mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-07 19:58:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Make futexes cancellable by pthreads

Browse source
This commit is contained in:
Justine Tunney 2022-11-04 18:19:05 -07:00
parent 2278327eba
commit 022536cab6
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
101 changed files with 627 additions and 391 deletions
Download patch file Download diff file Expand all files Collapse all files

56
libc/calls/openpty.c
View file

@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/blockcancel.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/ioctl.h"
#include "libc/calls/struct/metatermios.internal.h"
@ -43,31 +44,12 @@ struct IoctlPtmGet {
char sname[16];
};
/**
* Opens new pseudo teletypewriter.
*
* @param mfd receives controlling tty rw fd on success
* @param sfd receives subordinate tty rw fd on success
* @param tio may be passed to tune a century of legacy behaviors
* @param wsz may be passed to set terminal display dimensions
* @params flags is usually O_RDWR|O_NOCTTY
* @return 0 on success, or -1 w/ errno
*/
int openpty(int *mfd, int *sfd, char *name, const struct termios *tio,
const struct winsize *wsz) {
static int openpty_impl(int *mfd, int *sfd, char *name,
const struct termios *tio, //
const struct winsize *wsz) {
int m, s, p;
union metatermios mt;
struct IoctlPtmGet t;
if (IsWindows() || IsMetal()) {
return enosys();
}
if (IsAsan() && (!__asan_is_valid(mfd, sizeof(int)) ||
!__asan_is_valid(sfd, sizeof(int)) ||
(name && !__asan_is_valid(name, 16)) ||
(tio && !__asan_is_valid(tio, sizeof(*tio))) ||
(wsz && !__asan_is_valid(wsz, sizeof(*wsz))))) {
return efault();
}
RETURN_ON_ERROR((m = posix_openpt(O_RDWR | O_NOCTTY)));
if (!IsOpenbsd()) {
RETURN_ON_ERROR(grantpt(m));
@ -90,3 +72,33 @@ OnError:
if (m != -1) sys_close(m);
return -1;
}
/**
* Opens new pseudo teletypewriter.
*
* @param mfd receives controlling tty rw fd on success
* @param sfd receives subordinate tty rw fd on success
* @param tio may be passed to tune a century of legacy behaviors
* @param wsz may be passed to set terminal display dimensions
* @params flags is usually O_RDWR|O_NOCTTY
* @return 0 on success, or -1 w/ errno
*/
int openpty(int *mfd, int *sfd, char *name, //
const struct termios *tio, //
const struct winsize *wsz) {
int rc;
if (IsWindows() || IsMetal()) {
return enosys();
}
if (IsAsan() && (!__asan_is_valid(mfd, sizeof(int)) ||
!__asan_is_valid(sfd, sizeof(int)) ||
(name && !__asan_is_valid(name, 16)) ||
(tio && !__asan_is_valid(tio, sizeof(*tio))) ||
(wsz && !__asan_is_valid(wsz, sizeof(*wsz))))) {
return efault();
}
BLOCK_CANCELLATIONS;
rc = openpty(mfd, sfd, name, tio, wsz);
ALLOW_CANCELLATIONS;
return rc;
}