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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 flags:

     POSIX_SPAWN_RESETIDS         If this bit is set, the child process will
                                  inherit the real (rather than the effective)
                                  user and group ID of the parent process.
                                  NOTE: This flag has no effect when the set-
                                  group bit is set on the process image being
                                  spawned.

     POSIX_SPAWN_SETPGROUP        If this bit is not set, then the child
                                  process inherits the parent process group;
                                  if it is set, then the child process will
                                  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 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, 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).

     POSIX_SPAWN_CLOEXEC_DEFAULT  Apple Extension: If this bit is set, then
                                  only file descriptors explicitly described
                                  by the file_actions argument are available
                                  in the spawned process; all of the other
                                  file descriptors are automatically closed in
                                  the spawned process.


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),
     posix_spawn_file_actions_init(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                       October 28, 2010                       Mac OS X

Mac OS X 10.9.1 - Generated Fri Jan 10 10:52:38 CST 2014
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