mirror of
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a7f7d1bde4
like:
src/shared/install.c: In function ‘unit_file_lookup_state’:
src/shared/install.c:1861:16: warning: ‘r’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
return r < 0 ? r : state;
^
src/shared/install.c:1796:13: note: ‘r’ was declared here
int r;
^
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <locale.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "pty.h"
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#include "util.h"
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static const char sndmsg[] = "message\n";
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static const char rcvmsg[] = "message\r\n";
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static char rcvbuf[128];
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static size_t rcvsiz = 0;
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static sd_event *event;
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static void run_child(Pty *pty) {
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ssize_t r, l;
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char buf[512];
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r = read(0, buf, sizeof(buf));
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assert_se((size_t)r == strlen(sndmsg));
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assert_se(!strncmp(buf, sndmsg, r));
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l = write(1, buf, r);
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assert_se(l == r);
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}
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static int pty_fn(Pty *pty, void *userdata, unsigned int ev, const void *ptr, size_t size) {
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switch (ev) {
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case PTY_DATA:
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assert_se(rcvsiz < strlen(rcvmsg) * 2);
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assert_se(rcvsiz + size < sizeof(rcvbuf));
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memcpy(&rcvbuf[rcvsiz], ptr, size);
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rcvsiz += size;
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if (rcvsiz >= strlen(rcvmsg) * 2) {
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assert_se(rcvsiz == strlen(rcvmsg) * 2);
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assert_se(!memcmp(rcvbuf, rcvmsg, strlen(rcvmsg)));
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assert_se(!memcmp(&rcvbuf[strlen(rcvmsg)], rcvmsg, strlen(rcvmsg)));
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}
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break;
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case PTY_HUP:
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/* This is guaranteed to appear _after_ the input queues are
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* drained! */
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assert_se(rcvsiz == strlen(rcvmsg) * 2);
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break;
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case PTY_CHILD:
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/* this may appear at any time */
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break;
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default:
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assert_se(0);
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break;
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}
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/* if we got HUP _and_ CHILD, exit */
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if (pty_get_fd(pty) < 0 && pty_get_child(pty) < 0)
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sd_event_exit(event, 0);
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return 0;
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}
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static void run_parent(Pty *pty) {
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int r;
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/* write message to pty, ECHO mode guarantees that we get it back
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* twice: once via ECHO, once from the run_child() fn */
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assert_se(pty_write(pty, sndmsg, strlen(sndmsg)) >= 0);
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r = sd_event_loop(event);
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assert_se(r >= 0);
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}
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static void test_pty(void) {
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pid_t pid;
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Pty *pty = NULL;
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rcvsiz = 0;
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zero(rcvbuf);
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assert_se(sd_event_default(&event) >= 0);
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pid = pty_fork(&pty, event, pty_fn, NULL, 80, 25);
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assert_se(pid >= 0);
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if (pid == 0) {
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/* child */
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run_child(pty);
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exit(0);
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}
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/* parent */
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run_parent(pty);
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/* Make sure the PTY recycled the child; yeah, this is racy if the
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* PID was already reused; but that seems fine for a test. */
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assert_se(waitpid(pid, NULL, WNOHANG) < 0 && errno == ECHILD);
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pty_unref(pty);
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sd_event_unref(event);
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}
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int main(int argc, char *argv[]) {
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unsigned int i;
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log_parse_environment();
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log_open();
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assert_se(sigprocmask_many(SIG_BLOCK, SIGCHLD, -1) >= 0);
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/* Oh, there're ugly races in the TTY layer regarding HUP vs IN. Turns
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* out they appear only 10% of the time. I fixed all of them and
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* don't see them, anymore. But lets be safe and run this 1000 times
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* so we catch any new ones, in case they appear again. */
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for (i = 0; i < 1000; ++i)
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test_pty();
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return 0;
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}
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