prfile.c

Netscape NSPR库源码

    if (!_pr_initialized) _PR_ImplicitInitialization();

    /* Map pr open flags and mode to os specific flags */

    osfd = _PR_MD_OPEN_FILE(name, flags, mode);
    if (osfd != -1) {
        fd = PR_AllocFileDesc(osfd, &_pr_fileMethods);
        if (!fd) {
            (void) _PR_MD_CLOSE_FILE(osfd);
        } else {
#if !defined(XP_UNIX) /* BugZilla: 4090 */
            fd->secret->appendMode = appendMode;
#endif
            _PR_MD_INIT_FD_INHERITABLE(fd, PR_FALSE);
        }
    }
    return fd;
}

PRInt32 PR_GetSysfdTableMax(void)
{
#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
    struct rlimit rlim;

    if ( getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
       /* XXX need to call PR_SetError() */
       return -1;
    }

    return rlim.rlim_max;
#elif defined(AIX) || defined(NEXTSTEP) || defined(QNX)
    return sysconf(_SC_OPEN_MAX);
#elif defined(WIN32) || defined(OS2)
    /*
     * There is a systemwide limit of 65536 user handles.
     * Not sure on OS/2, but sounds good.
     */
    return 16384;
#elif defined (WIN16)
    return FOPEN_MAX;
#elif defined (XP_MAC) || defined(XP_BEOS)
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
   return -1;
#else
    write me;
#endif
}

PRInt32 PR_SetSysfdTableSize(int table_size)
{
#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP) && !defined(QNX)
    struct rlimit rlim;
    PRInt32 tableMax = PR_GetSysfdTableMax();

    if (tableMax < 0) 
        return -1;

    if (tableMax > FD_SETSIZE)
        tableMax = FD_SETSIZE;

    rlim.rlim_max = tableMax;

    /* Grow as much as we can; even if too big */
    if ( rlim.rlim_max < table_size )
        rlim.rlim_cur = rlim.rlim_max;
    else
        rlim.rlim_cur = table_size;

    if ( setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
        /* XXX need to call PR_SetError() */
        return -1;
    }

    return rlim.rlim_cur;
#elif defined(AIX) || defined(NEXTSTEP) || defined(QNX) \
        || defined(WIN32) || defined(WIN16) || defined(OS2) \
        || defined(XP_BEOS)
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return -1;
#elif defined (XP_MAC)
#pragma unused (table_size)
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
   return -1;
#else
    write me;
#endif
}

PR_IMPLEMENT(PRStatus) PR_Delete(const char *name)
{
	PRInt32 rv;

	rv = _PR_MD_DELETE(name);
	if (rv < 0) {
		return PR_FAILURE;
	} else
		return PR_SUCCESS;
}

PR_IMPLEMENT(PRStatus) PR_GetFileInfo(const char *fn, PRFileInfo *info)
{
	PRInt32 rv;

	rv = _PR_MD_GETFILEINFO(fn, info);
	if (rv < 0) {
		return PR_FAILURE;
	} else
		return PR_SUCCESS;
}

PR_IMPLEMENT(PRStatus) PR_GetFileInfo64(const char *fn, PRFileInfo64 *info)
{
#ifdef XP_MAC
#pragma unused (fn, info)
#endif
    PRInt32 rv;

    if (!_pr_initialized) _PR_ImplicitInitialization();
    rv = _PR_MD_GETFILEINFO64(fn, info);
    if (rv < 0) {
        return PR_FAILURE;
    } else {
        return PR_SUCCESS;
    }
}

PR_IMPLEMENT(PRStatus) PR_Rename(const char *from, const char *to)
{
	PRInt32 rv;

	rv = _PR_MD_RENAME(from, to);
	if (rv < 0) {
		return PR_FAILURE;
	} else
		return PR_SUCCESS;
}

PR_IMPLEMENT(PRStatus) PR_Access(const char *name, PRAccessHow how)
{
PRInt32 rv;

	rv = _PR_MD_ACCESS(name, how);
	if (rv < 0) {
		return PR_FAILURE;
	} else
		return PR_SUCCESS;
}

