character string to a wide-character string (restartable)
• mbstowcs(3) — convert a character string to a wide-character string
• mbtowc(3) — convert a character to a wide-character code
• memccpy(3) — copy bytes in memory
• memchr(3) — find byte in memory
• memcmp(3) — compare bytes in memory
• memcpy(3) — copy bytes in memory
• memmove(3) — copy bytes in memory with overlapping areas
• memset(3) — set bytes in memory
• mkdir(3) — mkdirat make a directory
• mkdtemp(3) — mkstemp create a unique directory or file
• mkfifo(3) — mkfifoat make a FIFO special file
• mknod(3) — mknodat make directory, special file, or regular file
• mkstemp(3) — create a unique file
• mktime(3) — convert broken-down time into time since the Epoch
• mlock(3) — munlock lock or unlock a range of process address space (REALTIME)
• mlockall(3) — munlockall lock/unlock the address space of a process (REALTIME)
• mmap(3) — map pages of memory
• modf(3) — modff, modfl decompose a floating-point number
• mprotect(3) — set protection of memory mapping
• mq_close(3) — close a message queue (REALTIME)
• mq_getattr(3) — get message queue attributes (REALTIME)
• mq_notify(3) — notify process that a message is available (REALTIME)
• mq_open(3) — open a message queue (REALTIME)
• mq_receive(3) — mq_timedreceive receive a message from a message queue (REALTIME)
• mq_send(3) — mq_timedsend send a message to a message queue (REALTIME)
• mq_setattr(3) — set message queue attributes (REALTIME)
• mq_timedreceive(3) — receive a message from a message queue (ADVANCED REALTIME)
• mq_timedsend(3) — send a message to a message queue (ADVANCED REALTIME)
• mq_unlink(3) — remove a message queue (REALTIME)
• mrand48(3) — generate uniformly distributed pseudo-random signed long integers
• msgctl(3) — XSI message control operations
• msgget(3) — get the XSI message queue identifier
• msgrcv(3) — XSI message receive operation
• msgsnd(3) — XSI message send operation
• msync(3) — synchronize memory with physical storage
• munlock(3) — unlock a range of process address space
• munlockall(3) — unlock the address space of a process
• munmap(3) — unmap pages of memory
• nan(3) — nanf, nanl return quiet NaN
• nanosleep(3) — high resolution sleep
• nearbyint(3) — nearbyintf, nearbyintl floating-point rounding functions
• newlocale(3) — create or modify a locale object
• nextafter(3) — nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl next representable floating-point number
• nftw(3) — walk a file tree
• nice(3) — change the nice value of a process
• nl_langinfo(3) — nl_langinfo_l language information
• nrand48(3) — generate uniformly distributed pseudo-random non-negative long integers
• ntohl(3) — ntohs convert values between host and network byte order
• open(3) — openat open file
• open_memstream(3) — open_wmemstream open a dynamic memory buffer stream
• openat(3) — open file relative to directory file descriptor
• opendir(3) — open directory associated with file descriptor
• openlog(3) — open a connection to the logging facility
• optarg(3) — opterr, optind, optopt options parsing variables
• pathconf(3) — get configurable pathname variables
• pause(3) — suspend the thread until a signal is received
• pclose(3) — close a pipe stream to or from a process
• perror(3) — write error messages to standard error
• pipe(3) — create an interprocess channel
• poll(3) — input/output multiplexing
• popen(3) — initiate pipe streams to or from a process
• posix_fadvise(3) — file advisory information (ADVANCED REALTIME)
• posix_fallocate(3) — file space control (ADVANCED REALTIME)
• posix_madvise(3) — memory advisory information and alignment control (ADVANCED REALTIME)
• posix_mem_offset(3) — find offset and length of a mapped typed memory block (ADVANCED REALTIME)
• posix_memalign(3) — aligned memory allocation (ADVANCED REALTIME)
• posix_openpt(3) — open a pseudo-terminal device
• posix_spawn(3) — posix_spawnp spawn a process (ADVANCED REALTIME)
• posix_spawn_file_actions_addclose(3) — posix_spawn_file_actions_addopen add close or open action to spawn file actions object (ADVANCED REALTIME)
• posix_spawn_file_actions_adddup2(3) — add dup2 action to spawn file actions object (ADVANCED REALTIME)
• posix_spawn_file_actions_addopen(3) — add open action to spawn file actions object (ADVANCED REALTIME)
