2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/param.h>
44 static void dofile(void);
45 static void usage(void) __dead2;
47 #define FILENAME "nohup.out"
49 * POSIX mandates that we exit with:
50 * 126 - If the utility was found, but failed to execute.
51 * 127 - If any other error occurred.
53 #define EXIT_NOEXEC 126
54 #define EXIT_NOTFOUND 127
58 main(int argc, char *argv[])
62 while (getopt(argc, argv, "") != -1)
69 if (isatty(STDOUT_FILENO))
71 if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
72 /* may have just closed stderr */
73 err(EXIT_MISC, "%s", argv[0]);
75 (void)signal(SIGHUP, SIG_IGN);
78 exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
79 err(exit_status, "%s", argv[0]);
86 char path[MAXPATHLEN];
90 * POSIX mandates if the standard output is a terminal, the standard
91 * output is appended to nohup.out in the working directory. Failing
92 * that, it will be appended to nohup.out in the directory obtained
93 * from the HOME environment variable. If file creation is required,
94 * the mode_t is set to S_IRUSR | S_IWUSR.
97 fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
100 if ((p = getenv("HOME")) != NULL && *p != '\0' &&
101 (size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) <
103 fd = open(p = path, O_RDWR | O_CREAT | O_APPEND,
108 errx(EXIT_MISC, "can't open a nohup.out file");
111 if (dup2(fd, STDOUT_FILENO) == -1)
112 err(EXIT_MISC, NULL);
113 (void)fprintf(stderr, "appending output to %s\n", p);
119 (void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n");