/*
** Import an existing OS file to NSPR 
*/
PR_IMPLEMENT(PRFileDesc*) PR_ImportFile(PRInt32 osfd)
{
    PRFileDesc *fd = NULL;

    if (!_pr_initialized) _PR_ImplicitInitialization();

    fd = PR_AllocFileDesc(osfd, &_pr_fileMethods);
    if( !fd ) {
        (void) _PR_MD_CLOSE_FILE(osfd);
    } else {
        _PR_MD_INIT_FD_INHERITABLE(fd, PR_TRUE);
    }

    return fd;
}

/*
** Import an existing OS pipe to NSPR 
*/
PR_IMPLEMENT(PRFileDesc*) PR_ImportPipe(PRInt32 osfd)
{
    PRFileDesc *fd = NULL;

    if (!_pr_initialized) _PR_ImplicitInitialization();

    fd = PR_AllocFileDesc(osfd, &_pr_pipeMethods);
    if( !fd ) {
        (void) _PR_MD_CLOSE_FILE(osfd);
    } else {
        _PR_MD_INIT_FD_INHERITABLE(fd, PR_TRUE);
#ifdef WINNT
        fd->secret->md.sync_file_io = PR_TRUE;
#endif
    }

    return fd;
}

#ifndef NO_NSPR_10_SUPPORT
/*
** PR_Stat() for Win16 is defined in w16io.c
** it is a hack to circumvent problems in Gromit and Java
** See also: BugSplat: 98516.
*/
#if !defined(WIN16)
/*
 * This function is supposed to be for backward compatibility with
 * nspr 1.0.  Therefore, it still uses the nspr 1.0 error-reporting
 * mechanism -- returns a PRInt32, which is the error code when the call
 * fails.
 * 
 * If we need this function in nspr 2.0, it should be changed to
 * return PRStatus, as follows:
 *
 * PR_IMPLEMENT(PRStatus) PR_Stat(const char *name, struct stat *buf)
 * {
 *     PRInt32 rv;
 *
 *     rv = _PR_MD_STAT(name, buf);
 *     if (rv < 0)
 *         return PR_FAILURE;
 *     else
 *         return PR_SUCCESS;
 * }
 *
 * -- wtc, 2/14/97.
 */
PR_IMPLEMENT(PRInt32) PR_Stat(const char *name, struct stat *buf)
{
    PRInt32 rv;

    rv = _PR_MD_STAT(name, buf);
	return rv;
}

#endif /* !defined(WIN16)  */
#endif /* ! NO_NSPR_10_SUPPORT */

PR_IMPLEMENT(PRStatus) PR_LockFile(PRFileDesc *fd)
{
    PRStatus status = PR_SUCCESS;

#ifdef WINNT
    if (!fd->secret->md.io_model_committed) {
        PRInt32 rv;
        rv = _md_Associate((HANDLE)fd->secret->md.osfd);
        PR_ASSERT(0 != rv);
        fd->secret->md.io_model_committed = PR_TRUE;
    }
#endif

    PR_Lock(_pr_flock_lock);
    while (fd->secret->lockCount == -1)
        PR_WaitCondVar(_pr_flock_cv, PR_INTERVAL_NO_TIMEOUT);
    if (fd->secret->lockCount == 0) {
        fd->secret->lockCount = -1;
        PR_Unlock(_pr_flock_lock);
        status = _PR_MD_LOCKFILE(fd->secret->md.osfd);
        PR_Lock(_pr_flock_lock);
        fd->secret->lockCount = (status == PR_SUCCESS) ? 1 : 0;
        PR_NotifyAllCondVar(_pr_flock_cv);
    } else {
        fd->secret->lockCount++;
    }
    PR_Unlock(_pr_flock_lock);
 
    return status;
}

PR_IMPLEMENT(PRStatus) PR_TLockFile(PRFileDesc *fd)
{
    PRStatus status = PR_SUCCESS;

#ifdef WINNT
    if (!fd->secret->md.io_model_committed) {
        PRInt32 rv;
        rv = _md_Associate((HANDLE)fd->secret->md.osfd);
        PR_ASSERT(0 != rv);
        fd->secret->md.io_model_committed = PR_TRUE;
    }
#endif

