576 lines
13 KiB
C
576 lines
13 KiB
C
/* $Xorg: utils.c,v 1.4 2001/02/09 02:05:45 xorgcvs Exp $ */
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/*
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* misc os utilities
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*/
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/*
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Copyright 1990, 1991, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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* Copyright 1990, 1991 Network Computing Devices;
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* Portions Copyright 1987 by Digital Equipment Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the names of Network Computing Devices, or Digital
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* not be used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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*
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* NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES,
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* OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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* THIS SOFTWARE.
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*/
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/* $XFree86: xc/programs/xfs/os/utils.c,v 3.20 2002/10/15 01:45:03 dawes Exp $ */
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#include <stdio.h>
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#include <X11/Xos.h>
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#include <stdlib.h>
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#include "misc.h"
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#include "globals.h"
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#include <signal.h>
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#ifdef MEMBUG
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#include <util/memleak/memleak.h>
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#endif
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#include <sys/wait.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <grp.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#ifndef X_NOT_POSIX
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#ifdef _POSIX_SOURCE
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#include <limits.h>
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#else
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#define _POSIX_SOURCE
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#include <limits.h>
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#undef _POSIX_SOURCE
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#endif
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#endif /* X_NOT_POSIX */
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#ifndef PATH_MAX
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#include <sys/param.h>
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#ifndef PATH_MAX
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#ifdef MAXPATHLEN
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#define PATH_MAX MAXPATHLEN
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#else
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#define PATH_MAX 1024
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#endif
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#endif
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#endif /* PATH_MAX */
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#if defined(X_NOT_POSIX) && (defined(SYSV) || defined(SVR4))
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#define SIGNALS_RESET_WHEN_CAUGHT
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#endif
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#include <stdlib.h>
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extern char *configfilename;
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static Bool dropPriv = FALSE; /* whether or not to drop root privileges */
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#ifdef DEFAULT_DAEMON
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static Bool becomeDaemon = TRUE; /* whether to become a daemon or not */
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#else
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static Bool becomeDaemon = FALSE; /* whether to become a daemon or not */
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#endif
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static const char *userId = NULL;
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char *progname;
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Bool CloneSelf;
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Bool portFromCmdline = FALSE;
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OldListenRec *OldListen = NULL;
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int OldListenCount = 0;
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#ifdef STDERR_FILENO
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# define WRITES write(STDERR_FILENO, s, strlen(s))
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#else
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# define WRITES write(fileno(stderr), s, strlen(s))
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#endif
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static char *pidFile = XFSPIDDIR "/xfs.pid";
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static int pidFd;
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static FILE *pidFilePtr;
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static int StorePid (void);
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/* ARGSUSED */
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SIGVAL
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AutoResetServer(int n)
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{
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int olderrno = errno;
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#ifdef DEBUG
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WRITES("got a reset signal\n");
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#endif
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dispatchException |= DE_RESET;
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isItTimeToYield = TRUE;
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#ifdef SIGNALS_RESET_WHEN_CAUGHT
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signal(SIGHUP, AutoResetServer);
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#endif
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errno = olderrno;
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}
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/* ARGSUSED */
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SIGVAL
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GiveUp(int n)
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{
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int olderrno = errno;
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#ifdef DEBUG
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WRITES("got a TERM signal\n");
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#endif
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dispatchException |= DE_TERMINATE;
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isItTimeToYield = TRUE;
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errno = olderrno;
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}
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/* ARGSUSED */
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SIGVAL
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ServerReconfig(int n)
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{
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int olderrno = errno;
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#ifdef DEBUG
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WRITES("got a re-config signal\n");
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#endif
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dispatchException |= DE_RECONFIG;
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isItTimeToYield = TRUE;
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#ifdef SIGNALS_RESET_WHEN_CAUGHT
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signal(SIGUSR1, ServerReconfig);
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#endif
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errno = olderrno;
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}
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/* ARGSUSED */
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SIGVAL
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ServerCacheFlush(int n)
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{
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int olderrno = errno;
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#ifdef DEBUG
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WRITES("got a flush signal\n");
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#endif
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dispatchException |= DE_FLUSH;
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isItTimeToYield = TRUE;
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#ifdef SIGNALS_RESET_WHEN_CAUGHT
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signal(SIGUSR2, ServerCacheFlush);
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#endif
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errno = olderrno;
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}
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/* ARGSUSED */
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SIGVAL
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CleanupChild(int n)
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{
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int olderrno = errno;
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#ifdef DEBUG
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WRITES("got a child signal\n");
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#endif
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wait(NULL);
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#ifdef SIGNALS_RESET_WHEN_CAUGHT
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signal(SIGCHLD, CleanupChild);
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#endif
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errno = olderrno;
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}
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long
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GetTimeInMillis(void)
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{
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struct timeval tp;
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X_GETTIMEOFDAY(&tp);
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return ((tp.tv_sec * 1000) + (tp.tv_usec / 1000));
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-config config_file] [-port tcp_port] [-droppriv] [-daemon] [-nodaemon] [-user user_name] [-ls listen_socket]\n",
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progname);
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exit(1);
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}
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void
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OsInitAllocator (void)
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{
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#ifdef MEMBUG
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CheckMemory ();
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#endif
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}
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/*
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* The '-ls' option is used for cloning the font server.
