mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
b19e36a214
eval.c, file.c, hash.c, io.c, main.c, missing.c,
process.c, ruby.c, rubysig.h, signal.c, st.c, util.c, util.h,
bcc/Makefile.sub, win32/Makefile.sub, win32/win32.h,
ext/Win32API/Win32API.c, ext/socket/getaddrinfo.c,
ext/socket/getnameinfo.c, ext/socket/socket.c,
ext/tcltklib/stubs.c
: replace "NT" with "_WIN32", add DOSISH_DRIVE_LETTER
* wince/exe.mak : delete \r at the end of lines.
* wince/mswince-ruby17.def : delete rb_obj_become
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3148 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
134 lines
2.6 KiB
C
134 lines
2.6 KiB
C
#include "config.h"
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#if defined HAVE_FCNTL && defined HAVE_FCNTL_H
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/* These are the flock() constants. Since this sytems doesn't have
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flock(), the values of the constants are probably not available.
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*/
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# ifndef LOCK_SH
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# define LOCK_SH 1
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# endif
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# ifndef LOCK_EX
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# define LOCK_EX 2
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# endif
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# ifndef LOCK_NB
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# define LOCK_NB 4
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# endif
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# ifndef LOCK_UN
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# define LOCK_UN 8
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# endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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int
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flock(fd, operation)
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int fd;
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int operation;
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{
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struct flock lock;
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switch (operation & ~LOCK_NB) {
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case LOCK_SH:
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lock.l_type = F_RDLCK;
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break;
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case LOCK_EX:
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lock.l_type = F_WRLCK;
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break;
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case LOCK_UN:
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lock.l_type = F_UNLCK;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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lock.l_whence = SEEK_SET;
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lock.l_start = lock.l_len = 0L;
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return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lock);
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}
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#elif defined(HAVE_LOCKF)
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#include <unistd.h>
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#include <errno.h>
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/* Emulate flock() with lockf() or fcntl(). This is just to increase
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portability of scripts. The calls might not be completely
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interchangeable. What's really needed is a good file
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locking module.
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*/
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# ifndef F_ULOCK
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# define F_ULOCK 0 /* Unlock a previously locked region */
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# endif
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# ifndef F_LOCK
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# define F_LOCK 1 /* Lock a region for exclusive use */
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# endif
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# ifndef F_TLOCK
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# define F_TLOCK 2 /* Test and lock a region for exclusive use */
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# endif
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# ifndef F_TEST
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# define F_TEST 3 /* Test a region for other processes locks */
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# endif
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/* These are the flock() constants. Since this sytems doesn't have
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flock(), the values of the constants are probably not available.
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*/
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# ifndef LOCK_SH
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# define LOCK_SH 1
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# endif
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# ifndef LOCK_EX
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# define LOCK_EX 2
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# endif
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# ifndef LOCK_NB
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# define LOCK_NB 4
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# endif
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# ifndef LOCK_UN
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# define LOCK_UN 8
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# endif
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int
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flock(fd, operation)
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int fd;
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int operation;
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{
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switch (operation) {
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/* LOCK_SH - get a shared lock */
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case LOCK_SH:
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rb_notimplement();
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return -1;
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/* LOCK_EX - get an exclusive lock */
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case LOCK_EX:
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return lockf (fd, F_LOCK, 0);
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/* LOCK_SH|LOCK_NB - get a non-blocking shared lock */
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case LOCK_SH|LOCK_NB:
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rb_notimplement();
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return -1;
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/* LOCK_EX|LOCK_NB - get a non-blocking exclusive lock */
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case LOCK_EX|LOCK_NB:
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return lockf (fd, F_TLOCK, 0);
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/* LOCK_UN - unlock */
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case LOCK_UN:
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return lockf (fd, F_ULOCK, 0);
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/* Default - can't decipher operation */
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default:
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errno = EINVAL;
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return -1;
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}
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}
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#elif !defined _WIN32
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int
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flock(fd, operation)
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int fd;
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int operation;
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{
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rb_notimplement();
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return -1;
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}
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#endif
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