| /* |
| 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; |
| } |