• posix_spawn_file_actions_destroy(3) — posix_spawn_file_actions_init destroy and initialize spawn file actions object (ADVANCED REALTIME)
• posix_spawnattr_destroy(3) — posix_spawnattr_init destroy and initialize spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getflags(3) — posix_spawnattr_setflags get and set the spawn-flags attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getpgroup(3) — posix_spawnattr_setpgroup get and set the spawn-pgroup attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getschedparam(3) — posix_spawnattr_setschedparam get and set the spawn-schedparam attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getschedpolicy(3) — posix_spawnattr_setschedpolicy get and set the spawn-schedpolicy attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getsigdefault(3) — posix_spawnattr_setsigdefault get and set the spawn-sigdefault attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_getsigmask(3) — posix_spawnattr_setsigmask get and set the spawn-sigmask attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_init(3) — initialize the spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setflags(3) — set the spawn-flags attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setpgroup(3) — set the spawn-pgroup attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setschedparam(3) — set the spawn-schedparam attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setschedpolicy(3) — set the spawn-schedpolicy attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setsigdefault(3) — set the spawn-sigdefault attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnattr_setsigmask(3) — set the spawn-sigmask attribute of a spawn attributes object (ADVANCED REALTIME)
• posix_spawnp(3) — spawn a process (ADVANCED REALTIME)
• posix_trace_attr_destroy(3) — posix_trace_attr_init destroy and initialize the trace stream attributes object (TRACING)
• posix_trace_attr_getclockres(3) — posix_trace_attr_getcreatetime, posix_trace_attr_getgenversion, posix_trace_attr_getname, posix_trace_attr_setname retrieve and set information about a trace stream (TRACING)
• posix_trace_attr_getinherited(3), l(3) — posix_trace_attr_getinherited, posix_trace_attr_getlogfullpolicy, posix_trace_attr_getstreamfullpolicy, posix_trace_attr_setinherited, posix_trace_attr_setlogfullpolicy, posix_trace_attr_setstreamfullpolicy retrieve and set the behavior of a trace stream (TRACING) b
• posix_trace_attr_getlogsize(3), l(3) — posix_trace_attr_getlogsize, posix_trace_attr_getmaxdatasize, posix_trace_attr_getmaxsystemeventsize, posix_trace_attr_getmaxusereventsize, posix_trace_attr_getstreamsize, posix_trace_attr_setlogsize, posix_trace_attr_setmaxdatasize, posix_trace_attr_setstreamsize retrieve and set trace stream size attributes (TRACING) b
• posix_trace_attr_getname(3) — retrieve and set information about a trace stream (TRACING)
• posix_trace_attr_getstreamfullpolicy(3) — retrieve and set the behavior of a trace stream (TRACING)
• posix_trace_attr_getstreamsize(3) — retrieve and set trace stream size attributes (TRACING)
• posix_trace_attr_init(3) — initialize the trace stream attributes object (TRACING)
• posix_trace_attr_setinherited(3) — posix_trace_attr_setlogfullpolicy retrieve and set the behavior of a trace stream (TRACING)
• posix_trace_attr_setlogsize(3) — posix_trace_attr_setmaxdatasize retrieve and set trace stream size attributes (TRACING)
• posix_trace_attr_setname(3) — retrieve and set information about a trace stream (TRACING)
• posix_trace_attr_setstreamfullpolicy(3) — retrieve and set the behavior of a trace stream (TRACING)
• posix_trace_attr_setstreamsize(3) — retrieve and set trace stream size attributes (TRACING)
• posix_trace_clear(3) — clear trace stream and trace log (TRACING)
• posix_trace_close(3) — posix_trace_open, posix_trace_rewind trace log management (TRACING)
• posix_trace_create(3) — posix_trace_create_withlog, posix_trace_flush, posix_trace_shutdown trace stream initialization, flush, and shutdown from a process (TRACING)
• posix_trace_event(3) — posix_trace_eventid_open trace functions for instrumenting application code (TRACING)
• posix_trace_eventid_equal(3) — posix_trace_eventid_get_name, posix_trace_trid_eventid_open manipulate the trace event type identifier (TRACING)
• posix_trace_eventid_open(3) — trace functions for instrumenting application code (TRACING)
