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Fixed child process bug and updated documentation

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Marco Cetica
2025-07-21 16:08:49 +02:00
parent f83f8f034e
commit 19a6deac95
4 changed files with 45 additions and 20 deletions
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30
wolf.c
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@@ -61,13 +61,13 @@ void helper(const char *name) {
"--no-timestamp | Disable timestamp from watchdog output\n"
"-v, --version | Show program version\n"
"-h, --help | Show this helper\n\n"
"General help with the software: https://git.marcocetica.com/marco/wolf\n"
"Project homepage: https://github.com/ceticamarco/wolf\n"
"Report bugs to: Marco Cetica(<email@marcocetica.com>)\n", name);
}
void version() {
printf("Wolf (v%s) - Configurable file watchdog for Linux platform.\n"
"Copyright (c) 2024 Marco Cetica\n"
"Copyright (c) 2024, 2025 Marco Cetica\n"
"License GPLv3+: GNU GPL version 3 or later\n\n"
"Project homepage: <https://git.marcocetica.com/marco/wolf>.\n"
"Email bug reports to: <email@marcocetica.com>.\n", VERSION);
@@ -300,13 +300,6 @@ static void get_timestamp(uint8_t *timestamp, const ssize_t timestamp_len) {
}
static void exec_command(const char *cmd) {
// Ignore SIGCHLD signals.
// This allows us to avoid blocking the parent process until the child completes
// its execution; furthermore, it allows us to prevent the creation of zombie processes
// by delegating the cleanup process to the kernel. By doing so, we lose the ability
// to check the return status of the child process.
signal(SIGCHLD, SIG_IGN);
// Execute command in a new process
pid_t pid = fork();
@@ -333,6 +326,25 @@ static void exec_command(const char *cmd) {
}
free(argv);
exit(EXIT_FAILURE);
} else { // Parent process
// Block until child exits
int status;
pid_t wpid = waitpid(pid, &status, 0);
if (wpid == -1) {
perror("waitpid");
exit(EXIT_FAILURE);
}
// Log when child process exited(normally) with an error
if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
printf("[Wolf] - Child process exited with status %d\n", WEXITSTATUS(status));
}
// Log when child process was terminated by a signal
if (WIFSIGNALED(status)) {
printf("[Wolf] - Child process wass terminated by signal %d\n", WTERMSIG(status));
}
}
}