| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /*- |
| 2 | * Copyright (c) 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 4. Neither the name of the University nor the names of its contributors |
| 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #if defined(LIBC_SCCS) && !defined(lint) |
| 31 | static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; |
| 32 | #endif /* LIBC_SCCS and not lint */ |
| 33 | |
| 34 | #include <errno.h> |
| 35 | #include <fcntl.h> |
| 36 | #include <paths.h> |
| 37 | #include <unistd.h> |
| 38 | #include <sys/stat.h> |
| 39 | |
| 40 | #include <device-nrs.h> |
| 41 | #include <not-cancel.h> |
| 42 | |
| 43 | int |
| 44 | daemon(nochdir, noclose) |
| 45 | int nochdir, noclose; |
| 46 | { |
| 47 | int fd; |
| 48 | |
| 49 | switch (__fork()) { |
| 50 | case -1: |
| 51 | return (-1); |
| 52 | case 0: |
| 53 | break; |
| 54 | default: |
| 55 | _exit(0); |
| 56 | } |
| 57 | |
| 58 | if (__setsid() == -1) |
| 59 | return (-1); |
| 60 | |
| 61 | if (!nochdir) |
| 62 | (void)__chdir("/"); |
| 63 | |
| 64 | if (!noclose) { |
| 65 | struct stat64 st; |
| 66 | |
| 67 | if ((fd = open_not_cancel(_PATH_DEVNULL, O_RDWR, 0)) != -1 |
| 68 | && (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) |
| 69 | == 0)) { |
| 70 | if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0 |
| 71 | #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR |
| 72 | && (st.st_rdev |
| 73 | == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)) |
| 74 | #endif |
| 75 | ) { |
| 76 | (void)__dup2(fd, STDIN_FILENO); |
| 77 | (void)__dup2(fd, STDOUT_FILENO); |
| 78 | (void)__dup2(fd, STDERR_FILENO); |
| 79 | if (fd > 2) |
| 80 | (void)__close (fd); |
| 81 | } else { |
| 82 | /* We must set an errno value since no |
| 83 | function call actually failed. */ |
| 84 | close_not_cancel_no_status (fd); |
| 85 | __set_errno (ENODEV); |
| 86 | return -1; |
| 87 | } |
| 88 | } else { |
| 89 | close_not_cancel_no_status (fd); |
| 90 | return -1; |
| 91 | } |
| 92 | } |
| 93 | return (0); |
| 94 | } |