118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* Copyright (C) 2013-2014 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <signal.h>
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#ifndef STDIN_FILENO
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#define STDIN_FILENO 0
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO 1
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#endif
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#ifndef STDERR_FILENO
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#define STDERR_FILENO 2
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#endif
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extern char **environ;
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static void close_fd (int *fd) { if ((*fd) >= 0) close (*fd); *fd = -1; }
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int main(int argc, char *argv[]) {
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if (argc < 10) {
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// TODO: if argv > 3, assume pok[] is given, notifify parent.
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// usage() and a man-page (help2man) would not be bad, either :)
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return -1;
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}
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int pok[2];
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int pin[2];
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int pout[2];
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pok[0] = atoi(argv[1]);
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pok[1] = atoi(argv[2]);
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pin[0] = atoi(argv[3]);
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pin[1] = atoi(argv[4]);
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pout[0] = atoi(argv[5]);
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pout[1] = atoi(argv[6]);
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int stderr_mode = atoi(argv[7]);
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int nicelevel = atoi(argv[8]);
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/* vfork()ed child process - exec external process */
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close_fd(&pok[0]);
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fcntl(pok[1], F_SETFD, FD_CLOEXEC);
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close_fd(&pin[1]);
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if (pin[0] != STDIN_FILENO) {
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dup2(pin[0], STDIN_FILENO);
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}
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close_fd(&pin[0]);
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close_fd(&pout[0]);
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if (pout[1] != STDOUT_FILENO) {
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dup2(pout[1], STDOUT_FILENO);
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}
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if (stderr_mode == 2) {
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/* merge STDERR into output */
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if (pout[1] != STDERR_FILENO) {
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dup2(pout[1], STDERR_FILENO);
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}
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} else if (stderr_mode == 1) {
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/* ignore STDERR */
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close(STDERR_FILENO);
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} else {
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/* keep STDERR */
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}
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if (pout[1] != STDOUT_FILENO && pout[1] != STDERR_FILENO) {
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close_fd(&pout[1]);
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}
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if (nicelevel !=0) {
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nice(nicelevel);
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}
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/* copy current environment */
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char **envp = NULL;
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int i=0;
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envp = (char **) calloc(1, sizeof(char*));
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for (i=0;environ[i];++i) {
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envp[i] = strdup(environ[i]);
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envp = (char **) realloc(envp, (i+2) * sizeof(char*));
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}
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envp[i] = 0;
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#ifdef HAVE_SIGSET
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sigset(SIGPIPE, SIG_DFL);
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#else
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signal(SIGPIPE, SIG_DFL);
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#endif
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/* all systems go */
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execve(argv[9], &argv[9], envp);
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/* if we reach here something went wrong.. */
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char buf = 0;
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(void) write(pok[1], &buf, 1 );
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close_fd(&pok[1]);
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return -1;
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}
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