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POSIX_SPAWNATTR_SETFL... BSD Library Functions Manual POSIX_SPAWNATTR_SETFL... NAME posix_spawnattr_setflags posix_spawnattr_getflags -- get or set flags on a posix_spawnattr_t SYNOPSIS #include <spawn.h> int posix_spawnattr_setflags(posix_spawnattr_t *attr, short flags); int posix_spawnattr_getflags(const posix_spawnattr_t *restrict attr, short *restrict flags); DESCRIPTION The posix_spawnattr_setflags() function sets the flags on the attributes object referenced by attr. The posix_spawnattr_getflags() function retrieves the flags on the attributes object referenced by attr. The argument flags is either 0 or a logical OR of one or more of the fol-lowing following lowing flags: POSIX_SPAWN_RESETIDS If the set group bit is set on the process image being spawned, this bit has no effect; otherwise, if not set, the child process will inherit the effective group ID of the parent process, and if set, the child process will inherit the real group ID of the parent process. POSIX_SPAWN_SETPGROUP If this bit is not set, then the child process inherits the parent process group; if set, then the child process shall behave as if the setpgid(2) function had been called with a pid parameter of 0 and a pgid parameter equal to the value of the spawn-pgroup spawnpgroup pgroup value of the posix_spawnattr_t, as set by posix_spawnattr_setpgroup(3) POSIX_SPAWN_SETSIGDEF Signals set to to either be caught or to the default action in the parent process will also be set to the default action in the child process. Signals set to be ignored in the parent process will be ignored in the child. However, if this bit is set, then signals in the spawn-sigdefault value of the posix_spawnattr_t, as set by posix_spawnattr_setsigdefault(3) which are caught or ignored in the parent will instead be reset to their default actions in the child. POSIX_SPAWN_SETSIGMASK If this bit is set, then the initial signal mask of the child process will be set to the spawn-sigmask value of the posix_spawnattr_t, as set by posix_spawnattr_setsigmask(3). POSIX_SPAWN_SETEXEC Apple Extension: If this bit is set, rather than returning to the caller, posix_spawn(2) and posix_spawnp(2) will behave as a more featureful execve(2). POSIX_SPAWN_START_SUSPENDED Apple Extension: If this bit is set, then the child process will be created with its task suspended, permitting debuggers, pro-filers, profilers, filers, and other programs to manipulate the process before it begins execution in user space. This permits, for example, obtaining exact instruction counts, or debugging very early in dyld(1). RETURN VALUES On success, these functions return 0; on failure they return an error number from <errno.h>. The posix_spawnattr_getflags() additionally, upon successful completion, modifies the value pointed to be the attr argument by making it equal to the spawn-flags attribute of the posix_spawnattr_t. ERRORS These functions may fail if: [EINVAL] The value specified by attr is invalid. [EINVAL] The value of attr is invalid. SEE ALSO posix_spawn(2), posix_spawnp(2), posix_spawnattr_init(3), posix_spawnattr_destroy(3), posix_spawnattr_setpgroup(3), posix_spawnattr_setsigdefault(3), posix_spawnattr_setsigmask(3), setpgid(2), execve(2), dyld(1) STANDARDS Version 3 of the Single UNIX Specification (``SUSv3'') [SPN] HISTORY The posix_spawnattr_setflags() and posix_spawnattr_getflags() function calls appeared in Version 3 of the Single UNIX Specification (``SUSv3'') [SPN]. Mac OS X August 22, 2007 Mac OS X |