exec.c File Reference

Helper functions for spawning new processes. More...

#include <regex.h>
#include "para.h"
#include "error.h"
#include "fd.h"
#include "string.h"

Functions
int	para_exec_cmdline_pid (pid_t *pid, const char *cmdline, int *fds)
	Exec the given command. More...

Detailed Description

Helper functions for spawning new processes.

Function Documentation

para_exec_cmdline_pid()

int para_exec_cmdline_pid	(	pid_t *	pid,
		const char *	cmdline,
		int *	fds
	)

Exec the given command.

Parameters

pid	Will hold the pid of the created process upon return.
cmdline	Holds the command and its arguments, separated by spaces.
fds	A pointer to a value-result array.

This function uses fork/exec to create a new process. fds must be a pointer to three integers, corresponding to stdin, stdout and stderr respectively. It specifies how to deal with fd 0, 1, 2 in the child. The contents of fds are interpreted as follows:

 - fd[i] < 0: leave fd \a i alone.
 - fd[i] = 0: dup fd \a i to \p /dev/null.
 - fd[i] > 0: create a pipe and dup i to one end of that pipe.
 Upon return, fd[i] contains the file descriptor of the pipe.

    In any case, all unneeded file descriptors are closed.

Returns

Standard.

References create_argv().