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/*
* "$Id: util.c,v 1.1 2005/02/28 17:56:51 hofmann Exp $"
*
* flpsed program.
*
* Copyright 2005 by Johannes Hofmann
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "util.h"
FILE *
pexecvp(const char *file, char *const argv[], pid_t *pid, char *type) {
FILE *iop;
int pdes[2];
if (pipe(pdes) < 0) {
return NULL;
}
*pid = vfork();
if (*pid == -1) {
perror("vfork");
close(pdes[0]);
close(pdes[1]);
return NULL;
} else if (*pid == 0) {
/* child */
if (*type == 'r') {
close(pdes[0]);
if (pdes[1] != STDOUT_FILENO) {
dup2(pdes[1], STDOUT_FILENO);
close(pdes[1]);
}
} else {
close(pdes[1]);
if (pdes[0] != STDIN_FILENO) {
dup2(pdes[0], STDIN_FILENO);
close(pdes[0]);
}
}
execvp(file, argv);
exit(127);
} else {
/* parent */
if (*type == 'r') {
iop = fdopen(pdes[0], "r");
close(pdes[1]);
} else {
iop = fdopen(pdes[1], "w");
close(pdes[0]);
}
return iop;
}
}
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