• posix_trace_eventset_add(3), l(3) — posix_trace_eventset_add, posix_trace_eventset_del, posix_trace_eventset_empty, posix_trace_eventset_fill, posix_trace_eventset_ismember manipulate trace event type sets (TRACING) b
• posix_trace_eventtypelist_getnext_id(3) — posix_trace_eventtypelist_rewind iterate over a mapping of trace event types (TRACING)
• posix_trace_flush(3) — trace stream flush from a process (TRACING)
• posix_trace_get_attr(3) — posix_trace_get_status retrieve the trace attributes or trace status (TRACING)
• posix_trace_get_filter(3) — posix_trace_set_filter retrieve and set the filter of an initialized trace stream (TRACING)
• posix_trace_get_status(3) — retrieve the trace status (TRACING)
• posix_trace_getnext_event(3) — posix_trace_timedgetnext_event, posix_trace_trygetnext_event retrieve a trace event (TRACING)
• posix_trace_open(3) — posix_trace_rewind trace log management (TRACING)
• posix_trace_set_filter(3) — set filter of an initialized trace stream (TRACING)
• posix_trace_shutdown(3) — trace stream shutdown from a process (TRACING)
• posix_trace_start(3) — posix_trace_stop trace start and stop (TRACING)
• posix_trace_timedgetnext_event(3) — retrieve a trace event (TRACING)
• posix_trace_trid_eventid_open(3) — open a trace event type identifier (TRACING)
• posix_trace_trygetnext_event(3) — retrieve a trace event (TRACING)
• posix_typed_mem_get_info(3) — query typed memory information (ADVANCED REALTIME)
• posix_typed_mem_open(3) — open a typed memory object (ADVANCED REALTIME)
• pow(3) — powf, powl power function
• pread(3) — read read from a file
• pread(3) — read from a file
• printf(3) — print formatted output
• pselect(3) — select synchronous I/O multiplexing
• psiginfo(3) — psignal write signal information to standard error
• pthread_atfork(3) — register fork handlers
• pthread_attr_destroy(3) — pthread_attr_init destroy and initialize the thread attributes object
• pthread_attr_getdetachstate(3), l(3) — pthread_attr_getdetachstate, pthread_attr_setdetachstate get and set the detachstate attribute b
• pthread_attr_getguardsize(3), l(3) — pthread_attr_getguardsize, pthread_attr_setguardsize get and set the thread guardsize attribute b
• pthread_attr_getinheritsched(3) — pthread_attr_setinheritsched get and set the inheritsched attribute (REALTIME THREADS)
• pthread_attr_getschedparam(3) — pthread_attr_setschedparam get and set the schedparam attribute
• pthread_attr_getschedpolicy(3) — pthread_attr_setschedpolicy get and set the schedpolicy attribute (REALTIME THREADS)
• pthread_attr_getscope(3) — pthread_attr_setscope get and set the contentionscope attribute (REALTIME THREADS)
• pthread_attr_getstack(3) — pthread_attr_setstack get and set stack attributes
• pthread_attr_getstacksize(3), l(3) — pthread_attr_getstacksize, pthread_attr_setstacksize get and set the stacksize attribute b
• pthread_attr_init(3) — initialize the thread attributes object
• pthread_attr_setdetachstate(3) — set the detachstate attribute
• pthread_attr_setguardsize(3) — set the thread guardsize attribute
• pthread_attr_setinheritsched(3) — set the inheritsched attribute (REALTIME THREADS)
• pthread_attr_setschedparam(3) — set the schedparam attribute
• pthread_attr_setschedpolicy(3) — set the schedpolicy attribute (REALTIME THREADS)
• pthread_attr_setscope(3) — set the contentionscope attribute (REALTIME THREADS)
• pthread_attr_setstack(3) — set the stack attribute
• pthread_attr_setstacksize(3) — set the stacksize attribute
• pthread_barrier_destroy(3) — pthread_barrier_init destroy and initialize a barrier object
• pthread_barrier_wait(3) — synchronize at a barrier
• pthread_barrierattr_destroy(3) — pthread_barrierattr_init destroy and initialize the barrier attributes object
• pthread_barrierattr_getpshared(3) — pthread_barrierattr_setpshared get and set the process-shared attribute of the barrier attributes object
• pthread_barrierattr_init(3) — initialize the barrier attributes object
• pthread_barrierattr_setpshared(3) — set the process-shared attribute of the barrier attributes object
• pthread_cancel(3) — cancel execution of a thread
• pthread_cleanup_pop(3) — pthread_cleanup_push establish cancellation handlers
• pthread_cond_broadcast(3) — pthread_cond_signal broadcast or signal a condition
