o5r/plan9port
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add OLOCK

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This commit is contained in:
rsc 2004-06-11 14:38:56 +00:00
parent d2ffec702e
commit e750400529
2 changed files with 20 additions and 4 deletions
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12
src/lib9/open.c
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@ -1,6 +1,7 @@
#define _GNU_SOURCE /* for Linux O_DIRECT */
#include <u.h>
#define NOPLAN9DEFINES
#include <sys/file.h>
#include <libc.h>
#ifndef O_DIRECT
#define O_DIRECT 0
@ -10,12 +11,13 @@ int
p9open(char *name, int mode)
{
int cexec, rclose;
int fd, umode;
int fd, umode, lock;
umode = mode&3;
cexec = mode&OCEXEC;
rclose = mode&ORCLOSE;
mode &= ~(3|OCEXEC|ORCLOSE);
lock = mode&OLOCK;
mode &= ~(3|OCEXEC|ORCLOSE|OLOCK);
if(mode&OTRUNC){
umode |= O_TRUNC;
mode ^= OTRUNC;
@ -30,6 +32,12 @@ p9open(char *name, int mode)
}
fd = open(name, umode);
if(fd >= 0){
if(lock){
if(flock(fd, (mode==OREAD) ? LOCK_SH : LOCK_EX) < 0){
close(fd);
return -1;
}
}
if(cexec)
fcntl(fd, F_SETFL, FD_CLOEXEC);
if(rclose)