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posix_spawn_file_actions_init(3) [osx man page]


posix_spawn_file_actions_init posix_spawn_file_actions_destroy -- initialize or destroy spawn file actions objects SYNOPSIS
#include <spawn.h> int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions); int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions); DESCRIPTION
The posix_spawn_file_actions_init() function initializes the object referenced by file_actions, to an empty set of file actions for subse- quent use in a call to posix_spawn(2) or posix_spawnp(2). A posix_spawn_file_actions_t object is an opaque type that is used to collect set of file actions specified by calls to posix_spawn_file_actions_addclose(3) and posix_spawn_file_actions_addopen(3) such that once the spawn operation is complete, the child process will have a different set of file descriptors than the parent, in the order that the operations were added to the posix_spawn_file_actions_t. Additionally, any descriptor in the parent not modified by a file action, and which has the FD_CLOEXEC flag set, will be closed in the child. The posix_spawn_file_actions_destroy() function destroys the object referenced by file_actions which was previously intialized by posix_spawn_file_actions_init(), returning any resources obtained at the time of initialization to the system for subsequent reuse. A posix_spawn_file_actions_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
These functions will fail and return an error if: [ENOMEM] Insufficient resources to initialize the posix_spawn_file_actions_t object. [EINVAL] The posix_spawn_file_actions_t being destroyed is invalid. SEE ALSO
posix_spawn(2), posix_spawnp(2), posix_spawn_file_actions_addclose(3), posix_spawn_file_actions_addopen(3), posix_spawn_file_actions_adddup2(3) STANDARDS
Version 3 of the Single UNIX Specification (``SUSv3'') [SPN] HISTORY
The posix_spawn_file_actions_init() and posix_spawn_file_actions_destroy() function calls appeared in Version 3 of the Single UNIX Specification (``SUSv3'') [SPN]. Mac OS X August 22, 2007 Mac OS X

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posix_spawn_file_actions_destroy(3C)			   Standard C Library Functions 		      posix_spawn_file_actions_destroy(3C)

posix_spawn_file_actions_destroy, posix_spawn_file_actions_init - destroy and initialize spawn file actions object SYNOPSIS
#include <spawn.h> int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions); int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions); DESCRIPTION
The posix_spawn_file_actions_destroy() function destroys the object referenced by file_actions. The object becomes, in effect, uninitial- ized. An implementation can cause posix_spawn_file_actions_destroy() to set the object referenced by file_actions to an invalid value. A destroyed spawn file actions object can be reinitialized using posix_spawn_file_actions_init(). The results of otherwise referencing the object after it has been destroyed are undefined. The posix_spawn_file_actions_init() function initializes the object referenced by file_actions to contain no file actions for posix_spawn(3C) or posix_spawnp(3C) to perform. A spawn file actions object is as defined in posix_spawn_file_actions_addclose(3C). The effect of initializing an already initialized spawn file actions object is undefined. RETURN VALUES
Upon successful completion, these functions return 0. Otherwise, an error number is returned to indicate the error. ERRORS
The posix_spawn_file_actions_init() function will fail if: ENOMEM Insufficient memory exists to initialize the spawn file actions object. The posix_spawn_file_actions_destroy() function will may if: EINVAL The value specified by file_actions is invalid. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
posix_spawn(3C), posix_spawn_file_actions_addclose(3C), attributes(5), standards(5) SunOS 5.10 30 Jan 2004 posix_spawn_file_actions_destroy(3C)
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