• pthread_cond_destroy(3) — pthread_cond_init destroy and initialize condition variables
• pthread_cond_signal(3) — signal a condition
• pthread_cond_timedwait(3) — pthread_cond_wait wait on a condition
• pthread_condattr_destroy(3) — pthread_condattr_init destroy and initialize the condition variable attributes object
• pthread_condattr_getclock(3) — pthread_condattr_setclock get and set the clock selection condition variable attribute
• pthread_condattr_getpshared(3) — pthread_condattr_setpshared get and set the process-shared condition variable attributes
• pthread_condattr_init(3) — initialize the condition variable attributes object
• pthread_condattr_setclock(3) — set the clock selection condition variable attribute
• pthread_condattr_setpshared(3) — set the process-shared condition variable attribute
• pthread_create(3) — thread creation
• pthread_detach(3) — detach a thread
• pthread_equal(3) — compare thread IDs
• pthread_exit(3) — thread termination
• pthread_getconcurrency(3) — pthread_setconcurrency get and set the level of concurrency
• pthread_getcpuclockid(3) — access a thread CPU-time clock (ADVANCED REALTIME THREADS)
• pthread_getschedparam(3) — pthread_setschedparam dynamic thread scheduling parameters access (REALTIME THREADS)
• pthread_getspecific(3) — pthread_setspecific thread-specific data management
• pthread_join(3) — wait for thread termination
• pthread_key_create(3) — thread-specific data key creation
• pthread_key_delete(3) — thread-specific data key deletion
• pthread_kill(3) — send a signal to a thread
• pthread_mutex_consistent(3) — mark state protected by robust mutex as consistent
• pthread_mutex_destroy(3) — pthread_mutex_init destroy and initialize a mutex
• pthread_mutex_getprioceiling(3) — pthread_mutex_setprioceiling get and set the priority ceiling of a mutex (REALTIME THREADS)
• pthread_mutex_init(3) — destroy and initialize a mutex
• pthread_mutex_lock(3) — pthread_mutex_trylock, pthread_mutex_unlock lock and unlock a mutex
• pthread_mutex_setprioceiling(3) — change the priority ceiling of a mutex (REALTIME THREADS)
• pthread_mutex_timedlock(3) — lock a mutex
• pthread_mutex_trylock(3) — pthread_mutex_unlock lock and unlock a mutex
• pthread_mutexattr_destroy(3) — pthread_mutexattr_init destroy and initialize the mutex attributes object
• pthread_mutexattr_getprioceiling(3) — pthread_mutexattr_setprioceiling get and set the prioceiling attribute of the mutex attributes object (REALTIME THREADS)
• pthread_mutexattr_getprotocol(3) — pthread_mutexattr_setprotocol get and set the protocol attribute of the mutex attributes object (REALTIME THREADS)
• pthread_mutexattr_getpshared(3) — pthread_mutexattr_setpshared get and set the process-shared attribute
• pthread_mutexattr_getrobust(3) — pthread_mutexattr_setrobust get and set the mutex robust attribute
• pthread_mutexattr_gettype(3) — pthread_mutexattr_settype get and set the mutex type attribute
• pthread_mutexattr_init(3) — initialize the mutex attributes object
• pthread_mutexattr_setprioceiling(3) — set the prioceiling attribute of the mutex attributes object (REALTIME THREADS)
• pthread_mutexattr_setprotocol(3) — set the protocol attribute of the mutex attributes object (REALTIME THREADS)
• pthread_mutexattr_setpshared(3) — set the process-shared attribute
• pthread_mutexattr_setrobust(3) — get and set the mutex robust attribute
• pthread_mutexattr_settype(3) — set the mutex type attribute
• pthread_once(3) — dynamic package initialization
• pthread_rwlock_destroy(3) — pthread_rwlock_init destroy and initialize a read-write lock object
• pthread_rwlock_rdlock(3) — pthread_rwlock_tryrdlock lock a read-write lock object for reading
• pthread_rwlock_timedrdlock(3) — lock a read-write lock for reading
• pthread_rwlock_timedwrlock(3) — lock a read-write lock for writing
• pthread_rwlock_tryrdlock(3) — lock a read-write lock object for reading
• pthread_rwlock_trywrlock(3) — pthread_rwlock_wrlock lock a read-write lock object for writing
• pthread_rwlock_unlock(3) — unlock a read-write lock object
• pthread_rwlock_wrlock(3) — lock a read-write lock object for writing
• pthread_rwlockattr_destroy(3) — pthread_rwlockattr_init destroy and initialize the read-write lock attributes object
• pthread_rwlockattr_getpshared(3) — pthread_rwlockattr_setpshared get and set the process-shared attribute of the read-write lock attributes object
