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/* Linux fcntl syscall implementation.
Copyright (C) 2000-2020 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
<https://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 */
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