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POSIX_SPAWN_FILE_ACTI... BSD Library Functions Manual POSIX_SPAWN_FILE_ACTI... NAME posix_spawn_file_actions_init posix_spawn_file_actions_destroy -- ini-tialize initialize tialize 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 ref-erenced referenced erenced by file_actions, to an empty set of file actions for subsequent 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 col-lect collect lect 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 ref-erenced referenced erenced 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 |