• pthread_rwlockattr_init(3) — initialize the read-write lock attributes object
• pthread_rwlockattr_setpshared(3) — set the process-shared attribute of the read-write lock attributes object
• pthread_self(3) — get the calling thread ID
• pthread_setcancelstate(3) — pthread_setcanceltype, pthread_testcancel set cancelability state
• pthread_setconcurrency(3) — set the level of concurrency
• pthread_setschedparam(3) — dynamic thread scheduling parameters access (REALTIME THREADS)
• pthread_setschedprio(3) — dynamic thread scheduling parameters access (REALTIME THREADS)
• pthread_setspecific(3) — thread-specific data management
• pthread_sigmask(3) — sigprocmask examine and change blocked signals
• pthread_spin_destroy(3) — pthread_spin_init destroy or initialize a spin lock object
• pthread_spin_lock(3) — pthread_spin_trylock lock a spin lock object
• pthread_spin_unlock(3) — unlock a spin lock object
• pthread_testcancel(3) — set cancelability state
• ptsname(3) — get name of the slave pseudo-terminal device
• putc(3) — put a byte on a stream
• putc_unlocked(3) — stdio with explicit client locking
• putchar(3) — put a byte on a stdout stream
• putchar_unlocked(3) — stdio with explicit client locking
• putenv(3) — change or add a value to an environment
• putmsg(3) — putpmsg send a message on a STREAM (STREAMS)
• puts(3) — put a string on standard output
• pututxline(3) — put an entry into the user accounting database
• putwc(3) — put a wide character on a stream
• putwchar(3) — put a wide character on a stdout stream
• pwrite(3) — write write on a file
• pwrite(3) — write on a file
• qsort(3) — sort a table of data
• raise(3) — send a signal to the executing process
• rand(3) — rand_r, srand pseudo-random number generator
• random(3) — generate pseudo-random number
• readdir(3) — readdir_r read a directory
• readlink(3) — readlinkat read the contents of a symbolic link
• readv(3) — read a vector
• realloc(3) — memory reallocator
• realpath(3) — resolve a pathname
• recv(3) — receive a message from a connected socket
• recvfrom(3) — receive a message from a socket
• recvmsg(3) — receive a message from a socket
• regcomp(3) — regerror, regexec, regfree regular expression matching
• remainder(3) — remainderf, remainderl remainder function
• remove(3) — remove a file
• remque(3) — remove an element from a queue
• remquo(3) — remquof, remquol remainder functions
• rename(3) — renameat rename file
• rewind(3) — reset the file position indicator in a stream
• rewinddir(3) — reset the position of a directory stream to the beginning of a directory
• rint(3) — rintf, rintl round-to-nearest integral value
• rmdir(3) — remove a directory
• round(3) — roundf, roundl round to the nearest integer value in a floating-point format
• scalbln(3) — scalblnf, scalblnl, scalbn, scalbnf, scalbnl compute exponent using FLT_RADIX
• scandir(3) — scan a directory
• scanf(3) — convert formatted input
• sched_get_priority_max(3) — sched_get_priority_min get priority limits (REALTIME)
• sched_getparam(3) — get scheduling parameters (REALTIME)
• sched_getscheduler(3) — get scheduling policy (REALTIME)
• sched_rr_get_interval(3) — get execution time limits (REALTIME)
• sched_setparam(3) — set scheduling parameters (REALTIME)
• sched_setscheduler(3) — set scheduling policy and parameters (REALTIME)
• sched_yield(3) — yield the processor
• seed48(3) — seed a uniformly distributed pseudo-random non-negative long integer generator
• seekdir(3) — set the position of a directory stream
• select(3) — synchronous I/O multiplexing
• sem_close(3) — close a named semaphore
• sem_destroy(3) — destroy an unnamed semaphore
• sem_getvalue(3) — get the value of a semaphore
• sem_init(3) — initialize an unnamed semaphore
• sem_open(3) — initialize and open a named semaphore
• sem_post(3) — unlock a semaphore
• sem_timedwait(3) — lock a semaphore
• sem_trywait(3) — sem_wait lock a semaphore
• sem_unlink(3) — remove a named semaphore
• sem_wait(3) — lock a semaphore
• semctl(3) — XSI semaphore control operations
• semget(3) — get set of XSI semaphores
• semop(3) — XSI semaphore operations
• send(3) — send a message on a socket
• sendmsg(3) — send a message on a socket using a message structure
• sendto(3) — send a message on a socket
