/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/limits.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/sig.h"
#include "libc/temp.h"
#include "libc/testlib/subprocess.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/semaphore.h"
#include "libc/thread/thread.h"
#if 0 // TODO(jart): delete these stupid multi-process semaphores
char name1[PATH_MAX];
char name2[PATH_MAX];
pthread_barrier_t barrier;
void IgnoreStderr(void) {
close(2);
open("/dev/null", O_WRONLY);
}
const char *SemPath(const char *name) {
static _Thread_local char buf[PATH_MAX];
return shm_path_np(name, buf, sizeof(buf));
}
void SetUp(void) {
mktemp(strcpy(name1, "/tmp/sem_open_test.name1.XXXXXX"));
mktemp(strcpy(name2, "/tmp/sem_open_test.name2.XXXXXX"));
}
void TearDown(void) {
ASSERT_FALSE(fileexists(SemPath(name2)));
ASSERT_FALSE(fileexists(SemPath(name1)));
}
void *Worker(void *arg) {
sem_t *a, *b;
struct timespec ts;
ASSERT_NE(SEM_FAILED, (a = sem_open(name1, 0)));
EXPECT_EQ((sem_t *)arg, a);
ASSERT_NE(SEM_FAILED, (b = sem_open(name2, 0)));
if (pthread_barrier_wait(&barrier) == PTHREAD_BARRIER_SERIAL_THREAD) {
ASSERT_SYS(0, 0, sem_unlink(name1));
}
ASSERT_SYS(0, 0, clock_gettime(CLOCK_REALTIME, &ts));
ts.tv_sec += 1;
ASSERT_SYS(0, 0, sem_post(a));
ASSERT_SYS(0, 0, sem_timedwait(b, &ts));
ASSERT_SYS(0, 0, sem_close(b));
ASSERT_TRUE(testlib_memoryexists(b));
ASSERT_SYS(0, 0, sem_close(a));
ASSERT_TRUE(testlib_memoryexists(a));
return 0;
}
// 1. multiple threads opening same name must yield same address
// 2. semaphore memory is freed, when all threads have closed it
// 3. semaphore may be unlinked before it's closed, from creator
// 4. semaphore may be unlinked before it's closed, from threads
TEST(sem_open, test) {
sem_t *a, *b;
int i, r, n = 8;
pthread_t *t = gc(malloc(sizeof(pthread_t) * n));
errno = 0;
ASSERT_EQ(0, pthread_barrier_init(&barrier, 0, n));
ASSERT_NE(SEM_FAILED, (a = sem_open(name1, O_CREAT, 0644, 0)));
ASSERT_NE(SEM_FAILED, (b = sem_open(name2, O_CREAT, 0644, 0)));
ASSERT_SYS(0, 0, sem_getvalue(a, &r));
ASSERT_EQ(0, r);
ASSERT_SYS(0, 0, sem_getvalue(b, &r));
ASSERT_EQ(0, r);
for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_create(t + i, 0, Worker, a));
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_wait(a));
ASSERT_SYS(0, 0, sem_getvalue(a, &r));
ASSERT_EQ(0, r);
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_post(b));
for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_join(t[i], 0));
EXPECT_SYS(0, 0, sem_unlink(name2));
EXPECT_SYS(0, 0, sem_getvalue(b, &r));
ASSERT_EQ(0, r);
ASSERT_SYS(0, 0, sem_close(b));
ASSERT_FALSE(testlib_memoryexists(b));
ASSERT_SYS(0, 0, sem_close(a));
