POSIX_SPAWN_PIPE_NP(3C)POSIX_SPAWN_PIPE_NP(3C)NAMEposix_spawn_pipe_np - spawn a process with connected pipe
SYNOPSIS
#include <spawn.h>
int posix_spawn_pipe_np(pid_t *restrict pid,
int *restrict fdp,
const char *restrict cmd,
boolean_t write,
const posix_spawn_file_actions_t *file_actions,
const posix_spawnattr_t *restrict attr);
DESCRIPTION
The posix_spawn_pipe_np() function creates a new process (child
process) to run sh -c cmd, and connects the new process's standard
input or output to a file descriptor.
The new process's environment (the environ global variable) is inher‐
ited from the current process.
The cmd argument is the string for the child shell process to execute.
If the write argument is set, the returned file descriptor will be con‐
nected to the new process's standard input, and will be opened for
writing. Otherwise, the file descriptor will be connected to the new
process's standard output, and will be opened for reading.
If file_actions is not NULL, then the file descriptors open in the
child process are those open in the calling process as modified by the
spawn file actions object pointed to by file_actions and the FD_CLOEXEC
flag of each remaining open file descriptor after the spawn file
actions have been processed. See posix_spawn(3C) for details on the
behavior of file_actions.
If attr is not NULL, then the signal mask, signal default or ignore
actions, and the effective user and group IDs for the child process are
changed as specified in the attributes object referenced by attr. See
posix_spawn(3C) for details on the behavior of attr.
All process attributes, other than those influenced by the attributes
set in the object referenced by attr as specified above or by the file
descriptor manipulations specified in file_actions appear in the new
process image as though fork() had been called to create a child
process and then a member of the exec family of functions had been
called by the child process to execute /bin/sh.
The fork handlers are not run when posix_spawn_pipe_np() is called.
RETURN VALUES
Upon successful completion, posix_spawn_pipe_np() returns the process
ID of the child process to the parent process in the variable pointed
to by a non-null pidp argument, returns the file descriptor which is
connected to the child process in the variable pointed to by a non-null
fdp argument, and returns zero as the function return value. Otherwise,
no child process is created, the value stored into the variable pointed
to by a non-null pidp and fdp is unspecified, and an error number is
returned as the function return value to indicate the error.
ERRORS
See posix_spawn(3C).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Committed │
├────────────────────┼─────────────────┤
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOexec(2), fork(2), open(2), popen(3C), posix_spawn(3C),
posix_spawn_file_actions_addclose(3C),
posix_spawn_file_actions_adddup2(3C),
posix_spawn_file_actions_addopen(3C),
posix_spawn_file_actions_destroy(3C),
posix_spawn_file_actions_init(3C), posix_spawnattr_destroy(3C),
posix_spawnattr_getflags(3C), posix_spawnattr_getpgroup(3C),
posix_spawnattr_getschedparam(3C), posix_spawnattr_getschedpolicy(3C),
posix_spawnattr_getsigdefault(3C), posix_spawnattr_getsigignore_np(3C),
posix_spawnattr_getsigmask(3C), posix_spawnattr_init(3C), posix_spaw‐
nattr_setflags(3C), posix_spawnattr_setpgroup(3C), posix_spaw‐
nattr_setschedparam(3C), posix_spawnattr_setschedpolicy(3C),
posix_spawnattr_setsigdefault(3C), posix_spawnattr_setsigignore_np(3C),
posix_spawnattr_setsigmask(3C), system(3C), wait(3C), attributes(5),
standards(5)
Oct 14, 2011 POSIX_SPAWN_PIPE_NP(3C)
