mirror of
https://github.com/troglobit/libuev.git
synced 2026-10-01 05:22:25 +07:00
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* Multiple signals, segfault and fork() to test sub-processes.
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*
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* Copyright (c) 2015-2024 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "check.h"
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#include <err.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/user.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#define DO_SEGFAULT 1
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typedef struct {
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pid_t pid;
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int magic;
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void *ptr;
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} arg_t;
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/* Stack is not shared between parent and child, only the heap. */
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static arg_t arg = {
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.magic = 1337,
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.ptr = NULL
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};
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static int callback(arg_t *arg, int event, void *foo)
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{
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arg_t *event_arg = (arg_t *)foo;
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printf("child[%d] magic %d ptr %p, event %d event arg %p\n",
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getpid(), arg->magic, arg->ptr, event, event_arg);
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arg->magic = 7331;
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arg->ptr = &event_arg;
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/* Cause segfault! */
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#if DO_SEGFAULT == 1
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event_arg->ptr = arg->ptr;
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printf("child: segfaulting failed!\n");
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#endif
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return 42;
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}
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static void sig_cb(uev_t *w, void *cbarg, int events)
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{
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arg_t *arg = (arg_t *)cbarg;
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switch (w->signo) {
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case SIGSEGV:
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// printf("Got SIGSEGV (%d) from PID %d\n", w->siginfo.ssi_signo, w->siginfo.ssi_pid);
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warnx("PID %d caused segfault.", getpid());
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exit(-1);
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break;
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case SIGCHLD:
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if (arg->pid != (pid_t)w->siginfo.ssi_pid)
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err(1, "wrong child exited pid %d vs ssi_pid %d",
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arg->pid, w->siginfo.ssi_pid);
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warnx("Got SIGCHLD (%d), PID %d exited, bye.", w->siginfo.ssi_signo, arg->pid);
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break;
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default:
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err(1, "unhandled signal %d", w->siginfo.ssi_signo);
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}
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}
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static void work_cb(uev_t *w, void *cbarg, int events)
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{
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arg_t *arg = (arg_t *)cbarg;
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pid_t pid;
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int rc = 0;
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pid = fork();
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if (-1 == pid)
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err(1, "fork");
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if (!pid)
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exit(callback(arg, 6137, NULL));
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arg->pid = pid;
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pid = waitpid(pid, &rc, 0);
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if (pid == -1)
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err(1, "waitpid");
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if (WIFEXITED(rc))
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printf("Child %d exited normally => %d\n", pid, WEXITSTATUS(rc));
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else if (WCOREDUMP(rc))
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printf("Child %d crashed%s\n", pid, DO_SEGFAULT
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? ", as expected, everything is OK."
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: ". This should not happen!");
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else
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printf("Child %d did not exit normally!\n", pid);
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}
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static void exit_cb(uev_t *w, void *arg, int events)
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{
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printf("Process deadline reached, exiting!\n");
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uev_exit(w->ctx);
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}
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int main(void)
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{
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uev_t deadline, sigsegv, sigchld, timeout;
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uev_ctx_t ctx;
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/* Initialize libuEv */
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uev_init(&ctx);
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/* Setup callbacks */
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uev_signal_init(&ctx, &sigsegv, sig_cb, NULL, SIGSEGV);
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uev_signal_init(&ctx, &sigchld, sig_cb, &arg, SIGCHLD);
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uev_timer_init(&ctx, &timeout, work_cb, &arg, 400, 0);
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uev_timer_init(&ctx, &deadline, exit_cb, NULL, 1000, 0);
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/* Start event loop */
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return uev_run(&ctx, 0);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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