• setbuf(3) — assign buffering to a stream
• setegid(3) — set the effective group ID
• setenv(3) — add or change environment variable
• seteuid(3) — set effective user ID
• setgid(3) — set-group-ID
• setgrent(3) — reset the group database to the first entry
• sethostent(3) — network host database functions
• setitimer(3) — set the value of an interval timer
• setjmp(3) — set jump point for a non-local goto
• setkey(3) — set encoding key (CRYPT)
• setlocale(3) — set program locale
• setlogmask(3) — set the log priority mask
• setnetent(3) — network database function
• setpgid(3) — set process group ID for job control
• setpgrp(3) — set the process group ID
• setpriority(3) — set the nice value
• setprotoent(3) — network protocol database functions
• setpwent(3) — user database function
• setregid(3) — set real and effective group IDs
• setreuid(3) — set real and effective user IDs
• setrlimit(3) — control maximum resource consumption
• setservent(3) — network services database functions
• setsid(3) — create session and set process group ID
• setsockopt(3) — set the socket options
• setstate(3) — switch pseudo-random number generator state arrays
• setuid(3) — set user ID
• setutxent(3) — reset the user accounting database to the first entry
• setvbuf(3) — assign buffering to a stream
• shm_open(3) — open a shared memory object (REALTIME)
• shm_unlink(3) — remove a shared memory object (REALTIME)
• shmat(3) — XSI shared memory attach operation
• shmctl(3) — XSI shared memory control operations
• shmdt(3) — XSI shared memory detach operation
• shmget(3) — get an XSI shared memory segment
• shutdown(3) — shut down socket send and receive operations
• sigaction(3) — examine and change a signal action
• sigaddset(3) — add a signal to a signal set
• sigaltstack(3) — set and get signal alternate stack context
• sigdelset(3) — delete a signal from a signal set
• sigemptyset(3) — initialize and empty a signal set
• sigfillset(3) — initialize and fill a signal set
• sighold(3) — sigignore, sigpause, sigrelse, sigset signal management
• siginterrupt(3) — allow signals to interrupt functions
• sigismember(3) — test for a signal in a signal set
• siglongjmp(3) — non-local goto with signal handling
• signal(3) — signal management
• signbit(3) — test sign
• signgam(3) — log gamma function
• sigpause(3) — remove a signal from the signal mask and suspend the thread
• sigpending(3) — examine pending signals
• sigprocmask(3) — examine and change blocked signals
• sigqueue(3) — queue a signal to a process
• sigrelse(3) — sigset signal management
• sigsetjmp(3) — set jump point for a non-local goto
• sigsuspend(3) — wait for a signal
• sigtimedwait(3) — sigwaitinfo wait for queued signals
• sigwait(3) — wait for queued signals
• sigwaitinfo(3) — wait for queued signals
• sin(3) — sinf, sinl sine function
• sinh(3) — sinhf, sinhl hyperbolic sine functions
• sinl(3) — sine function
• sleep(3) — suspend execution for an interval of time
• snprintf(3) — print formatted output
• sockatmark(3) — determine whether a socket is at the out-of-band mark
• socket(3) — create an endpoint for communication
• socketpair(3) — create a pair of connected sockets
• sprintf(3) — print formatted output
• sqrt(3) — sqrtf, sqrtl square root function
• srand(3) — pseudo-random number generator
• srand48(3) — seed the uniformly distributed double-precision pseudo-random number generator
• srandom(3) — seed pseudo-random number generator
• sscanf(3) — convert formatted input
• stat(3) — get file status
• statvfs(3) — get file system information
• stdin(3), stderr(3) — stdin, stdout standard I/O streams
• stpcpy(3) — copy a string and return a pointer to the end of the result
• stpcpy(3) — strcpy copy a string and return a pointer to the end of the result
• stpncpy(3) — copy fixed length string, returning a pointer to the array end
• stpncpy(3) — strncpy copy fixed length string, returning a pointer to the array end
• strcasecmp(3) — strcasecmp_l, strncasecmp, strncasecmp_l case-insensitive string comparisons
• strcat(3) — concatenate two strings
• strchr(3) — string scanning operation
• strcmp(3) — compare two strings
• strcoll(3) — strcoll_l string comparison using collating information
• strcspn(3) — get the length of a complementary substring
• strdup(3) — strndup duplicate a specific number of bytes from a string
