RFIO_POPEN(3)						      Rfio Library Functions						     RFIO_POPEN(3)

NAME

       rfio_popen, rfio_pclose - start a process and open a pipe to it

SYNOPSIS

       #include <sys/types.h>
       #include "rfio_api.h"

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

       int rfio_pclose (FILE *fs);

DESCRIPTION

       rfio_popen starts a process and opens a pipe to it.

       command is a pointer to a string specifying the shell command to be executed.

       type is a mode indicator for the pipe. One of the characters "r" or "w".

       rfio_pclose waits for the forked process to terminate and returns the exit status of the command.

EXAMPLE

	    int c;
	    FILE *rf;

	    rf = rfio_popen (command, "r");
	    if (rf == NULL) {
		 rfio_perror ("rfio_popen");
		 exit (1);
	    }
	    while ((c = rfio_pread (buf, 1, sizeof(buf), rf)) > 0) {
		 ...
	    }
	    c = rfio_pclose (rf);

RETURN VALUE

       This  routine  returns NULL if the operation failed or a non-NULL pointer to a FILE structure if the operation was successful. If it fails,
       serrno variable is set appropriately.

ERRORS

       ENOMEM	    Not enough memory.

       EINVAL	    The mode provided is invalid.

       ECONNRESET   Connection reset by peer

       ETIMEDOUT    Connection timed out

       ECONNREFUSED Connection refused

       EHOSTUNREACH No route to host

       SENOSHOST    Host unknown.

       SENOSSERV    Service unknown.

       SEUMSG2LONG  Command string too long.

       SECOMERR     Communication error.

SEE ALSO

       rfio_pread(3), rfio_pwrite(3)

AUTHOR

       LCG Grid Deployment Team

LCG
							   $Date: 2008/09/24 11:25:01 $ 					     RFIO_POPEN(3)