123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* Linux fcntl syscall implementation.
|
|
Copyright (C) 2000-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <errno.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
#ifndef __OFF_T_MATCHES_OFF64_T
|
|
|
|
# ifndef FCNTL_ADJUST_CMD
|
|
# define FCNTL_ADJUST_CMD(__cmd) __cmd
|
|
# endif
|
|
|
|
int
|
|
__libc_fcntl (int fd, int cmd, ...)
|
|
{
|
|
va_list ap;
|
|
void *arg;
|
|
|
|
va_start (ap, cmd);
|
|
arg = va_arg (ap, void *);
|
|
va_end (ap);
|
|
|
|
cmd = FCNTL_ADJUST_CMD (cmd);
|
|
|
|
switch (cmd)
|
|
{
|
|
case F_SETLKW:
|
|
case F_SETLKW64:
|
|
return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
|
|
case F_OFD_SETLKW:
|
|
{
|
|
struct flock *flk = (struct flock *) arg;
|
|
struct flock64 flk64 =
|
|
{
|
|
.l_type = flk->l_type,
|
|
.l_whence = flk->l_whence,
|
|
.l_start = flk->l_start,
|
|
.l_len = flk->l_len,
|
|
.l_pid = flk->l_pid
|
|
};
|
|
return SYSCALL_CANCEL (fcntl64, fd, cmd, &flk64);
|
|
}
|
|
case F_OFD_GETLK:
|
|
case F_OFD_SETLK:
|
|
{
|
|
struct flock *flk = (struct flock *) arg;
|
|
struct flock64 flk64 =
|
|
{
|
|
.l_type = flk->l_type,
|
|
.l_whence = flk->l_whence,
|
|
.l_start = flk->l_start,
|
|
.l_len = flk->l_len,
|
|
.l_pid = flk->l_pid
|
|
};
|
|
int ret = INLINE_SYSCALL_CALL (fcntl64, fd, cmd, &flk64);
|
|
if (ret == -1)
|
|
return -1;
|
|
if ((off_t) flk64.l_start != flk64.l_start
|
|
|| (off_t) flk64.l_len != flk64.l_len)
|
|
{
|
|
__set_errno (EOVERFLOW);
|
|
return -1;
|
|
}
|
|
flk->l_type = flk64.l_type;
|
|
flk->l_whence = flk64.l_whence;
|
|
flk->l_start = flk64.l_start;
|
|
flk->l_len = flk64.l_len;
|
|
flk->l_pid = flk64.l_pid;
|
|
return ret;
|
|
}
|
|
/* Since only F_SETLKW{64}/F_OLD_SETLK are cancellation entrypoints and
|
|
only OFD locks require LFS handling, all others flags are handled
|
|
unmodified by calling __NR_fcntl64. */
|
|
default:
|
|
return __fcntl64_nocancel_adjusted (fd, cmd, arg);
|
|
}
|
|
}
|
|
libc_hidden_def (__libc_fcntl)
|
|
|
|
weak_alias (__libc_fcntl, __fcntl)
|
|
libc_hidden_weak (__fcntl)
|
|
|
|
# include <shlib-compat.h>
|
|
# if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_28)
|
|
int
|
|
__old_libc_fcntl64 (int fd, int cmd, ...)
|
|
{
|
|
va_list ap;
|
|
void *arg;
|
|
|
|
va_start (ap, cmd);
|
|
arg = va_arg (ap, void *);
|
|
va_end (ap);
|
|
|
|
/* Previous versions called __NR_fcntl64 for fcntl (which did not handle
|
|
OFD locks in LFS mode). */
|
|
return __libc_fcntl64 (fd, cmd, arg);
|
|
}
|
|
compat_symbol (libc, __old_libc_fcntl64, fcntl, GLIBC_2_0);
|
|
versioned_symbol (libc, __libc_fcntl, fcntl, GLIBC_2_28);
|
|
# else
|
|
weak_alias (__libc_fcntl, fcntl)
|
|
# endif
|
|
|
|
#endif /* __OFF_T_MATCHES_OFF64_T */
|