    PR_Lock(_pr_flock_lock);
    if (fd->secret->lockCount == 0) {
        status = _PR_MD_TLOCKFILE(fd->secret->md.osfd);
        PR_ASSERT(status == PR_SUCCESS || fd->secret->lockCount == 0);
        if (status == PR_SUCCESS)
            fd->secret->lockCount = 1;
    } else {
        fd->secret->lockCount++;
    }
    PR_Unlock(_pr_flock_lock);

    return status;
}

PR_IMPLEMENT(PRStatus) PR_UnlockFile(PRFileDesc *fd)
{
    PRStatus rv = PR_SUCCESS;

    PR_Lock(_pr_flock_lock);
    if (fd->secret->lockCount == 1) {
        rv = _PR_MD_UNLOCKFILE(fd->secret->md.osfd);
        if (rv == PR_SUCCESS) 
            fd->secret->lockCount = 0;
    } else {
        fd->secret->lockCount--;
    }
    PR_Unlock(_pr_flock_lock);

    return rv;
}

PR_IMPLEMENT(PRStatus) PR_CreatePipe(
    PRFileDesc **readPipe,
    PRFileDesc **writePipe
)
{
#if defined(XP_MAC)
#pragma unused (readPipe, writePipe)
#endif

#ifdef WIN32
    HANDLE readEnd, writeEnd;
    SECURITY_ATTRIBUTES pipeAttributes;

    if (!_pr_initialized) _PR_ImplicitInitialization();

    ZeroMemory(&pipeAttributes, sizeof(pipeAttributes));
    pipeAttributes.nLength = sizeof(pipeAttributes);
    pipeAttributes.bInheritHandle = TRUE;
    if (CreatePipe(&readEnd, &writeEnd, &pipeAttributes, 0) == 0) {
        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
        return PR_FAILURE;
    }
    *readPipe = PR_AllocFileDesc((PRInt32)readEnd, &_pr_pipeMethods);
    if (NULL == *readPipe) {
        CloseHandle(readEnd);
        CloseHandle(writeEnd);
        return PR_FAILURE;
    }
    *writePipe = PR_AllocFileDesc((PRInt32)writeEnd, &_pr_pipeMethods);
    if (NULL == *writePipe) {
        PR_Close(*readPipe);
        CloseHandle(writeEnd);
        return PR_FAILURE;
    }
#ifdef WINNT
    (*readPipe)->secret->md.sync_file_io = PR_TRUE;
    (*writePipe)->secret->md.sync_file_io = PR_TRUE;
#endif
    (*readPipe)->secret->inheritable = _PR_TRI_TRUE;
    (*writePipe)->secret->inheritable = _PR_TRI_TRUE;
    return PR_SUCCESS;
#elif defined(XP_UNIX) || defined(XP_OS2) || defined(XP_BEOS)
#ifdef XP_OS2
    HFILE pipefd[2];
#else
    int pipefd[2];
#endif

    if (!_pr_initialized) _PR_ImplicitInitialization();

#ifdef XP_OS2
    if (DosCreatePipe(&pipefd[0], &pipefd[1], 4096) != 0) {
#else
    if (pipe(pipefd) == -1) {
#endif
        /* XXX map pipe error */
        PR_SetError(PR_UNKNOWN_ERROR, errno);
        return PR_FAILURE;
    }
    *readPipe = PR_AllocFileDesc(pipefd[0], &_pr_pipeMethods);
    if (NULL == *readPipe) {
        close(pipefd[0]);
        close(pipefd[1]);
        return PR_FAILURE;
    }
    *writePipe = PR_AllocFileDesc(pipefd[1], &_pr_pipeMethods);
    if (NULL == *writePipe) {
        PR_Close(*readPipe);
        close(pipefd[1]);
        return PR_FAILURE;
    }
#ifndef XP_BEOS /* Pipes are nonblocking on BeOS */
    _PR_MD_MAKE_NONBLOCK(*readPipe);
#endif
    _PR_MD_INIT_FD_INHERITABLE(*readPipe, PR_FALSE);
#ifndef XP_BEOS /* Pipes are nonblocking on BeOS */
    _PR_MD_MAKE_NONBLOCK(*writePipe);
#endif
    _PR_MD_INIT_FD_INHERITABLE(*writePipe, PR_FALSE);
    return PR_SUCCESS;
#else
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return PR_FAILURE;
#endif
}