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*
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* We expect a single string of the form...
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*
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* transport_id/fd/portnum[,transport_id/fd/portnum]...
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*
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* [] denotes optional and ... denotes repitition.
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*
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* The string must be _exactly_ in the above format.
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*/
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void
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ProcessLSoption (char *str)
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{
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char *ptr = str;
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char *slash;
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char number[20];
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int count = 0;
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int len, i;
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while (*ptr != '\0')
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{
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if (*ptr == ',')
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count++;
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ptr++;
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}
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OldListenCount = count + 1;
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OldListen = (OldListenRec *) malloc (
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OldListenCount * sizeof (OldListenRec));
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if (OldListen == NULL) {
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fprintf(stderr, "ProcessLSoption: malloc error\n");
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exit(1);
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}
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ptr = str;
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for (i = 0; i < OldListenCount; i++)
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{
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slash = (char *) strchr (ptr, '/');
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if (slash == NULL) {
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usage();
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}
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len = slash - ptr;
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strncpy (number, ptr, len);
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number[len] = '\0';
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OldListen[i].trans_id = atoi (number);
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ptr = slash + 1;
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slash = (char *) strchr (ptr, '/');
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if (slash == NULL) {
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usage();
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}
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len = slash - ptr;
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strncpy (number, ptr, len);
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number[len] = '\0';
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OldListen[i].fd = atoi (number);
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ptr = slash + 1;
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if (i == OldListenCount - 1)
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OldListen[i].portnum = atoi (ptr);
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else
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{
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char *comma = (char *) strchr (ptr, ',');
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if (comma == NULL) {
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usage();
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}
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len = comma - ptr;
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strncpy (number, ptr, len);
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number[len] = '\0';
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OldListen[i].portnum = atoi (number);
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ptr = comma + 1;
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}
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}
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}
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/* ARGSUSED */
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void
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ProcessCmdLine(int argc, char **argv)
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{
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int i;
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progname = argv[0];
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for (i = 1; i < argc; i++) {
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if (!strcmp(argv[i], "-port")) {
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if (argv[i + 1]) {
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ListenPort = atoi(argv[++i]);
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portFromCmdline = TRUE;
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} else
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usage();
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} else if (!strcmp(argv[i], "-ls")) {
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if (argv[i + 1])
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ProcessLSoption (argv[++i]);
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else
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usage();
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} else if (!strcmp(argv[i], "-droppriv")) {
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dropPriv = TRUE;
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} else if (!strcmp(argv[i], "-daemon")) {
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becomeDaemon = TRUE;
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} else if (!strcmp(argv[i], "-nodaemon")) {
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becomeDaemon = FALSE;
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} else if (!strcmp(argv[i], "-user")) {
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if (argv[i + 1])
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userId = argv[++i];
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else
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usage();
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} else if (!strcmp(argv[i], "-cf") || !strcmp(argv[i], "-config")) {
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if (argv[i + 1])
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configfilename = argv[++i];
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else
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usage();
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}
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#ifdef MEMBUG
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else if ( strcmp( argv[i], "-alloc") == 0)
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{
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extern unsigned long MemoryFail;
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if(++i < argc)
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MemoryFail = atoi(argv[i]);
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else
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usage ();
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}
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#endif
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else
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usage();
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}
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}
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#ifndef SPECIAL_MALLOC
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unsigned long Must_have_memory;
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#ifdef MEMBUG
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#define MEM_FAIL_SCALE 100000
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unsigned long MemoryFail;
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#endif
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/* FSalloc -- FS's internal memory allocator. Why does it return unsigned
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* int * instead of the more common char *? Well, if you read K&R you'll
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* see they say that alloc must return a pointer "suitable for conversion"
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* to whatever type you really want. In a full-blown generic allocator
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* there's no way to solve the alignment problems without potentially
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* wasting lots of space. But we have a more limited problem. We know
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* we're only ever returning pointers to structures which will have to
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* be long word aligned. So we are making a stronger guarantee. It might
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* have made sense to make FSalloc return char * to conform with people's
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* expectations of malloc, but this makes lint happier.
