GETUID(2) System Calls Manual GETUID(2)

geteuid, getuidget user identification

#include <unistd.h>



The () function returns the real user ID of the calling process. The () function returns the effective user ID of the calling process.

The real user ID is that of the user who has invoked the program. As the effective user ID gives the process additional permissions during execution of “” mode processes, () is used to determine the real-user-id of the calling process.

The getuid() and geteuid() functions are always successful, and no return value is reserved to indicate an error.

#include <sys/types.h> #include <unistd.h>

The include file <sys/types.h> is necessary for both functions.

getgid(2), setreuid(2), compat(5)

geteuid() and getuid() functions conform to IEEE Std 1003.1-1988 (“POSIX.1”).

June 4, 1993 BSD 4