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Linux / Unix Command: popen
Command Library

NAME

popen, pclose - process I/O  

SYNOPSIS

#include <stdio.h>

FILE *popen(const char *command, const char *type);

int pclose(FILE *stream);  

DESCRIPTION

The popen() function opens a process by creating a pipe, forking, and invoking the shell. Since a pipe is by definition unidirectional, the type argument may specify only reading or writing, not both; the resulting stream is correspondingly read-only or write-only.

The command argument is a pointer to a null-terminated string containing a shell command line. This command is passed to /bin/sh using the -c flag; interpretation, if any, is performed by the shell. The mode argument is a pointer to a null-terminated string which must be either `r' for reading or `w' for writing.

The return value from popen() is a normal standard I/O stream in all respects save that it must be closed with pclose() rather than fclose(). Writing to such a stream writes to the standard input of the command; the command's standard output is the same as that of the process that called popen(), unless this is altered by the command itself. Conversely, reading from a ``popened'' stream reads the command's standard output, and the command's standard input is the same as that of the process that called popen.

Note that output popen streams are fully buffered by default.

The pclose function waits for the associated process to terminate and returns the exit status of the command as returned by wait4.  

RETURN VALUE

The popen function returns NULL if the fork(2) or pipe(2) calls fail, or if it cannot allocate memory.

The pclose function returns -1 if wait4 returns an error, or some other error is detected.  

ERRORS

The popen function does not set errno if memory allocation fails. If the underlying fork() or pipe() fails, errno is set appropriately. If the mode argument is invalid, and this condition is detected, errno is set to EINVAL.

If pclose() cannot obtain the child status, errno is set to ECHILD.  

CONFORMING TO

POSIX.2  

SEE ALSO

fork(2), sh(1), pipe(2), wait4(2), fflush(3), fclose(3), fopen(3), stdio(3), system(3)


Important: Use the man command (% man) to see how a command is used on your particular computer.

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