Elliott Hughes | 5dec78d | 2014-02-26 15:56:23 -0800 | [diff] [blame] | 1 | #include <stdlib.h> |
| 2 | #include <stddef.h> |
| 3 | #include <unistd.h> |
| 4 | #include <signal.h> |
| 5 | #include <sys/types.h> |
| 6 | #include <sys/socket.h> |
| 7 | #include <stdio.h> |
| 8 | #include <sys/wait.h> |
| 9 | |
| 10 | static const struct sockaddr sa; |
| 11 | |
| 12 | int main(int argc, char *argv[]) |
| 13 | { |
| 14 | int loops; |
| 15 | int pid; |
| 16 | sigset_t set; |
| 17 | |
| 18 | printf( |
| 19 | "Please run me under 'strace -f -oLOG', and examine LOG file for incorrect\n" |
| 20 | "decoding of interrupted syscalls: grep for 'sendto', '??" /* anti-trigraph gap */ "?', 'unavailable'.\n" |
| 21 | "Pass number of iterations in argv[1] (default: 999).\n" |
| 22 | ); |
| 23 | fflush(NULL); |
| 24 | |
| 25 | sigemptyset(&set); |
| 26 | sigaddset(&set, SIGCHLD); |
| 27 | sigprocmask(SIG_BLOCK, &set, NULL); |
| 28 | |
| 29 | loops = 999; |
| 30 | if (argv[1]) |
| 31 | loops = atoi(argv[1]); |
| 32 | |
| 33 | while (--loops >= 0) { |
| 34 | pid = fork(); |
| 35 | |
| 36 | if (pid < 0) |
| 37 | exit(1); |
| 38 | |
| 39 | if (!pid) { |
| 40 | /* child */ |
| 41 | int child = getpid(); |
| 42 | |
| 43 | loops = 99; |
| 44 | while (--loops) { |
| 45 | pid = fork(); |
| 46 | |
| 47 | if (pid < 0) |
| 48 | exit(1); |
| 49 | |
| 50 | if (!pid) { |
| 51 | /* grandchild: kill child */ |
| 52 | kill(child, SIGKILL); |
| 53 | exit(0); |
| 54 | } |
| 55 | |
| 56 | /* Add various syscalls you want to test here. |
| 57 | * strace will decode them and suddenly find |
| 58 | * process disappearing. |
| 59 | * But leave at least one case "empty", so that |
| 60 | * "kill grandchild" happens quicker. |
| 61 | * This produces cases when strace can't even |
| 62 | * decode syscall number before process dies. |
| 63 | */ |
| 64 | switch (loops & 1) { |
| 65 | case 0: |
| 66 | break; /* intentionally empty */ |
| 67 | case 1: |
| 68 | sendto(-1, "Hello cruel world", 17, 0, &sa, sizeof(sa)); |
| 69 | break; |
| 70 | } |
| 71 | |
| 72 | /* kill grandchild */ |
| 73 | kill(pid, SIGKILL); |
| 74 | } |
| 75 | |
| 76 | exit(0); |
| 77 | } |
| 78 | |
| 79 | /* parent */ |
| 80 | wait(NULL); |
| 81 | } |
| 82 | |
| 83 | return 0; |
| 84 | } |