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[apple/xnu.git] / bsd / man / man3 / posix_spawnattr_init.3

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.\"     @(#)posix_spawnattr_init.3
.
.Dd August 22, 2007
.Dt POSIX_SPAWNATTR_INIT 3
.Os "Mac OS X"
.Sh NAME
.Nm posix_spawnattr_init
.Nm posix_spawnattr_destroy
.Nd initialize or destroy a spawn attributes object
.Sh SYNOPSIS
.Fd #include <spawn.h>
.Ft int
.Fo posix_spawnattr_init
.Fa "posix_spawnattr_t *attr"
.Fc
.Ft int
.Fo posix_spawnattr_destroy
.Fa "posix_spawnattr_t *attr"
.Fc
.Sh DESCRIPTION
The
.Fn posix_spawnattr_init
function initializes the object referenced by
.Em attr ,
to an empty set of spawn attributes for subsequent use in a call to
.Xr posix_spawn 2
or
.Xr posix_spawnp 2 .
.Pp
A
.Em posix_spawnattr_t
object is an opaque type that is used to collect set of spawn attributes
specified by calls to
.Xr posix_spawnattr_setflags 3 ,
.Xr posix_spawnattr_setpgroup 3 ,
.Xr posix_spawnattr_setsigdefault 3 ,
.Xr posix_spawnattr_setsigmask 3 ,
.Xr posix_spawnattr_setbinpref_np 3 ,
.Xr posix_spawnattr_setspecialport_np 3 ,
or
.Xr 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.
.Pp
The
.Fn posix_spawnattr_destroy
function destroys the object referenced by
.Em attr 
which was previously intialized by
.Fn posix_spawnattr_init ,
returning any resources obtained at the time of initialization to the
system for subsequent reuse.  A
.Em posix_spawnattr_t
may be reinitialized after having been destroyed, but
.Em must not
be reused after destruction, unless it has been reinitialized.
.Sh RETURN VALUES
On success, these functions return 0; on failure they return an error
number from
.In errno.h .
.Sh ERRORS
The
.Fn posix_spawnattr_init
and
.Fn posix_spawnattr_destroy
functions will fail and return an error if:
.Bl -tag -width Er
.\" ==========
.It Bq Er ENOMEM
Insufficient resources to initialize the
.Fa posix_spawnattr_t
object.
.\" ==========
.It Bq Er EINVAL
The 
.Fa posix_spawnattr_t
being destroyed is invalid.
.El
.Sh SEE ALSO
.Xr posix_spawn 2 ,
.Xr posix_spawnp 2 ,
.Xr posix_spawnattr_setflags 3 ,
.Xr posix_spawnattr_setpgroup 3 ,
.Xr posix_spawnattr_setsigdefault 3 ,
.Xr posix_spawnattr_setsigmask 3 ,
.Xr posix_spawnattr_setbinpref_np 3 ,
.Xr posix_spawnattr_setspecialport_np 3 ,
.Xr posix_spawnattr_setexceptionports_np 3
.Sh STANDARDS
.St -susv3 [SPN]
.Sh HISTORY
The
.Fn posix_spawn
and
.Fn posix_spawnp
function calls appeared in
.St -susv3 [SPN] .