NAME

posix_spawnattr_init posix_spawnattr_destroy — initialize or destroy a spawn attributes object

SYNOPSIS

#include <spawn.h>

int
posix_spawnattr_init(posix_spawnattr_t *attr);

int
posix_spawnattr_destroy(posix_spawnattr_t *attr);

DESCRIPTION

The posix_spawnattr_init() function initializes the object referenced by attr, to an empty set of spawn attributes for subsequent use in a call to posix_spawn(2) or posix_spawnp(2).

A posix_spawnattr_t object is an opaque type that is used to collect set of spawn attributes specified by calls to posix_spawnattr_setflags(3), posix_spawnattr_setpgroup(3), posix_spawnattr_setsigdefault(3), posix_spawnattr_setsigmask(3), posix_spawnattr_setarchpref_np(3), posix_spawnattr_setbinpref_np(3), posix_spawnattr_setspecialport_np(3), or posix_spawnattr_setexceptionports_np(3) such that once the spawn operation is complete, the child process will have a different set of attributes than the parent. The order of these operations is unspecified and may change; programs should not depend on their ordering.

The posix_spawnattr_destroy() function destroys the object referenced by attr which was previously intialized by posix_spawnattr_init(), returning any resources obtained at the time of initialization to the system for subsequent reuse. A posix_spawnattr_t may be reinitialized after having been destroyed, but must not be reused after destruction, unless it has been reinitialized.

RETURN VALUES

On success, these functions return 0; on failure they return an error number from <errno.h>.

ERRORS

The posix_spawnattr_init() and posix_spawnattr_destroy() functions will fail and return an error if:

[ENOMEM]: Insufficient resources to initialize the posix_spawnattr_t object.
[EINVAL]: The posix_spawnattr_t being destroyed is invalid.

STANDARDS

Version 3 of the Single UNIX Specification (“SUSv3”) [SPN]

HISTORY

The posix_spawn() and posix_spawnp() function calls appeared in Version 3 of the Single UNIX Specification (“SUSv3”) [SPN].