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123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* Linux fcntl syscall implementation.
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Copyright (C) 2000-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fcntl.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <sysdep-cancel.h>
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#ifndef __OFF_T_MATCHES_OFF64_T
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# ifndef FCNTL_ADJUST_CMD
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# define FCNTL_ADJUST_CMD(__cmd) __cmd
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# endif
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int
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__libc_fcntl (int fd, int cmd, ...)
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{
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va_list ap;
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void *arg;
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va_start (ap, cmd);
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arg = va_arg (ap, void *);
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va_end (ap);
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cmd = FCNTL_ADJUST_CMD (cmd);
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switch (cmd)
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{
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case F_SETLKW:
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case F_SETLKW64:
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return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
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case F_OFD_SETLKW:
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{
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struct flock *flk = (struct flock *) arg;
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struct flock64 flk64 =
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{
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.l_type = flk->l_type,
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.l_whence = flk->l_whence,
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.l_start = flk->l_start,
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.l_len = flk->l_len,
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.l_pid = flk->l_pid
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};
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return SYSCALL_CANCEL (fcntl64, fd, cmd, &flk64);
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}
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case F_OFD_GETLK:
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case F_OFD_SETLK:
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{
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struct flock *flk = (struct flock *) arg;
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struct flock64 flk64 =
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{
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.l_type = flk->l_type,
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.l_whence = flk->l_whence,
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.l_start = flk->l_start,
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.l_len = flk->l_len,
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.l_pid = flk->l_pid
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};
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int ret = INLINE_SYSCALL_CALL (fcntl64, fd, cmd, &flk64);
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if (ret == -1)
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return -1;
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if ((off_t) flk64.l_start != flk64.l_start
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|| (off_t) flk64.l_len != flk64.l_len)
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{
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__set_errno (EOVERFLOW);
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return -1;
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}
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flk->l_type = flk64.l_type;
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flk->l_whence = flk64.l_whence;
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flk->l_start = flk64.l_start;
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flk->l_len = flk64.l_len;
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flk->l_pid = flk64.l_pid;
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return ret;
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}
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/* Since only F_SETLKW{64}/F_OLD_SETLK are cancellation entrypoints and
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only OFD locks require LFS handling, all others flags are handled
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unmodified by calling __NR_fcntl64. */
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default:
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return __fcntl64_nocancel_adjusted (fd, cmd, arg);
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}
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}
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libc_hidden_def (__libc_fcntl)
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weak_alias (__libc_fcntl, __fcntl)
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libc_hidden_weak (__fcntl)
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# include <shlib-compat.h>
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# if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_28)
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int
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__old_libc_fcntl64 (int fd, int cmd, ...)
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{
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va_list ap;
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void *arg;
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va_start (ap, cmd);
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arg = va_arg (ap, void *);
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va_end (ap);
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/* Previous versions called __NR_fcntl64 for fcntl (which did not handle
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OFD locks in LFS mode). */
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return __libc_fcntl64 (fd, cmd, arg);
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}
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compat_symbol (libc, __old_libc_fcntl64, fcntl, GLIBC_2_0);
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versioned_symbol (libc, __libc_fcntl, fcntl, GLIBC_2_28);
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# else
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weak_alias (__libc_fcntl, fcntl)
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# endif
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#endif /* __OFF_T_MATCHES_OFF64_T */
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