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/* vi: set sw=4 ts=4: */
/* nohup - invoke a utility immune to hangups.
*
* Busybox version based on nohup specification at
* http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html
*
* Copyright 2006 Rob Landley <rob@landley.net>
* Copyright 2006 Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
int nohup_main(int argc, char **argv);
int nohup_main(int argc, char **argv)
{
int nullfd;
const char *nohupout;
char *home = NULL;
xfunc_error_retval = 127;
if (argc < 2) bb_show_usage();
nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND);
/* If stdin is a tty, detach from it. */
if (isatty(STDIN_FILENO))
dup2(nullfd, STDIN_FILENO);
nohupout = "nohup.out";
/* Redirect stdout to nohup.out, either in "." or in "$HOME". */
if (isatty(STDOUT_FILENO)) {
close(STDOUT_FILENO);
if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
home = getenv("HOME");
if (home) {
nohupout = concat_path_file(home, nohupout);
xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
}
}
} else dup2(nullfd, STDOUT_FILENO);
/* If we have a tty on stderr, announce filename and redirect to stdout.
* Else redirect to /dev/null.
*/
if (isatty(STDERR_FILENO)) {
bb_error_msg("appending to %s", nohupout);
dup2(STDOUT_FILENO, STDERR_FILENO);
} else dup2(nullfd, STDERR_FILENO);
if (nullfd > 2)
close(nullfd);
signal(SIGHUP, SIG_IGN);
execvp(argv[1], argv+1);
if (ENABLE_FEATURE_CLEAN_UP && home)
free((char*)nohupout);
bb_perror_msg_and_die("%s", argv[1]);
}
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