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Fix msync() flags on FreeBSD

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Justine Tunney 2023-08-21 04:15:05 -07:00
parent ebf784d4f5
commit fffcd98b0e
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GPG key ID: BE714B4575D6E328
7 changed files with 95 additions and 15 deletions
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41
test/libc/runtime/msync_test.c
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@ -16,13 +16,17 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/sysv/consts/msync.h"
#include "libc/atomic.h"
#include "libc/calls/calls.h"
#include "libc/intrin/kprintf.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/msync.h"
#include "libc/sysv/consts/prot.h"
#include "libc/testlib/testlib.h"
// msync() is a difficult function to test because it doesn't do much
TEST(msync, changeFileMappingAndExit) {
int ws;
char byte;
@ -33,6 +37,7 @@ TEST(msync, changeFileMappingAndExit) {
(map = mmap(0, 4, PROT_READ | PROT_WRITE, MAP_SHARED, 3, 0)));
if (!fork()) {
map[0] = 1;
// commenting this out will fail on openbsd
ASSERT_SYS(0, 0, msync(map, 4, MS_SYNC));
_Exit(123);
}
@ -45,3 +50,37 @@ TEST(msync, changeFileMappingAndExit) {
ASSERT_SYS(0, 0, munmap(map, 4));
ASSERT_SYS(0, 0, close(3));
}
TEST(msync, changeFileMappingAndWakeSpinLockWaiter) {
int ws;
char byte;
char *map;
atomic_char *sem = _mapshared(1);
ASSERT_SYS(0, 3, tmpfd());
ASSERT_SYS(0, 0, ftruncate(3, 1));
ASSERT_NE(MAP_FAILED,
(map = mmap(0, 1, PROT_READ | PROT_WRITE, MAP_SHARED, 3, 0)));
if (!fork()) {
// wait for other process to enter spin sem
while (*sem == 0) donothing;
// change the file mapping
map[0] = 1;
// openbsd fails with this line commented out
ASSERT_SYS(0, 0, msync(map, 1, MS_ASYNC));
// immediately wake other process
*sem = 2;
_Exit(123);
}
*sem = 1;
while (*sem == 1) donothing;
ASSERT_EQ(1, map[0]);
ASSERT_SYS(0, 1, pread(3, &byte, 1, 0));
ASSERT_EQ(1, byte);
ASSERT_EQ(1, map[0]);
ASSERT_NE(-1, wait(&ws));
ASSERT_TRUE(WIFEXITED(ws));
ASSERT_EQ(123, WEXITSTATUS(ws));
ASSERT_SYS(0, 0, munmap(map, 1));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 0, munmap(sem, 1));
}