libc/sysdeps/linux/common/openat.c

   1 /*
   2  * openat() for uClibc
   3  *
   4  * Copyright (C) 2009 Analog Devices Inc.
   5  *
   6  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   7  */
   8
   9 #include <sys/syscall.h>
  10 #include <fcntl.h>
  11 #include <stdarg.h>
  12 #include <cancel.h>
  13
  14 #ifdef __NR_openat
  15 # define __NR___syscall_openat __NR_openat
  16 static __inline__ _syscall4(int, __syscall_openat, int, fd, const char *, file, int, oflag, mode_t, mode)
  17
  18 int __openat(int fd, const char *file, int o_flag, ...)
  19 {
  20 #ifdef __NEW_THREADS
  21         int oldtype, result;
  22 #endif
  23         va_list ap;
  24         mode_t mode;
  25
  26         va_start(ap, o_flag);
  27         mode = va_arg(ap, int);
  28         va_end(ap);
  29
  30         if (SINGLE_THREAD_P)
  31                 return __syscall_openat(fd, file, o_flag, mode);
  32
  33 #ifdef __NEW_THREADS
  34         oldtype = LIBC_CANCEL_ASYNC ();
  35         result = __syscall_openat(fd, file, o_flag, mode);
  36         LIBC_CANCEL_RESET (oldtype);
  37         return result;
  38 #endif
  39 }
  40
  41 strong_alias_untyped(__openat,openat)
  42 libc_hidden_def(openat)
  43 #else
  44 /* should add emulation with open() and /proc/self/fd/ ... */
  45 #endif