forked from pool/util-linux
91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
/*
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* setctsid.c -- execute a command in a new session and with
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* new controlling terminal
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*
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* derviated from: setctsid.c of Rick Sladkey <jrs@world.std.com>
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* In the public domain.
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*
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* Changed by Werner Fink, <werner@suse.de>
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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 <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#define xerror(n) do { int error = errno; \
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if (!isatty(fileno(stderr))) \
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syslog(LOG_ERR, n ": %s", strerror(error)); \
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else \
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errno = error, perror(n); \
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} while (0)
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int main(int argc, char *argv[])
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{
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int fd;
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struct stat buf;
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int dofork = 0;
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if (argc > 1 && !strcmp(argv[1], "-f")) {
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dofork = 1;
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argc--;
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argv++;
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}
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if (argc < 3) {
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fprintf(stderr, "usage: setctsid [-f] tty program [arg ...]\n");
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exit(1);
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}
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if (stat(argv[1], &buf) < 0) {
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perror(argv[1]);
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exit(1);
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}
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if (!(S_ISCHR(buf.st_mode))) {
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/* why do we care? */
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fprintf(stderr, "%s: not a character device\n", argv[1]);
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exit(1);
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}
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if (dofork) {
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switch (fork()) {
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case -1:
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perror("fork");
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exit(1);
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case 0:
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break;
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default:
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exit(0);
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}
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}
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if (setsid() < 0) {
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perror("setsid");
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exit(1);
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}
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if ((fd = open(argv[1], O_RDWR, 0)) < 0) {
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xerror("open");
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exit(1);
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}
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dup2(fd, fileno(stdin));
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dup2(fd, fileno(stdout));
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dup2(fd, fileno(stderr));
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if (isatty(fd)) {
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if (ioctl(fileno(stdin), TIOCSCTTY, argv[1]) < 0) {
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xerror("ioctl");
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exit(1);
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}
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}
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if (fd > fileno(stderr))
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close(fd);
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execvp(argv[2], argv + 2);
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xerror("execvp");
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exit(1);
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}
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