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Miscellanous little test programs
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| sigset-die | |
| sigset-live |
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| all: sigset-die sigset-live | |
| sigset-die: sigset.c | |
| cc -o $@ -D DIE_ON_SIGUSR1 $< | |
| sigset-live: sigset.c | |
| cc -o $@ $< |
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| // Synopsis: | |
| // $ make | |
| // $ ./sigset-live | |
| // $ kill -USR1 (either of the pids shown) | |
| // ==> both processes survive | |
| // $ ./sigset-die | |
| // $ kill -USR1 (pid) | |
| // ==> process dies | |
| #include <pthread.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <signal.h> | |
| #include <errno.h> | |
| #include <spawn.h> | |
| #include <string.h> | |
| #include <stddef.h> | |
| char **environ; | |
| void setupsigmask() | |
| { | |
| sigset_t signal_mask; | |
| sigemptyset(&signal_mask); | |
| sigaddset(&signal_mask, SIGUSR1); | |
| pthread_sigmask(SIG_BLOCK, &signal_mask, NULL); | |
| } | |
| static void *sig_thread(void *arg) | |
| { | |
| const char *msg = arg; | |
| int s, sig; | |
| sigset_t signal_mask; | |
| sigemptyset(&signal_mask); | |
| sigaddset(&signal_mask, SIGUSR1); | |
| for (;;) { | |
| s = sigwait(&signal_mask, &sig); | |
| if (s != 0) | |
| { | |
| printf("error: %d\n", s); | |
| exit(1); | |
| } | |
| printf("%s: got signal %d\n", msg, sig); | |
| } | |
| } | |
| char *make_exe_path(char *this_exe, char *other_exe_name) | |
| { | |
| char *other_exe; | |
| ptrdiff_t dirnamelen, otherexelen; | |
| char *slash; | |
| slash = strrchr(this_exe, '/'); | |
| if (!slash) { | |
| return other_exe_name; | |
| } | |
| dirnamelen = slash - this_exe; | |
| otherexelen = strlen(other_exe_name); | |
| other_exe = malloc(dirnamelen + otherexelen + 2); | |
| memcpy(other_exe, this_exe, dirnamelen); | |
| other_exe[dirnamelen] = '/'; | |
| memcpy(&other_exe[dirnamelen+1], other_exe_name, otherexelen); | |
| other_exe[dirnamelen + 1 + otherexelen + 1] = '\0'; | |
| return other_exe; | |
| } | |
| void main(int argc, char *argv[]) | |
| { | |
| pthread_t thread; | |
| pid_t child_pid; | |
| char *child_argv[2]; | |
| char *child_exe; | |
| printf("pid: %d\n", getpid()); | |
| // When setupsigmask happens first, USR1 will not kill this process. | |
| // When the child thread is spawned first, USR1 will kill this process. | |
| #ifndef DIE_ON_SIGUSR1 | |
| setupsigmask(); | |
| #endif | |
| pthread_create(&thread, NULL, &sig_thread, "thread"); | |
| #ifdef DIE_ON_SIGUSR1 | |
| setupsigmask(); | |
| #else | |
| child_exe = make_exe_path(argv[0], "sigset-die"); | |
| child_argv[0] = child_exe; | |
| child_argv[1] = NULL; | |
| printf("(spawn %s)\n", child_exe); | |
| posix_spawnp(&child_pid, child_exe, NULL, NULL, &child_argv[0], environ); | |
| #endif | |
| pause(); | |
| } |
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