mirror of
https://github.com/troglobit/libuev.git
synced 2026-10-13 10:04:41 +00:00
Joachim Nilsson
99ef6eb884
The __attribute__ ((unused)) is useful sometimes to declare variables as intended to be unused, e.g. in callback functions. However, they tend to clutter up the code making hard to read. We therefore remove all uses of it and instead set -Wno-unused-parameter. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* Multiple signals, segfault and fork() to test sub-processes.
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*
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* Copyright (c) 2015 Joachim Nilsson <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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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: got magic %d and ptr %p, with event %d and event arg %p\n",
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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 sigsegv_cb(uev_t *w, void *arg, int events)
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{
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warnx("PID %d caused segfault.", getpid());
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exit(-1);
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}
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static void sigchld_cb(uev_t *w, void *arg, int events)
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{
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pid_t pid = waitpid(-1, NULL, WNOHANG);
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if (-1 != pid)
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warnx("PID %d exited, bye.", pid);
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}
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static void work_cb(uev_t *w, void *arg, int events)
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{
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int status = 0;
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pid_t pid;
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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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status = callback(arg, 6137, NULL);
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exit(status);
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}
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if (waitpid(pid, &status, 0) == -1)
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err(1, "waitpid");
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if (WIFEXITED(status))
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printf("Child exited normally => %d\n", WEXITSTATUS(status));
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else if (WCOREDUMP(status))
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printf("Child crashed! %s\n", 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 did not exit normally!\n");
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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 sigsegv_watcher, sigchld_watcher, timeout_watcher, deadline_watcher;
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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_watcher, sigsegv_cb, NULL, SIGSEGV);
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uev_signal_init(&ctx, &sigchld_watcher, sigchld_cb, NULL, SIGCHLD);
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uev_timer_init(&ctx, &timeout_watcher, work_cb, &arg, 400, 0);
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uev_timer_init(&ctx, &deadline_watcher, 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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