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Make futexes cancellable by pthreads

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Justine Tunney 2022-11-04 18:19:05 -07:00
parent 2278327eba
commit 022536cab6
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101 changed files with 627 additions and 391 deletions
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12
libc/stdio/getentropy.c
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@ -16,13 +16,21 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/blockcancel.internal.h"
#include "libc/stdio/rand.h"
#include "libc/sysv/consts/grnd.h"
#include "libc/sysv/errfuns.h"
/**
* Returns random seeding bytes, the XNU/OpenBSD way.
*
* @return 0 on success, or -1 w/ errno
* @raise EIO if more than 256 bytes are requested
* @see getrandom()
*/
int getentropy(void *buf, size_t size) {
return getrandom(buf, size, GRND_RANDOM);
if (size > 256) return eio();
BLOCK_CANCELLATIONS;
if (getrandom(buf, size, 0) != size) notpossible;
ALLOW_CANCELLATIONS;
return 0;
}