glibc/io/lockf64.c

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/* Copyright (C) 1994-2020 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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
/* lockf is a simplified interface to fcntl's locking facilities. */
int
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
__lockf64 (int fd, int cmd, off64_t len64)
{
/* lockf is always relative to the current file position. */
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
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struct flock64 fl64 = {
.l_type = F_WRLCK,
.l_whence = SEEK_CUR,
.l_len = len64,
};
/* lockf() is a cancellation point but so is fcntl() if F_SETLKW is
used. Therefore we don't have to care about cancellation here,
the fcntl() function will take care of it. */
switch (cmd)
{
case F_TEST:
/* Test the lock: return 0 if FD is unlocked or locked by this process;
return -1, set errno to EACCES, if another process holds the lock. */
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
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fl64.l_type = F_RDLCK;
if (__fcntl (fd, F_GETLK64, &fl64) < 0)
return -1;
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
if (fl64.l_type == F_UNLCK || fl64.l_pid == __getpid ())
return 0;
__set_errno (EACCES);
return -1;
case F_ULOCK:
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
fl64.l_type = F_UNLCK;
return __fcntl64 (fd, F_SETLK64, &fl64);
case F_LOCK:
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
return __fcntl64 (fd, F_SETLKW64, &fl64);
case F_TLOCK:
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
return __fcntl64 (fd, F_SETLK64, &fl64);
}
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2018-11-21 11:41:05 +00:00
__set_errno (EINVAL);
return -1;
}
io: Consolidate lockf implementation With internal fcntl64 internal (commit 06ab719d), it is possible to consolidate lockf implementation by using the LFS fcntl interface instead of using arch and system-specific implementations. For Linux, the i386 implementation is used as generic implementation by replacing the direct syscall with fcntl64 call. The LFS symbol alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid the duplicate symbol (instead of overriding the implementation with an empty file). For Hurd lockf64 semantic is changed: previous generic lockf64 implementation returned EOVERFLOW if LEN input is larger than 32-bit off_t. However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64, and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t inputs). Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu build. * io/Makefile (tests): Add tst-lockf. * io/lockf.c (lockf): Use __fcntl and only define for !__OFF_T_MATCHES_OFF64_T. * io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for __OFF_T_MATCHES_OFF64_T case. * io/tst-lockf.c: New file. * sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file. * sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
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weak_alias (__lockf64, lockf64)
#ifdef __OFF_T_MATCHES_OFF64_T
weak_alias (lockf64, lockf)
#endif