• strerror(3) — strerror_l, strerror_r get error message string
• strfmon(3) — strfmon_l convert monetary value to a string
• strftime(3) — strftime_l convert date and time to a string
• strlen(3) — strnlen get length of fixed size string
• strncasecmp(3) — strncasecmp_l case-insensitive string comparisons
• strncat(3) — concatenate a string with part of another
• strncmp(3) — compare part of two strings
• strndup(3) — duplicate a specific number of bytes from a string
• strnlen(3) — get length of fixed size string
• strpbrk(3) — scan a string for a byte
• strptime(3) — date and time conversion
• strrchr(3) — string scanning operation
• strsignal(3) — get name of signal
• strspn(3) — get length of a substring
• strstr(3) — find a substring
• strtod(3) — strtof, strtold convert a string to a double-precision number
• strtoimax(3) — strtoumax convert string to integer type
• strtok(3) — strtok_r split string into tokens
• strtol(3) — strtoll convert a string to a long integer
• strtold(3) — convert a string to a double-precision number
• strtoll(3) — convert a string to a long integer
• strtoul(3) — strtoull convert a string to an unsigned long
• strtoumax(3) — convert a string to an integer type
• strxfrm(3) — strxfrm_l string transformation
• swab(3) — swap bytes
• swprintf(3) — print formatted wide-character output
• swscanf(3) — convert formatted wide-character input
• symlink(3) — symlinkat make a symbolic link
• sync(3) — schedule file system updates
• sysconf(3) — get configurable system variables
• syslog(3) — log a message
• system(3) — issue a command
• tan(3) — tanf, tanl tangent function
• tanh(3) — tanhf, tanhl hyperbolic tangent functions
• tanl(3) — tangent function
• tcdrain(3) — wait for transmission of output
• tcflow(3) — suspend or restart the transmission or reception of data
• tcflush(3) — flush non-transmitted output data, non-read input data, or both
• tcgetattr(3) — get the parameters associated with the terminal
• tcgetpgrp(3) — get the foreground process group ID
• tcgetsid(3) — get the process group ID for the session leader for the controlling terminal
• tcsendbreak(3) — send a break for a specific duration
• tcsetattr(3) — set the parameters associated with the terminal
• tcsetpgrp(3) — set the foreground process group ID
• tdelete(3) — tfind, tsearch, twalk manage a binary search tree
• telldir(3) — current location of a named directory stream
• tempnam(3) — create a name for a temporary file
• tfind(3) — search binary search tree
• tgamma(3) — tgammaf, tgammal compute gamma(|) function
• time(3) — get time
• timer_create(3) — create a per-process timer
• timer_delete(3) — delete a per-process timer
• timer_getoverrun(3) — timer_gettime, timer_settime per-process timers
• times(3) — get process and waited-for child process times
• timezone(3) — difference from UTC and local standard time
• tmpfile(3) — create a temporary file
• tmpnam(3) — create a name for a temporary file
• toascii(3) — translate an integer to a 7-bit ASCII character
• tolower(3) — tolower_l transliterate uppercase characters to lowercase
• toupper(3) — toupper_l transliterate lowercase characters to uppercase
• towctrans(3) — towctrans_l wide-character transliteration
• towlower(3) — towlower_l transliterate uppercase wide-character code to lowercase
• towupper(3) — towupper_l transliterate lowercase wide-character code to uppercase
• trunc(3) — truncf, truncl round to truncated integer value
• truncate(3) — truncate a file to a specified length
• truncf(3) — truncl round to truncated integer value
• tsearch(3) — search a binary search tree
• ttyname(3) — ttyname_r find the pathname of a terminal
• twalk(3) — traverse a binary search tree
• ulimit(3) — get and set process limits
• umask(3) — set and get the file mode creation mask
• uname(3) — get the name of the current system
• ungetc(3) — push byte back into input stream
• ungetwc(3) — push wide-character code back into the input stream
• unlink(3) — unlinkat remove a directory entry
• unlockpt(3) — unlock a pseudo-terminal master/slave pair
• unsetenv(3) — remove an environment variable
• uselocale(3) — use locale in current thread
• utime(3) — set file access and modification times
• utimensat(3) — utimes set file access and modification times
• va_arg(3) — va_copy, va_end, va_start handle variable argument list
