dpopen.h File Reference

Double Pipe process invocation. More...

#include <unistd.h>
#include <stdio.h>

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Functions
pid_t	dpopen (const char *command, FILE **in, FILE **out)
	Fast process invocation. More...
int	dpclose (FILE *in, FILE *out, pid_t pid)
	Conclude a fast process stream. More...

Detailed Description

Double Pipe process invocation.

Function Documentation

pid_t dpopen	(	const char *	command,
		FILE **	in,
		FILE **	out
	)

Fast process invocation.

fast_popen opens a process for execution, providing its output on a stream, just like the standard popen. However, fast_popen does not invoke the shell to interpret the command, which can be very time consuming. Thus, the command must be given as a full path, and may not include quotes, variables, or other features of the shell. (Note: there is no pipe close, we rely on SIGPIPE to kill the child.)

Parameters

command	The command string to execute.
in	A pointer to a standard I/O stream, which this function will attach to the standard input of the process.
out	A pointer to a standard I/O stream, which this function will attach to the standard input of the child process.

Returns

The process ID of the newly created process.

int dpclose	(	FILE *	in,
		FILE *	out,
		pid_t	pid
	)

Conclude a fast process stream.

Parameters

in	The standard input stream returned from dpopen.
out	The standard input stream returned from dpopen.
pid	The process ID returned from dpopen.

Returns

The exit status of the process.