diff options
Diffstat (limited to 'shell_cmds/nohup/nohup.c')
| -rw-r--r-- | shell_cmds/nohup/nohup.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/shell_cmds/nohup/nohup.c b/shell_cmds/nohup/nohup.c new file mode 100644 index 0000000..021361c --- /dev/null +++ b/shell_cmds/nohup/nohup.c @@ -0,0 +1,149 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * Portions copyright (c) 2007 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if 0 +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1989, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ +#endif +#include <sys/cdefs.h> +#ifndef __APPLE__ +__FBSDID("$FreeBSD: src/usr.bin/nohup/nohup.c,v 1.10 2003/05/03 19:44:46 obrien Exp $"); +#endif + +#include <sys/param.h> +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#ifdef __APPLE__ +#include <TargetConditionals.h> +#include <vproc.h> +#include <vproc_priv.h> +#endif + +static void dofile(void); +static void usage(void); + +#define FILENAME "nohup.out" +/* + * POSIX mandates that we exit with: + * 126 - If the utility was found, but failed to execute. + * 127 - If any other error occurred. + */ +#define EXIT_NOEXEC 126 +#define EXIT_NOTFOUND 127 +#define EXIT_MISC 127 + +int +main(int argc, char *argv[]) +{ + int exit_status; + + while (getopt(argc, argv, "") != -1) + usage(); + argc -= optind; + argv += optind; + if (argc < 1) + usage(); + + if (isatty(STDOUT_FILENO)) + dofile(); + if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) + /* may have just closed stderr */ + err(EXIT_MISC, "%s", argv[0]); + + (void)signal(SIGHUP, SIG_IGN); + +#if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) + if (_vprocmgr_detach_from_console(0) != NULL) + err(EXIT_MISC, "can't detach from console"); +#endif + execvp(*argv, argv); + exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC; + err(exit_status, "%s", argv[0]); +} + +static void +dofile(void) +{ + int fd; + char path[MAXPATHLEN]; + const char *p; + + /* + * POSIX mandates if the standard output is a terminal, the standard + * output is appended to nohup.out in the working directory. Failing + * that, it will be appended to nohup.out in the directory obtained + * from the HOME environment variable. If file creation is required, + * the mode_t is set to S_IRUSR | S_IWUSR. + */ + p = FILENAME; + fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR); + if (fd != -1) + goto dupit; + if ((p = getenv("HOME")) != NULL && *p != '\0' && + (size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) < + sizeof(path)) { + fd = open(p = path, O_RDWR | O_CREAT | O_APPEND, + S_IRUSR | S_IWUSR); + if (fd != -1) + goto dupit; + } + errx(EXIT_MISC, "can't open a nohup.out file"); + +dupit: +#ifdef __APPLE__ + (void)lseek(fd, 0L, SEEK_END); +#endif + if (dup2(fd, STDOUT_FILENO) == -1) + err(EXIT_MISC, NULL); + (void)fprintf(stderr, "appending output to %s\n", p); +} + +static void +usage(void) +{ + (void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n"); + exit(EXIT_MISC); +} |