• vfprintf(3), vdprintf(3) — vfprintf, vprintf, vsnprintf, vsprintf format output of a stdarg argument list
• vfscanf(3) — vscanf, vsscanf format input of a stdarg argument list
• vfwprintf(3) — vswprintf, vwprintf wide-character formatted output of a stdarg argument list
• vfwscanf(3) — vswscanf, vwscanf wide-character formatted input of a stdarg argument list
• vprintf(3) — format the output of a stdarg argument list
• vscanf(3) — format input of a stdarg argument list
• vsnprintf(3) — vsprintf format output of a stdarg argument list
• vsscanf(3) — format input of a stdarg argument list
• vswprintf(3) — wide-character formatted output of a stdarg argument list
• vswscanf(3) — wide-character formatted input of a stdarg argument list
• vwprintf(3) — wide-character formatted output of a stdarg argument list
• vwscanf(3) — wide-character formatted input of a stdarg argument list
• wait(3) — waitpid wait for a child process to stop or terminate
• waitid(3) — wait for a child process to change state
• waitpid(3) — wait for a child process to stop or terminate
• wcpcpy(3) — copy a wide-character string, returning a pointer to its end
• wcpcpy(3) — wcscpy copy a wide-character string, returning a pointer to its end
• wcpncpy(3) — copy a fixed-size wide-character string, returning a pointer to its end
• wcpncpy(3) — wcsncpy copy a fixed-size wide-character string, returning a pointer to its end
• wcrtomb(3) — convert a wide-character code to a character (restartable)
• wcscasecmp(3) — wcscasecmp_l, wcsncasecmp, wcsncasecmp_l case-insensitive wide-character string comparison
• wcscat(3) — concatenate two wide-character strings
• wcschr(3) — wide-character string scanning operation
• wcscmp(3) — compare two wide-character strings
• wcscoll(3) — wcscoll_l wide-character string comparison using collating information
• wcscspn(3) — get the length of a complementary wide substring
• wcsdup(3) — duplicate a wide-character string
• wcsftime(3) — convert date and time to a wide-character string
• wcslen(3) — wcsnlen get length of a fixed-sized wide-character string
• wcsncasecmp(3) — wcsncasecmp_l case-insensitive wide-character string comparison
• wcsncat(3) — concatenate a wide-character string with part of another
• wcsncmp(3) — compare part of two wide-character strings
• wcsnlen(3) — get length of a fixed-sized wide-character string
• wcsnrtombs(3) — convert wide-character string to multi-byte string
• wcsnrtombs(3) — wcsrtombs convert a wide-character string to a character string (restartable)
• wcspbrk(3) — scan a wide-character string for a wide-character code
• wcsrchr(3) — wide-character string scanning operation
• wcsspn(3) — get the length of a wide substring
• wcsstr(3) — find a wide-character substring
• wcstod(3) — wcstof, wcstold convert a wide-character string to a double-precision number
• wcstoimax(3) — wcstoumax convert a wide-character string to an integer type
• wcstok(3) — split a wide-character string into tokens
• wcstol(3) — wcstoll convert a wide-character string to a long integer
• wcstold(3) — convert a wide-character string to a double-precision number
• wcstoll(3) — convert a wide-character string to a long integer
• wcstombs(3) — convert a wide-character string to a character string
• wcstoul(3) — wcstoull convert a wide-character string to an unsigned long
• wcstoumax(3) — convert a wide-character string to an integer type
• wcswidth(3) — number of column positions of a wide-character string
• wcsxfrm(3) — wcsxfrm_l wide-character string transformation
• wctob(3) — wide-character to single-byte conversion
• wctomb(3) — convert a wide-character code to a character
• wctrans(3) — wctrans_l define character mapping
• wctype(3) — wctype_l define character class
• wcwidth(3) — number of column positions of a wide-character code
• wmemchr(3) — find a wide character in memory
• wmemcmp(3) — compare wide characters in memory
• wmemcpy(3) — copy wide characters in memory
• wmemmove(3) — copy wide characters in memory with overlapping areas
• wmemset(3) — set wide characters in memory
• wordexp(3) — wordfree perform word expansions
• wprintf(3) — print formatted wide-character output
• writev(3) — write a vector
• wscanf(3) — convert formatted wide-character input
• y0(3) — y1, yn Bessel functions of the second kind