diff options
author | Rob Pike <r@golang.org> | 2008-06-12 13:26:16 -0700 |
---|---|---|
committer | Rob Pike <r@golang.org> | 2008-06-12 13:26:16 -0700 |
commit | c348f82e29356fc95dcb6331b4860b2d76fa07aa (patch) | |
tree | f571b5448e5f72870de933c01d9a6dcf04879e85 /src/lib9/create.c | |
parent | 4732d2a3518bda35334461950464d2dffcd008b2 (diff) | |
download | go-c348f82e29356fc95dcb6331b4860b2d76fa07aa.tar.gz |
import the plan 9 libraries libc (lib9) and libbio into the tree.
remove the dependency on /home/r.
SVN=122482
Diffstat (limited to 'src/lib9/create.c')
-rw-r--r-- | src/lib9/create.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/lib9/create.c b/src/lib9/create.c new file mode 100644 index 000000000..8e5cbc360 --- /dev/null +++ b/src/lib9/create.c @@ -0,0 +1,99 @@ +/* +Plan 9 from User Space src/lib9/create.c +http://code.swtch.com/plan9port/src/tip/src/lib9/create.c + +Copyright 2001-2007 Russ Cox. All Rights Reserved. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ +#define _GNU_SOURCE /* for Linux O_DIRECT */ +#include <u.h> +#define NOPLAN9DEFINES +#include <sys/file.h> +#include <unistd.h> +#include <fcntl.h> +#include <libc.h> +#include <sys/stat.h> +#ifndef O_DIRECT +#define O_DIRECT 0 +#endif + +int +p9create(char *path, int mode, ulong perm) +{ + int fd, cexec, umode, rclose, lock, rdwr; + struct flock fl; + + rdwr = mode&3; + lock = mode&OLOCK; + cexec = mode&OCEXEC; + rclose = mode&ORCLOSE; + mode &= ~(ORCLOSE|OCEXEC|OLOCK); + + /* XXX should get mode mask right? */ + fd = -1; + if(perm&DMDIR){ + if(mode != OREAD){ + werrstr("bad mode in directory create"); + goto out; + } + if(mkdir(path, perm&0777) < 0) + goto out; + fd = open(path, O_RDONLY); + }else{ + umode = (mode&3)|O_CREAT|O_TRUNC; + mode &= ~(3|OTRUNC); + if(mode&ODIRECT){ + umode |= O_DIRECT; + mode &= ~ODIRECT; + } + if(mode&OEXCL){ + umode |= O_EXCL; + mode &= ~OEXCL; + } + if(mode&OAPPEND){ + umode |= O_APPEND; + mode &= ~OAPPEND; + } + if(mode){ + werrstr("unsupported mode in create"); + goto out; + } + fd = open(path, umode, perm); + } +out: + if(fd >= 0){ + if(lock){ + fl.l_type = (rdwr==OREAD) ? F_RDLCK : F_WRLCK; + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 0; + if(fcntl(fd, F_SETLK, &fl) < 0){ + close(fd); + werrstr("lock: %r"); + return -1; + } + } + if(cexec) + fcntl(fd, F_SETFL, FD_CLOEXEC); + if(rclose) + remove(path); + } + return fd; +} |