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Make important improvements

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- Fix preadv() and pwritev() for old distros
- Introduce _npassert() and _unassert() macros
- Prove that file locks work properly on Windows
- Support fcntl(F_DUPFD_CLOEXEC) on more systems
This commit is contained in:
Justine Tunney 2022-09-14 21:29:50 -07:00
parent 1ad2f530f9
commit 3f49889841
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GPG key ID: BE714B4575D6E328
130 changed files with 1225 additions and 431 deletions
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16
libc/calls/pwrite.c
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@ -19,12 +19,12 @@
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/macros.internal.h"
#include "libc/sysv/errfuns.h"
@ -46,9 +46,11 @@
ssize_t pwrite(int fd, const void *buf, size_t size, int64_t offset) {
ssize_t rc;
size_t wrote;
if (fd == -1 || offset < 0) return einval();
size = MIN(size, 0x7ffff000);
if (IsAsan() && !__asan_is_valid(buf, size)) {
if (offset < 0) {
rc = einval();
} else if (fd == -1) {
rc = ebadf();
} else if (IsAsan() && !__asan_is_valid(buf, size)) {
rc = efault();
} else if (!IsWindows()) {
rc = sys_pwrite(fd, buf, size, offset, offset);
@ -59,10 +61,10 @@ ssize_t pwrite(int fd, const void *buf, size_t size, int64_t offset) {
}
if (rc != -1) {
wrote = (size_t)rc;
if (wrote == 0) {
assert(size == 0);
if (!wrote) {
_npassert(size == 0);
} else {
assert(wrote <= size);
_npassert(wrote <= size);
}
}
DATATRACE("pwrite(%d, %#.*hhs%s, %'zu, %'zd) → %'zd% m", fd,