Professional Multicore Programming: Design and Implementation for C++ Developers

Name

NAME

posix_spawn_file_actions_adddup2 — add dup2 action to spawn file actions object (ADVANCED REALTIME)

SYNOPSIS

SPN #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 shall add a dup2() 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().

RETURN VALUE

Upon successful completion, 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() ...