diff options
Diffstat (limited to 'libc/misc/lock')
| -rw-r--r-- | libc/misc/lock/.indent.pro | 33 | ||||
| -rw-r--r-- | libc/misc/lock/Makefile | 44 | ||||
| -rw-r--r-- | libc/misc/lock/flock.c | 54 |
3 files changed, 131 insertions, 0 deletions
diff --git a/libc/misc/lock/.indent.pro b/libc/misc/lock/.indent.pro new file mode 100644 index 000000000..492ecf1c7 --- /dev/null +++ b/libc/misc/lock/.indent.pro @@ -0,0 +1,33 @@ +--blank-lines-after-declarations +--blank-lines-after-procedures +--break-before-boolean-operator +--no-blank-lines-after-commas +--braces-on-if-line +--braces-on-struct-decl-line +--comment-indentation25 +--declaration-comment-column25 +--no-comment-delimiters-on-blank-lines +--cuddle-else +--continuation-indentation4 +--case-indentation0 +--else-endif-column33 +--space-after-cast +--line-comments-indentation0 +--declaration-indentation1 +--dont-format-first-column-comments +--dont-format-comments +--honour-newlines +--indent-level4 +/* changed from 0 to 4 */ +--parameter-indentation4 +--line-length78 /* changed from 75 */ +--continue-at-parentheses +--no-space-after-function-call-names +--dont-break-procedure-type +--dont-star-comments +--leave-optional-blank-lines +--dont-space-special-semicolon +--tab-size4 +/* additions by Mark */ +--case-brace-indentation0 +--leave-preprocessor-space diff --git a/libc/misc/lock/Makefile b/libc/misc/lock/Makefile new file mode 100644 index 000000000..e319c11df --- /dev/null +++ b/libc/misc/lock/Makefile @@ -0,0 +1,44 @@ +# Makefile for uCLibc +# +# Copyright (C) 2000 by Lineo, inc. +# +# This program is free software; you can redistribute it and/or modify it under +# the terms of the GNU Library General Public License as published by the Free +# Software Foundation; either version 2 of the License, or (at your option) any +# later version. +# +# This program 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 General Public License for more +# details. +# +# You should have received a copy of the GNU General Public License along with +# this program; if not, write to the Free Software Foundation, Inc., 59 Temple +# Place, Suite 330, Boston, MA 02111-1307 USA +# +# Derived in part from the Linux-8086 C library, the GNU C Library, and several +# other sundry sources. Files within this library are copyright by their +# respective copyright holders. + +TOPDIR=../../ +include $(TOPDIR)Rules.mak +LIBC=$(TOPDIR)libc.a + +CSRC=flock.c +COBJS=$(patsubst %.c,%.o, $(CSRC)) +OBJS=$(COBJS) + +all: $(OBJS) $(LIBC) + +$(LIBC): ar-target + +ar-target: $(OBJS) + $(AR) $(ARFLAGS) $(LIBC) $(OBJS) + +$(COBJS): + $(CC) $(CFLAGS) $< -c $*.c -o $*.o + $(STRIPTOOL) -x -R .note -R .comment $*.o + +clean: + rm -f *.[oa] *~ core + diff --git a/libc/misc/lock/flock.c b/libc/misc/lock/flock.c new file mode 100644 index 000000000..3c1264655 --- /dev/null +++ b/libc/misc/lock/flock.c @@ -0,0 +1,54 @@ +/* Copyright (C) 1992, 1995, 1996, 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* This file implements the `flock' function in terms of the POSIX.1 `fcntl' + locking mechanism. In 4BSD, these are two incompatible locking mechanisms, + perhaps with different semantics? */ + +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/file.h> + +/* Apply or remove an advisory lock, according to OPERATION, + on the file FD refers to. */ +int flock( int fd, int operation) +{ + struct flock lbuf; + + switch (operation & ~LOCK_NB) { + case LOCK_SH: + lbuf.l_type = F_RDLCK; + break; + case LOCK_EX: + lbuf.l_type = F_WRLCK; + break; + case LOCK_UN: + lbuf.l_type = F_UNLCK; + break; + default: + errno = EINVAL; + return -1; + } + + lbuf.l_whence = SEEK_SET; + lbuf.l_start = lbuf.l_len = 0L; /* Lock the whole file. */ + + return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lbuf); +} + |