home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Sprite 1984 - 1993
/
Sprite 1984 - 1993.iso
/
src
/
lib
/
c
/
unixSyscall
/
open.c
< prev
next >
Wrap
C/C++ Source or Header
|
1988-11-03
|
2KB
|
101 lines
/*
* open.c --
*
* Procedure to map from Unix open system call to Sprite.
*
* Copyright (C) 1986 Regents of the University of California
* All rights reserved.
*/
#ifndef lint
static char rcsid[] = "$Header: /sprite/src/lib/c/unixSyscall/RCS/open.c,v 1.7 88/11/03 08:42:16 ouster Exp $ SPRITE (Berkeley)";
#endif not lint
#include <sprite.h>
#include <stdio.h>
#include <fs.h>
#include "compatInt.h"
#include <sys/file.h>
#include <errno.h>
#include <status.h>
/*
*----------------------------------------------------------------------
*
* open --
*
* Procedure to map from Unix open system call to Sprite Fs_Open.
* Mostly this has to map the usageFlags argument
*
* Results:
* UNIX_ERROR is returned upon error, with the actual error code
* stored in errno. A file descriptor is returned upon success.
*
* Side effects:
* Opening a file sets up state in the filesystem until the file is
* closed.
*
*----------------------------------------------------------------------
*/
/* VARARGS2 */
int
open(pathName, unixFlags, permissions)
char *pathName; /* The name of the file to open */
register int unixFlags; /* O_RDONLY O_WRONLY O_RDWR O_NDELAY
* O_APPEND O_CREAT O_TRUNC O_EXCL */
int permissions; /* Permission mask to use on creation */
{
int streamId; /* place to hold stream id allocated by
* Fs_Open */
ReturnStatus status; /* result returned by Fs_Open */
register int useFlags = 0; /* Sprite version of flags */
/*
* Convert unixFlags to FS_READ, etc.
*/
if (unixFlags & FASYNC) {
fprintf(stderr, "open - FASYNC not supported\n");
errno = EINVAL;
return(UNIX_ERROR);
}
if (unixFlags & O_RDWR) {
useFlags |= FS_READ|FS_WRITE;
} else if (unixFlags & O_WRONLY) {
useFlags |= FS_WRITE;
} else {
useFlags |= FS_READ;
}
if (unixFlags & FNDELAY) {
useFlags |= FS_NON_BLOCKING;
}
if (unixFlags & FAPPEND) {
useFlags |= FS_APPEND;
}
if (unixFlags & FTRUNC) {
useFlags |= FS_TRUNC;
}
if (unixFlags & FEXCL) {
useFlags |= FS_EXCLUSIVE;
}
if (unixFlags & O_MASTER) {
useFlags |= FS_PDEV_MASTER;
}
if (unixFlags & O_PFS_MASTER) {
useFlags |= FS_PFS_MASTER;
}
if (unixFlags & FCREAT) {
useFlags |= FS_CREATE;
}
status = Fs_Open(pathName, useFlags, permissions, &streamId);
if (status != SUCCESS) {
errno = Compat_MapCode(status);
return(UNIX_ERROR);
} else {
return(streamId);
}
}