POSIX_SPAWN_FILE_ACTIONS_ADDDUP2(3C) Standard C Library Functions
posix_spawn_file_actions_adddup2 - add dup2 action to spawn file
actions object
Standard C Library (libc, -lc)
#include <spawn.h>
int
posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
int fildes, int newfildes);
The posix_spawn_file_actions_adddup2() function adds a dup2(3C) action
to the object referenced by file_actions that causes the file
descriptor fildes to be duplicated as newfildes (as if dup2(fildes,
newfildes) had been called) when a new process is spawned using this
file actions object.
A spawn file actions object is as defined in
posix_spawn_file_actions_addclose(3C).
Upon successful completion, the posix_spawn_file_actions_adddup2()
function returns 0. Otherwise, an error number is returned to indicate
the error.
The posix_spawn_file_actions_adddup2() function will fail if:
EBADF The value specified by fildes or newfildes is
negative or greater than or equal to {OPEN_MAX}.
ENOMEM Insufficient memory exists to add to the spawn file
actions object.
The posix_spawn_file_actions_adddup2() function may fail if:
EINVAL The value specified by file_actions is invalid.
It is not considered an error for the fildes argument passed to
posix_spawn_file_actions_adddup2() to specify a file descriptor for
which the specified operation could not be performed at the time of the
call. Any such error will be detected when the associated file actions
object is later used during a posix_spawn(3C) or posix_spawnp(3C)
operation.
Standard
MT-LEVEL
MT-Safe
dup2(3C), posix_spawn(3C), posix_spawn_file_actions_addclose(3C),
posix_spawn_file_actions_destroy(3C), attributes(7), standards(7)
The posix_spawn_file_actions_adddup2() function conforms to IEEE Std
1003.1-2001 ("POSIX.1").
illumos July 4, 2026 illumos
NAME
posix_spawn_file_actions_adddup2 - add dup2 action to spawn file
actions object
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <spawn.h>
int
posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
int fildes, int newfildes);
DESCRIPTION
The posix_spawn_file_actions_adddup2() function adds a dup2(3C) action
to the object referenced by file_actions that causes the file
descriptor fildes to be duplicated as newfildes (as if dup2(fildes,
newfildes) had been called) when a new process is spawned using this
file actions object.
A spawn file actions object is as defined in
posix_spawn_file_actions_addclose(3C).
RETURN VALUES
Upon successful completion, the posix_spawn_file_actions_adddup2()
function returns 0. Otherwise, an error number is returned to indicate
the error.
ERRORS
The posix_spawn_file_actions_adddup2() function will fail if:
EBADF The value specified by fildes or newfildes is
negative or greater than or equal to {OPEN_MAX}.
ENOMEM Insufficient memory exists to add to the spawn file
actions object.
The posix_spawn_file_actions_adddup2() function may fail if:
EINVAL The value specified by file_actions is invalid.
It is not considered an error for the fildes argument passed to
posix_spawn_file_actions_adddup2() to specify a file descriptor for
which the specified operation could not be performed at the time of the
call. Any such error will be detected when the associated file actions
object is later used during a posix_spawn(3C) or posix_spawnp(3C)
operation.
INTERFACE STABILITY
Standard
MT-LEVEL
MT-Safe
SEE ALSO
dup2(3C), posix_spawn(3C), posix_spawn_file_actions_addclose(3C),
posix_spawn_file_actions_destroy(3C), attributes(7), standards(7)
STANDARDS
The posix_spawn_file_actions_adddup2() function conforms to IEEE Std
1003.1-2001 ("POSIX.1").
illumos July 4, 2026 illumos