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Improve system call support

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This commit is contained in:
Justine Tunney 2021-08-25 21:35:58 -07:00
parent 63b867bd2f
commit 3085ac7837
65 changed files with 900 additions and 544 deletions
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45
libc/calls/openat-sysv.c
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@ -17,28 +17,45 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/sysv/consts/f.h"
#include "libc/sysv/consts/fd.h"
#include "libc/sysv/consts/o.h"
int sys_openat(int dirfd, const char *file, int flags, unsigned mode) {
int fd, err;
err = errno;
fd = __sys_openat(dirfd, file, flags, mode);
static bool once, modernize;
int d, e, f;
/*
* RHEL5 doesn't support O_CLOEXEC
* What on earth is it doing here?
* It returns -530!
* RHEL5 doesn't support O_CLOEXEC. It's hard to test for this.
* Sometimes the system call succeeds and it just doesn't set the
* flag. Other times, it return -530 which makes no sense.
*/
if (IsLinux() && fd == -1 && errno > 255) {
errno = err;
fd = __sys_openat(dirfd, file, flags & ~O_CLOEXEC, mode);
if (fd != -1 && (flags & O_CLOEXEC)) {
__sys_fcntl(fd, F_SETFD, FD_CLOEXEC);
if (!IsLinux() || !(flags & O_CLOEXEC) || modernize) {
return __sys_openat(dirfd, file, flags, mode);
} else if (once) {
if ((d = __sys_openat(dirfd, file, flags & ~O_CLOEXEC, mode)) != -1) {
e = errno;
if (__sys_fcntl(d, F_SETFD, FD_CLOEXEC) == -1) {
errno = e;
}
}
} else {
e = errno;
if ((d = __sys_openat(dirfd, file, flags, mode)) != -1) {
if ((f = __sys_fcntl(d, F_GETFD)) != -1) {
if (f & FD_CLOEXEC) {
modernize = true;
} else {
__sys_fcntl(d, F_SETFD, FD_CLOEXEC);
}
}
errno = e;
once = true;
} else if (errno > 255) {
once = true;
return sys_openat(dirfd, file, flags, mode);
}
}
return fd;
return d;
}