Content-type: text/html Man page of posix_spawn_file_actions_addclose

posix_spawn_file_actions_addclose

Section: Standard C Library Functions (3C)
Updated: 30 Jan 2004
Index Return to Main Contents
 

NAME

posix_spawn_file_actions_addclose, posix_spawn_file_actions_addopen - add close or open action to spawn file actions object  

SYNOPSIS

#include <spawn.h>

int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions, int fildes, );

int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *restrict file_actions, int fildes, const char *restrict path, int oflag, mode_t mode);  

DESCRIPTION

These functions add or delete a close or open action to a spawn file actions object.

A spawn file actions object is of type posix_spawn_file_actions_t (defined in <spawn.h>) and is used to specify a series of actions to be performed by a posix_spawn(3C) or posix_spawn(3C) operation to arrive at the set of open file descriptors for the child process given the set of open file descriptors of the parent.

A spawn file actions object, when passed to posix_spawn() or posix_spawnp(), specifies how the set of open file descriptors in the calling process is transformed into a set of potentially open file descriptors for the spawned process. This transformation occurs as though the specified sequence of actions was performed exactly once, in the context of the spawned process (prior to execution of the new process image), in the order in which the actions were added to the object. Additionally, when the new process image is executed, any file descriptor (from this new set) which has its FD_CLOEXEC flag set is closed (see posix_spawn(3C)).

The posix_spawn_file_actions_addclose() function adds a close action to the object referenced by file_actions that causes the file descriptor fildes to be closed (as if close(fildes) had been called) when a new process is spawned using this file actions object.

The posix_spawn_file_actions_addopen() function adds an open action to the object referenced by file_actions that causes the file named by path to be opened (as if open(path, oflag, mode) had been called, and the returned file descriptor, if not fildes, had been changed to fildes) when a new process is spawned using this file actions object. If fildes was already an open file descriptor, it is closed before the new file is opened.

The string described by path is copied by the posix_spawn_file_actions_addopen() function.  

RETURN VALUES

Upon successful completion, these functions return 0. Otherwise, an error number is returned to indicate the error.  

ERRORS

These functions will fail if:

EBADF The value specified by fildes is negative or greater than or equal to {OPEN_MAX}.

These functions may fail if:

EINVAL The value specified by file_actions is invalid.

ENOMEM Insufficient memory exists to add to the spawn file actions object.

It is not considered an error for the fildes argument passed to these functions 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() or posix_spawnp() operation.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

close(2), dup(2), open(2), posix_spawn(3C), posix_spawn_file_actions_adddup2(3C), posix_spawn_file_actions_destroy(3C), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 02:37:27 GMT, October 02, 2010