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Add some documentation

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Justine Tunney 2024-07-19 02:53:07 -07:00
parent 567d8fe32d
commit 1ff037df3c
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GPG key ID: BE714B4575D6E328
5 changed files with 177 additions and 22 deletions
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78
test/libc/intrin/mmap_test.c
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@ -22,6 +22,7 @@
#include "libc/errno.h"
#include "libc/intrin/maps.h"
#include "libc/limits.h"
#include "libc/literal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/sysconf.h"
#include "libc/stdio/rand.h"
@ -146,7 +147,6 @@ TEST(mmap, hint) {
TEST(mprotect, punchHoleAndFillHole) {
char *p;
int count = __maps.count;
int gransz = getgransize();
// obtain memory
ASSERT_NE(MAP_FAILED,
@ -223,16 +223,17 @@ TEST(mmap, testMapFile_fdGetsClosed_makesNoDifference) {
TEST(mmap, fileOffset) {
int fd;
char *map;
int offset_align = IsWindows() ? gransz : getpagesize();
ASSERT_NE(-1, (fd = open("foo", O_CREAT | O_RDWR, 0644)));
EXPECT_NE(-1, ftruncate(fd, offset_align * 2));
EXPECT_NE(-1, pwrite(fd, "hello", 5, offset_align * 0));
EXPECT_NE(-1, pwrite(fd, "there", 5, offset_align * 1));
EXPECT_NE(-1, ftruncate(fd, gransz * 2));
EXPECT_NE(-1, pwrite(fd, "hello", 5, gransz * 0));
EXPECT_NE(-1, pwrite(fd, "there", 5, gransz * 1));
EXPECT_NE(-1, fdatasync(fd));
ASSERT_NE(MAP_FAILED, (map = mmap(NULL, offset_align, PROT_READ, MAP_PRIVATE,
fd, offset_align)));
ASSERT_SYS(EINVAL, MAP_FAILED,
mmap(NULL, gransz, PROT_READ, MAP_PRIVATE, fd, gransz - 1));
ASSERT_NE(MAP_FAILED,
(map = mmap(NULL, gransz, PROT_READ, MAP_PRIVATE, fd, gransz)));
EXPECT_EQ(0, memcmp(map, "there", 5), "%#.*s", 5, map);
EXPECT_NE(-1, munmap(map, offset_align));
EXPECT_NE(-1, munmap(map, gransz));
EXPECT_NE(-1, close(fd));
}
@ -263,6 +264,67 @@ TEST(mmap, ziposCannotBeShared) {
close(fd);
}
TEST(mmap, misalignedAddr_justIgnoresIt) {
char *p;
ASSERT_NE(MAP_FAILED, (p = mmap((void *)1, 1, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)));
munmap(p, 1);
}
TEST(mmap, nullFixed_isNotAllowed) {
ASSERT_SYS(
EPERM, MAP_FAILED,
mmap(0, 1, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0));
ASSERT_SYS(EPERM, MAP_FAILED,
mmap(0, 1, PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0));
}
static int GetBitsInAddressSpace(void) {
int i;
void *ptr;
uint64_t want;
for (i = 0; i < 40; ++i) {
want = UINT64_C(0x8123000000000000) >> i;
if (want > UINTPTR_MAX)
continue;
if (msync((void *)(uintptr_t)want, 1, MS_ASYNC) == 0 || errno == EBUSY)
return 64 - i;
ptr = mmap((void *)(uintptr_t)want, 1, PROT_READ,
MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
if (ptr != MAP_FAILED) {
munmap(ptr, 1);
return 64 - i;
}
}
abort();
}
TEST(mmap, negative_isNotAllowed) {
ASSERT_SYS(ENOMEM, MAP_FAILED,
mmap((void *)-(70 * 1024 * 1024), 1, PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0));
}
TEST(mmap, pml5t) {
switch (GetBitsInAddressSpace()) {
case 56:
ASSERT_EQ((void *)0x00fff2749119c000,
mmap((void *)0x00fff2749119c000, 1, PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0));
munmap((void *)0x00fff2749119c000, 1);
break;
case 48:
ASSERT_EQ((void *)0x0000f2749119c000,
mmap((void *)0x0000f2749119c000, 1, PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0));
munmap((void *)0x0000f2749119c000, 1);
break;
default:
break;
}
}
////////////////////////////////////////////////////////////////////////////////
// zipos NON-SHARED READ-ONLY FILE MEMORY