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 #include <sys/stat.h>
7 #ifndef O_DIRECT
8 #define O_DIRECT 0
9 #endif
10 
11 int
12 p9create(char *path, int mode, ulong perm)
13 {
14 	int fd, cexec, umode, rclose, lock, rdwr;
15 
16 	rdwr = mode&3;
17 	lock = mode&OLOCK;
18 	cexec = mode&OCEXEC;
19 	rclose = mode&ORCLOSE;
20 	mode &= ~(ORCLOSE|OCEXEC|OLOCK);
21 
22 	/* XXX should get mode mask right? */
23 	fd = -1;
24 	if(perm&DMDIR){
25 		if(mode != OREAD){
26 			werrstr("bad mode in directory create");
27 			goto out;
28 		}
29 		if(mkdir(path, perm&0777) < 0)
30 			goto out;
31 		fd = open(path, O_RDONLY);
32 	}else{
33 		umode = (mode&3)|O_CREAT|O_TRUNC;
34 		mode &= ~(3|OTRUNC);
35 		if(mode&ODIRECT){
36 			umode |= O_DIRECT;
37 			mode &= ~ODIRECT;
38 		}
39 		if(mode&OEXCL){
40 			umode |= O_EXCL;
41 			mode &= ~OEXCL;
42 		}
43 		if(mode){
44 			werrstr("unsupported mode in create");
45 			goto out;
46 		}
47 		fd = open(path, umode, perm);
48 	}
49 out:
50 	if(fd >= 0){
51 		if(lock){
52 			if(flock(fd, (rdwr==OREAD) ? LOCK_SH : LOCK_EX) < 0){
53 				close(fd);
54 				return -1;
55 			}
56 		}
57 		if(cexec)
58 			fcntl(fd, F_SETFL, FD_CLOEXEC);
59 		if(rclose)
60 			remove(path);
61 	}
62 	return fd;
63 }