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Viewing changes to lib9/create.c

  • Committer: Bazaar Package Importer
  • Author(s): Daniel Baumann
  • Date: 2006-01-25 15:33:00 UTC
  • Revision ID: james.westby@ubuntu.com-20060125153300-6hh4p9wx8iqqply5
Tags: upstream-2
Import upstream version 2

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lib9/create.c
 
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#define _GNU_SOURCE     /* for Linux O_DIRECT */
 
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#include <u.h>
 
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#define NOPLAN9DEFINES
 
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#include <sys/file.h>
 
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#include <unistd.h>
 
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#include <fcntl.h>
 
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#include <libc.h>
 
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#include <sys/stat.h>
 
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#ifndef O_DIRECT
 
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#define O_DIRECT 0
 
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#endif
 
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int
 
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p9create(char *path, int mode, ulong perm)
 
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{
 
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        int fd, cexec, umode, rclose, lock, rdwr;
 
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        struct flock fl;
 
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        rdwr = mode&3;
 
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        lock = mode&OLOCK;
 
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        cexec = mode&OCEXEC;
 
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        rclose = mode&ORCLOSE;
 
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        mode &= ~(ORCLOSE|OCEXEC|OLOCK);
 
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        /* XXX should get mode mask right? */
 
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        fd = -1;
 
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        if(perm&DMDIR){
 
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                if(mode != OREAD){
 
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                        werrstr("bad mode in directory create");
 
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                        goto out;
 
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                }
 
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                if(mkdir(path, perm&0777) < 0)
 
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                        goto out;
 
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                fd = open(path, O_RDONLY);
 
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        }else{
 
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                umode = (mode&3)|O_CREAT|O_TRUNC;
 
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                mode &= ~(3|OTRUNC);
 
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                if(mode&ODIRECT){
 
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                        umode |= O_DIRECT;
 
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                        mode &= ~ODIRECT;
 
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                }
 
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                if(mode&OEXCL){
 
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                        umode |= O_EXCL;
 
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                        mode &= ~OEXCL;
 
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                }
 
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                if(mode&OAPPEND){
 
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                        umode |= O_APPEND;
 
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                        mode &= ~OAPPEND;
 
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                }
 
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                if(mode){
 
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                        werrstr("unsupported mode in create");
 
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                        goto out;
 
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                }
 
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                fd = open(path, umode, perm);
 
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        }
 
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out:
 
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        if(fd >= 0){
 
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                if(lock){
 
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                        fl.l_type = (rdwr==OREAD) ? F_RDLCK : F_WRLCK;
 
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                        fl.l_whence = SEEK_SET;
 
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                        fl.l_start = 0;
 
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                        fl.l_len = 0;
 
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                        if(fcntl(fd, F_SETLK, &fl) < 0){
 
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                                close(fd);
 
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                                werrstr("lock: %r");
 
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                                return -1;
 
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                        }
 
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                }
 
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                if(cexec)
 
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                        fcntl(fd, F_SETFL, FD_CLOEXEC);
 
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                if(rclose)
 
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                        remove(path);
 
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        }
 
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        return fd;
 
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}