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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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55
libc/calls/dup3-sysv.c
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@ -16,41 +16,52 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/strace.internal.h"
#include "libc/assert.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/thread.h"
#define F_DUP2FD 10
#define F_DUP2FD_CLOEXEC 18
int32_t sys_dup3(int32_t oldfd, int32_t newfd, int flags) {
static bool once;
static bool demodernize;
int olderr, how, fd;
if (!once) {
olderr = errno;
fd = __sys_dup3(oldfd, newfd, flags);
if (fd == -1 && errno == ENOSYS) {
STRACE("demodernizing %s() due to %s", "dup3", "RHEL5:CVE-2010-3301");
demodernize = true;
once = true;
errno = olderr;
} else {
once = true;
return fd;
}
} else if (!demodernize) {
return __sys_dup3(oldfd, newfd, flags);
static struct Dup3 {
pthread_once_t once;
bool demodernize;
} g_dup3;
static void sys_dup3_test(void) {
int e = errno;
__sys_dup3(-1, -1, 0);
if ((g_dup3.demodernize = errno == ENOSYS)) {
STRACE("demodernizing %s() due to %s", "dup3", "ENOSYS");
}
if (oldfd == newfd) return einval();
if (flags & ~O_CLOEXEC) return einval();
errno = e;
}
int32_t sys_dup3(int32_t oldfd, int32_t newfd, int flags) {
int how;
_unassert(oldfd >= 0);
_unassert(newfd >= 0);
_unassert(!(flags & ~O_CLOEXEC));
if (IsFreebsd()) {
how = flags & O_CLOEXEC ? F_DUP2FD_CLOEXEC : F_DUP2FD;
if (flags & O_CLOEXEC) {
how = F_DUP2FD_CLOEXEC;
} else {
how = F_DUP2FD;
}
return __sys_fcntl(oldfd, how, newfd);
}
pthread_once(&g_dup3.once, sys_dup3_test);
if (!g_dup3.demodernize) {
return __sys_dup3(oldfd, newfd, flags);
} else {
return __fixupnewfd(sys_dup2(oldfd, newfd), flags);
}