ASSERT_FALSE(testlib_memoryexists(a));
ASSERT_EQ(0, pthread_barrier_destroy(&barrier));
}
TEST(sem_close, withUnnamedSemaphore_isUndefinedBehavior) {
if (!IsModeDbg()) return;
sem_t sem;
ASSERT_SYS(0, 0, sem_init(&sem, 0, 0));
SPAWN(fork);
IgnoreStderr();
sem_close(&sem);
TERMS(SIGILL); // see __assert_fail
ASSERT_SYS(0, 0, sem_destroy(&sem));
}
TEST(sem_open, inheritAcrossFork1) {
sem_t *a;
ASSERT_NE(SEM_FAILED, (a = sem_open(name1, O_CREAT, 0644, 0)));
SPAWN(fork);
EXITS(0);
ASSERT_SYS(0, 0, sem_close(a));
}
TEST(sem_open, inheritAcrossFork2) {
sem_t *a, *b;
struct timespec ts;
ASSERT_SYS(0, 0, clock_gettime(CLOCK_REALTIME, &ts));
ts.tv_sec += 1;
errno = 0;
ASSERT_NE(SEM_FAILED, (a = sem_open(name1, O_CREAT, 0644, 0)));
ASSERT_SYS(0, 0, sem_unlink(name1));
ASSERT_NE(SEM_FAILED, (b = sem_open(name2, O_CREAT, 0644, 0)));
ASSERT_SYS(0, 0, sem_unlink(name2));
SPAWN(fork);
ASSERT_SYS(0, 0, sem_post(a));
ASSERT_SYS(0, 0, sem_wait(b));
PARENT();
ASSERT_SYS(0, 0, sem_wait(a));
ASSERT_SYS(0, 0, sem_post(b));
WAIT(exit, 0);
ASSERT_SYS(0, 0, sem_close(b));
ASSERT_FALSE(testlib_memoryexists(b));
ASSERT_SYS(0, 0, sem_close(a));
ASSERT_FALSE(testlib_memoryexists(a));
}
TEST(sem_open, openExistsAfterUnlink_enoent) {
sem_t *sem;
ASSERT_NE(SEM_FAILED, (sem = sem_open(name1, O_CREAT, 0644, 0)));
ASSERT_EQ(0, sem_unlink(name1));
ASSERT_EQ(SEM_FAILED, sem_open(name1, 0));
ASSERT_EQ(ENOENT, errno);
ASSERT_EQ(0, sem_close(sem));
}
TEST(sem_open, openExistsRecursive) {
sem_t *sem1, *sem2;
ASSERT_NE(SEM_FAILED, (sem1 = sem_open(name1, O_CREAT, 0644, 0)));
ASSERT_NE(SEM_FAILED, (sem2 = sem_open(name1, 0)));
ASSERT_EQ(0, sem_close(sem2));
ASSERT_EQ(0, sem_close(sem1));
}
TEST(sem_open, openExistsAfterIndependentUnlinkAndRecreate_returnsNewOne) {
sem_t *a, *b;
ASSERT_NE(SEM_FAILED, (a = sem_open(name1, O_CREAT, 0644, 0)));
SPAWN(fork);
ASSERT_EQ(0, sem_unlink(name1));
ASSERT_NE(SEM_FAILED, (b = sem_open(name1, O_CREAT, 0644, 0)));
ASSERT_NE(a, b);
ASSERT_SYS(0, 0, sem_post(a));
ASSERT_SYS(0, 0, sem_wait(b));
ASSERT_EQ(0, sem_close(b));
PARENT();
ASSERT_SYS(0, 0, sem_wait(a));
ASSERT_NE(SEM_FAILED, (b = sem_open(name1, 0)));
ASSERT_NE(a, b);
ASSERT_SYS(0, 0, sem_post(b));
ASSERT_EQ(0, sem_close(b));
WAIT(exit, 0);
ASSERT_EQ(0, sem_close(a));
}
TEST(sem_close, openTwiceCloseOnce_stillMapped) {
if (1) return;
sem_t *a, *b;
char name[] = "smXXXXXX";
ASSERT_NE(NULL, mktemp(name));
ASSERT_NE(SEM_FAILED, (a = sem_open(name, O_CREAT | O_EXCL, 0600, 0)));
ASSERT_NE(SEM_FAILED, (b = sem_open(name, 0)));
ASSERT_SYS(0, 0, sem_unlink(name));
ASSERT_SYS(0, 0, sem_close(a));
ASSERT_SYS(0, 0, sem_post(a));
ASSERT_SYS(0, 0, sem_close(b));
}
#endif