NAME
posix_spawn_file_actions_adddup2 —
add dup2 action to spawn file actions object (ADVANCED
REALTIME)
SYNOPSIS
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 shall add a dup2(3) action to the object
referenced by
file_actions
that shall cause 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(3) .
RETURN VALUE
Upon successful completion, the
posix_spawn_file_actions_adddup2 () function shall
return zero; otherwise, an error number shall be returned to indicate the
error.
ERRORS
The posix_spawn_file_actions_adddup2 ()
function shall 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 shall not be considered an error for the
fildes argument passed to the
posix_spawn_file_actions_adddup2 () function 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(3) or posix_spawnp(3)
operation.
EXAMPLES
None.
APPLICATION USAGE
The posix_spawn_file_actions_adddup2 ()
function is part of the Spawn option and need not be provided on all
implementations.
RATIONALE
Refer to the RATIONALE in posix_spawn_file_actions_addclose(3) .
FUTURE DIRECTIONS
None.
SEE ALSO
dup(3) , posix_spawn(3) , posix_spawn_file_actions_addclose(3) , posix_spawn_file_actions_destroy(3)
XBD <spawn.h>
CHANGE HISTORY
First released in Issue 6. Derived from IEEE Std 1003.1d-1999.
IEEE PASC Interpretation 1003.1 #104 is applied, noting that the [EBADF] error can apply to the newfildes argument in addition to fildes.