mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
0c5dd7b342
- Improved async signal safety of read() particularly for longjmp() - Started adding cancel cleanup handlers for locks / etc on Windows - Make /dev/tty work better particularly for uses like `foo | less` - Eagerly read console input into a linked list, so poll can signal - Fix some libc definitional bugs, which configure scripts detected
72 lines
3.5 KiB
C
72 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
|
|
╚──────────────────────────────────────────────────────────────────────────────╝
|
|
│ │
|
|
│ Musl Libc │
|
|
│ Copyright © 2005-2014 Rich Felker, et al. │
|
|
│ │
|
|
│ Permission is hereby granted, free of charge, to any person obtaining │
|
|
│ a copy of this software and associated documentation files (the │
|
|
│ "Software"), to deal in the Software without restriction, including │
|
|
│ without limitation the rights to use, copy, modify, merge, publish, │
|
|
│ distribute, sublicense, and/or sell copies of the Software, and to │
|
|
│ permit persons to whom the Software is furnished to do so, subject to │
|
|
│ the following conditions: │
|
|
│ │
|
|
│ The above copyright notice and this permission notice shall be │
|
|
│ included in all copies or substantial portions of the Software. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
|
|
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
|
|
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
|
|
│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
|
|
│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
|
|
│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
|
|
│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
|
|
│ │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "third_party/musl/lockf.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/struct/flock.h"
|
|
#include "libc/calls/weirdtypes.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/sysv/consts/f.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
asm(".ident\t\"\\n\\n\
|
|
Musl libc (MIT License)\\n\
|
|
Copyright 2005-2014 Rich Felker, et. al.\"");
|
|
asm(".include \"libc/disclaimer.inc\"");
|
|
// clang-format off
|
|
|
|
/**
|
|
* Locks file.
|
|
*
|
|
* @cancellationpoint when `op` is `F_LOCK`
|
|
*/
|
|
int lockf(int fd, int op, off_t size)
|
|
{
|
|
struct flock l = {
|
|
.l_type = F_WRLCK,
|
|
.l_whence = SEEK_CUR,
|
|
.l_len = size,
|
|
};
|
|
switch (op) {
|
|
case F_TEST:
|
|
l.l_type = F_RDLCK;
|
|
if (fcntl(fd, F_GETLK, &l) < 0)
|
|
return -1;
|
|
if (l.l_type == F_UNLCK || l.l_pid == getpid())
|
|
return 0;
|
|
return eacces();
|
|
case F_ULOCK:
|
|
l.l_type = F_UNLCK;
|
|
case F_TLOCK:
|
|
return fcntl(fd, F_SETLK, &l);
|
|
case F_LOCK:
|
|
return fcntl(fd, F_SETLKW, &l);
|
|
}
|
|
return einval();
|
|
}
|
|
|
|
__weak_reference(lockf, lockf64);
|