| 1 | /* |
| 2 | ashd - A Sane HTTP Daemon |
| 3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | #include <signal.h> |
| 24 | #include <sys/wait.h> |
| 25 | #include <time.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include <config.h> |
| 30 | #endif |
| 31 | #include <utils.h> |
| 32 | |
| 33 | static int nchildren; |
| 34 | static pid_t *children; |
| 35 | static char **chspec; |
| 36 | static volatile int done, chdone; |
| 37 | |
| 38 | static void runchild(void) |
| 39 | { |
| 40 | execvp(chspec[0], chspec); |
| 41 | fprintf(stderr, "%s: %s", chspec[0], strerror(errno)); |
| 42 | exit(127); |
| 43 | } |
| 44 | |
| 45 | static void manage(void) |
| 46 | { |
| 47 | int i, st; |
| 48 | sigset_t ss, ns; |
| 49 | pid_t ch; |
| 50 | |
| 51 | sigemptyset(&ss); |
| 52 | sigaddset(&ss, SIGCHLD); |
| 53 | sigaddset(&ss, SIGTERM); |
| 54 | sigaddset(&ss, SIGINT); |
| 55 | sigprocmask(SIG_BLOCK, &ss, &ns); |
| 56 | while(!done) { |
| 57 | for(i = 0; i < nchildren; i++) { |
| 58 | if(children[i] == 0) { |
| 59 | if((ch = fork()) < 0) |
| 60 | break; |
| 61 | if(ch == 0) |
| 62 | runchild(); |
| 63 | children[i] = ch; |
| 64 | } |
| 65 | } |
| 66 | pselect(0, NULL, NULL, NULL, NULL, &ns); |
| 67 | if(chdone) { |
| 68 | while((ch = waitpid(-1, &st, WNOHANG)) > 0) { |
| 69 | for(i = 0; i < nchildren; i++) { |
| 70 | if(children[i] == ch) |
| 71 | children[i] = 0; |
| 72 | } |
| 73 | } |
| 74 | chdone = 0; |
| 75 | } |
| 76 | } |
| 77 | sigprocmask(SIG_SETMASK, &ns, NULL); |
| 78 | } |
| 79 | |
| 80 | static void killall(void) |
| 81 | { |
| 82 | int i, try, left, st; |
| 83 | sigset_t ss, ns; |
| 84 | struct timespec to; |
| 85 | pid_t ch; |
| 86 | time_t b; |
| 87 | |
| 88 | signal(SIGINT, SIG_DFL); |
| 89 | signal(SIGTERM, SIG_DFL); |
| 90 | sigemptyset(&ss); |
| 91 | sigaddset(&ss, SIGCHLD); |
| 92 | sigprocmask(SIG_BLOCK, &ss, &ns); |
| 93 | for(try = 0; try < 2; try++) { |
| 94 | for(i = 0; i < nchildren; i++) { |
| 95 | if(children[i] != 0) |
| 96 | kill(children[i], SIGTERM); |
| 97 | } |
| 98 | b = time(NULL); |
| 99 | while(time(NULL) - b < 5) { |
| 100 | for(i = 0, left = 0; i < nchildren; i++) { |
| 101 | if(children[i] != 0) |
| 102 | left++; |
| 103 | } |
| 104 | if(!left) |
| 105 | return; |
| 106 | to.tv_sec = 1; |
| 107 | to.tv_nsec = 0; |
| 108 | pselect(0, NULL, NULL, NULL, &to, &ns); |
| 109 | if(chdone) { |
| 110 | while((ch = waitpid(-1, &st, WNOHANG)) > 0) { |
| 111 | for(i = 0; i < nchildren; i++) { |
| 112 | if(children[i] == ch) |
| 113 | children[i] = 0; |
| 114 | } |
| 115 | } |
| 116 | chdone = 0; |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | for(i = 0; i < nchildren; i++) { |
| 121 | if(children[i] != 0) |
| 122 | kill(children[i], SIGKILL); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static void chld(int sig) |
| 127 | { |
| 128 | chdone = 1; |
| 129 | } |
| 130 | |
| 131 | static void term(int sig) |
| 132 | { |
| 133 | done = 1; |
| 134 | } |
| 135 | |
| 136 | static void usage(FILE *out) |
| 137 | { |
| 138 | fprintf(out, "usage: multifscgi [-h] NUM PROGRAM [ARGS...]\n"); |
| 139 | } |
| 140 | |
| 141 | int main(int argc, char **argv) |
| 142 | { |
| 143 | int c; |
| 144 | |
| 145 | while((c = getopt(argc, argv, "h")) >= 0) { |
| 146 | switch(c) { |
| 147 | case 'h': |
| 148 | usage(stdout); |
| 149 | return(0); |
| 150 | default: |
| 151 | usage(stderr); |
| 152 | return(1); |
| 153 | } |
| 154 | } |
| 155 | if(argc - optind < 2) { |
| 156 | usage(stderr); |
| 157 | return(1); |
| 158 | } |
| 159 | nchildren = atoi(argv[optind]); |
| 160 | if(nchildren < 1) { |
| 161 | usage(stderr); |
| 162 | return(1); |
| 163 | } |
| 164 | children = szmalloc(sizeof(pid_t) * nchildren); |
| 165 | chspec = argv + optind + 1; |
| 166 | signal(SIGINT, term); |
| 167 | signal(SIGTERM, term); |
| 168 | signal(SIGCHLD, chld); |
| 169 | manage(); |
| 170 | killall(); |
| 171 | return(0); |
| 172 | } |