1 #define _GNU_SOURCE	/* for Linux O_DIRECT */
2 #include <u.h>
3 #define NOPLAN9DEFINES
4 #include <sys/file.h>
5 #include <libc.h>
6 #ifndef O_DIRECT
7 #define O_DIRECT 0
8 #endif
9 
10 int
11 p9open(char *name, int mode)
12 {
13 	int cexec, rclose;
14 	int fd, umode, lock, rdwr;
15 
16 	rdwr = mode&3;
17 	umode = rdwr;
18 	cexec = mode&OCEXEC;
19 	rclose = mode&ORCLOSE;
20 	lock = mode&OLOCK;
21 	mode &= ~(3|OCEXEC|ORCLOSE|OLOCK);
22 	if(mode&OTRUNC){
23 		umode |= O_TRUNC;
24 		mode ^= OTRUNC;
25 	}
26 	if(mode&ODIRECT){
27 		umode |= O_DIRECT;
28 		mode ^= ODIRECT;
29 	}
30 	if(mode){
31 		werrstr("mode 0x%x not supported", mode);
32 		return -1;
33 	}
34 	fd = open(name, umode);
35 	if(fd >= 0){
36 		if(lock){
37 			if(flock(fd, (rdwr==OREAD) ? LOCK_SH : LOCK_EX) < 0){
38 				close(fd);
39 				return -1;
40 			}
41 		}
42 		if(cexec)
43 			fcntl(fd, F_SETFL, FD_CLOEXEC);
44 		if(rclose)
45 			remove(name);
46 	}
47 	return fd;
48 }