blob: d8489686dc6bd48d4988d80fd99a777c94d6ad73
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* nohup - invoke a utility immune to hangups. |
| 3 | * |
| 4 | * Busybox version based on nohup specification at |
| 5 | * http://www.opengroup.org/onlinepubs/007904975/utilities/nohup.html |
| 6 | * |
| 7 | * Copyright 2006 Rob Landley <rob@landley.net> |
| 8 | * Copyright 2006 Bernhard Reutner-Fischer |
| 9 | * |
| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 11 | */ |
| 12 | //config:config NOHUP |
| 13 | //config: bool "nohup" |
| 14 | //config: default y |
| 15 | //config: help |
| 16 | //config: run a command immune to hangups, with output to a non-tty. |
| 17 | |
| 18 | //applet:IF_NOHUP(APPLET(nohup, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 19 | |
| 20 | //kbuild:lib-$(CONFIG_NOHUP) += nohup.o |
| 21 | |
| 22 | //usage:#define nohup_trivial_usage |
| 23 | //usage: "PROG ARGS" |
| 24 | //usage:#define nohup_full_usage "\n\n" |
| 25 | //usage: "Run PROG immune to hangups, with output to a non-tty" |
| 26 | //usage: |
| 27 | //usage:#define nohup_example_usage |
| 28 | //usage: "$ nohup make &" |
| 29 | |
| 30 | #include "libbb.h" |
| 31 | |
| 32 | /* Compat info: nohup (GNU coreutils 6.8) does this: |
| 33 | # nohup true |
| 34 | nohup: ignoring input and appending output to `nohup.out' |
| 35 | # nohup true 1>/dev/null |
| 36 | nohup: ignoring input and redirecting stderr to stdout |
| 37 | # nohup true 2>zz |
| 38 | # cat zz |
| 39 | nohup: ignoring input and appending output to `nohup.out' |
| 40 | # nohup true 2>zz 1>/dev/null |
| 41 | # cat zz |
| 42 | nohup: ignoring input |
| 43 | # nohup true </dev/null 1>/dev/null |
| 44 | nohup: redirecting stderr to stdout |
| 45 | # nohup true </dev/null 2>zz 1>/dev/null |
| 46 | # cat zz |
| 47 | (nothing) |
| 48 | # |
| 49 | */ |
| 50 | |
| 51 | int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 52 | int nohup_main(int argc UNUSED_PARAM, char **argv) |
| 53 | { |
| 54 | const char *nohupout; |
| 55 | char *home; |
| 56 | |
| 57 | xfunc_error_retval = 127; |
| 58 | |
| 59 | if (!argv[1]) { |
| 60 | bb_show_usage(); |
| 61 | } |
| 62 | |
| 63 | /* If stdin is a tty, detach from it. */ |
| 64 | if (isatty(STDIN_FILENO)) { |
| 65 | /* bb_error_msg("ignoring input"); */ |
| 66 | close(STDIN_FILENO); |
| 67 | xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */ |
| 68 | } |
| 69 | |
| 70 | nohupout = "nohup.out"; |
| 71 | /* Redirect stdout to nohup.out, either in "." or in "$HOME". */ |
| 72 | if (isatty(STDOUT_FILENO)) { |
| 73 | close(STDOUT_FILENO); |
| 74 | if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) { |
| 75 | home = getenv("HOME"); |
| 76 | if (home) { |
| 77 | nohupout = concat_path_file(home, nohupout); |
| 78 | xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); |
| 79 | } else { |
| 80 | xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */ |
| 81 | } |
| 82 | } |
| 83 | bb_error_msg("appending output to %s", nohupout); |
| 84 | } |
| 85 | |
| 86 | /* If we have a tty on stderr, redirect to stdout. */ |
| 87 | if (isatty(STDERR_FILENO)) { |
| 88 | /* if (stdout_wasnt_a_tty) |
| 89 | bb_error_msg("redirecting stderr to stdout"); */ |
| 90 | dup2(STDOUT_FILENO, STDERR_FILENO); |
| 91 | } |
| 92 | |
| 93 | signal(SIGHUP, SIG_IGN); |
| 94 | |
| 95 | argv++; |
| 96 | BB_EXECVP_or_die(argv); |
| 97 | } |
| 98 |