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/*
* Copyright (c) 1997-1999 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
#include <stdarg.h>
#include <fcntl.h>
#include "fd.h"
#include "fs.h"
#include <oskit/fs/soa.h>
int
open(const char *name, int flags, ...)
{
oskit_file_t *f;
oskit_openfile_t *fsfd;
int fd, mode, rc = 0, excl = 0;
va_list pvar;
va_start(pvar, flags);
mode = va_arg(pvar, int);
va_end(pvar);
if (flags & O_EXCL)
excl = 1;
#if VERBOSITY > 1
printf("open '%s' flags %08x, mode %o\n", name, flags, mode);
#endif
rc = fs_lookup(name, FSLOOKUP_FOLLOW, &f);
/* create if not found and creat flag set */
if ((rc == OSKIT_ENOENT) && (flags & O_CREAT)) {
oskit_dir_t *dir;
if ((rc = fs_lookup_dir(&name, FSLOOKUP_NOFLAGS, &dir)) != 0)
return errno = rc, -1;
rc = oskit_dir_create(dir, name, excl, mode &~ fs_cmask, &f);
oskit_dir_release(dir);
}
if (rc) {
errno = rc;
return -1;
}
/*
* now, the file has either been found or created -
* we hold a reference to it in `f'
*/
rc = oskit_file_open(f, flags & ~(O_CREAT | O_EXCL), &fsfd);
if (rc) {
oskit_file_release(f);
#if VERBOSITY > 0
printf("FAIL: open '%s' flags %08x, errno=0x%x\n",
name, flags, rc);
#endif
errno = rc;
return -1;
}
if (fsfd == NULL) {
/*
* oskit_file_open may succeed but return a NULL openfile,
* if the file system does not implement per-open state.
* In that case we must do it ourselves.
*/
rc = oskit_soa_openfile_from_file(f,
flags & (O_RDWR | O_APPEND), &fsfd);
if (rc) {
oskit_file_release(f);
errno = rc;
return -1;
}
}
/*
* COM open doesn't truncate, so we must do it
*/
if (flags & O_TRUNC) {
struct oskit_stat st;
st.size = 0;
rc = oskit_file_setstat(f, OSKIT_STAT_SIZE, &st);
if (rc)
return errno = rc, -1;
}
oskit_file_release(f);
/* assign a file descriptor to the new openfile */
fd = fd_alloc((oskit_iunknown_t*)fsfd, 0);
if (fd < 0) {
return -1;
}
fd_lock(fd);
fd_array[fd].openfile = fsfd;
fd_unlock(fd);
return fd;
}
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