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*/
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pointer
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FSalloc (unsigned long amount)
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{
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register pointer ptr;
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if ((long)amount < 0)
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return 0;
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if (amount == 0)
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amount++;
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/* aligned extra on long word boundary */
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amount = (amount + 3) & ~3;
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#ifdef MEMBUG
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if (!Must_have_memory && MemoryFail &&
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((random() % MEM_FAIL_SCALE) < MemoryFail))
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return 0;
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if (ptr = (pointer)fmalloc(amount))
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return ptr;
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#else
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if ((ptr = (pointer)malloc(amount)) != 0)
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return ptr;
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#endif
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if (Must_have_memory)
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FatalError("out of memory\n");
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return 0;
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}
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/*****************
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* FScalloc
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*****************/
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pointer
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FScalloc (unsigned long amount)
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{
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pointer ret;
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ret = FSalloc (amount);
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if (ret)
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bzero ((char *) ret, (int) amount);
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return ret;
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}
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/*****************
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* FSrealloc
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*****************/
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pointer
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FSrealloc (pointer ptr, unsigned long amount)
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{
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#ifdef MEMBUG
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if (!Must_have_memory && MemoryFail &&
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((random() % MEM_FAIL_SCALE) < MemoryFail))
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return 0;
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ptr = (pointer)frealloc((char *) ptr, amount);
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if (ptr)
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return ptr;
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#else
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if ((long)amount <= 0)
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{
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if (ptr && !amount)
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free(ptr);
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return 0;
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}
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amount = (amount + 3) & ~3;
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if (ptr)
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ptr = (pointer)realloc((char *)ptr, amount);
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else
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ptr = (pointer)malloc(amount);
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if (ptr)
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return ptr;
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#endif
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if (Must_have_memory)
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FatalError("out of memory\n");
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return 0;
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}
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/*****************
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* FSfree
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* calls free
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*****************/
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void
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FSfree(pointer ptr)
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{
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#ifdef MEMBUG
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if (ptr)
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ffree((char *)ptr);
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#else
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if (ptr)
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free((char *)ptr);
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#endif
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}
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#endif /* SPECIAL_MALLOC */
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void
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SetUserId(void)
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{
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/* become xfs user (or other specified on command line) if possible */
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if ((geteuid() == 0) && (dropPriv || userId)) {
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const char *user;
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struct passwd *pwent;
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if (!userId)
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user = "xfs";
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else
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user = userId;
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pwent = getpwnam(user);
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if (pwent) {
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if (setgid(pwent->pw_gid)) {
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FatalError("fatal: couldn't set groupid to xfs user's group\n");
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}
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#ifndef QNX4
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#ifndef __CYGWIN__
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if (setgroups(0, NULL)) {
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FatalError("fatal: couldn't drop supplementary groups\n");
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}
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#endif
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if (initgroups(user, pwent->pw_gid)) {
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FatalError("fatal: couldn't init supplementary groups\n");
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}
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#endif /* QNX4 */
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if (setuid(pwent->pw_uid)) {
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FatalError("fatal: couldn't set userid to %s user\n", user);
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}
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}
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} else if (dropPriv || userId) {
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FatalError("fatal: -droppriv or -user flag specified, but xfs not run as root\n");
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}
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}
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void
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SetDaemonState(void)
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{
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int oldpid;
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if (becomeDaemon) {
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BecomeDaemon();
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if ((oldpid = StorePid ())) {
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if (oldpid == -1)
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ErrorF ("error opening process-id file %s\n", pidFile);
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else
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ErrorF ("process-id file %s indicates another xfs is "
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"running (pid %d); exiting\n", pidFile, oldpid);
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exit(1);
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}
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}
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}
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static int
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StorePid (void)
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{
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int oldpid;
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if (pidFile[0] != '\0') {
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pidFd = open (pidFile, O_RDWR);
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if (pidFd == -1 && errno == ENOENT)
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pidFd = open (pidFile, O_RDWR|O_CREAT, 0666);
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if (pidFd == -1 || !(pidFilePtr = fdopen (pidFd, "r+")))
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{
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ErrorF ("cannot open process-id file %s: %s\n", pidFile,
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strerror (errno));
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return -1;
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}
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if (fscanf (pidFilePtr, "%d\n", &oldpid) != 1)
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oldpid = -1;
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if (fseek (pidFilePtr, 0L, SEEK_SET) == -1)
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{
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ErrorF ("cannot seek process-id file %s: %s\n", pidFile,
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strerror (errno));
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return -1;
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}
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if (fprintf (pidFilePtr, "%11ld\n", (long) getpid ()) != 12)
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{
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ErrorF ("cannot write to process-id file %s: %s\n", pidFile,
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strerror (errno));
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return -1;
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}
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(void) fflush (pidFilePtr);
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(void) fclose (pidFilePtr);
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}
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return 0;
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}
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