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Diffstat (limited to 'REORG.TODO/misc/daemon.c')
| -rw-r--r-- | REORG.TODO/misc/daemon.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/REORG.TODO/misc/daemon.c b/REORG.TODO/misc/daemon.c new file mode 100644 index 0000000000..9d186b24bd --- /dev/null +++ b/REORG.TODO/misc/daemon.c @@ -0,0 +1,93 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. 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. + * 4. 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 defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <errno.h> +#include <fcntl.h> +#include <paths.h> +#include <unistd.h> +#include <sys/stat.h> + +#include <device-nrs.h> +#include <not-cancel.h> + +int +daemon (int nochdir, int noclose) +{ + int fd; + + switch (__fork()) { + case -1: + return (-1); + case 0: + break; + default: + _exit(0); + } + + if (__setsid() == -1) + return (-1); + + if (!nochdir) + (void)__chdir("/"); + + if (!noclose) { + struct stat64 st; + + if ((fd = open_not_cancel(_PATH_DEVNULL, O_RDWR, 0)) != -1 + && (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) + == 0)) { + if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0 +#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR + && (st.st_rdev + == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)) +#endif + ) { + (void)__dup2(fd, STDIN_FILENO); + (void)__dup2(fd, STDOUT_FILENO); + (void)__dup2(fd, STDERR_FILENO); + if (fd > 2) + (void)__close (fd); + } else { + /* We must set an errno value since no + function call actually failed. */ + close_not_cancel_no_status (fd); + __set_errno (ENODEV); + return -1; + } + } else { + close_not_cancel_no_status (fd); + return -1; + } + } + return (0); +} |