/* $Xorg: utils.c,v 1.4 2001/02/09 02:05:45 xorgcvs Exp $ */ /* * misc os utilities */ /* Copyright 1990, 1991, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. * Copyright 1990, 1991 Network Computing Devices; * Portions Copyright 1987 by Digital Equipment Corporation * * Permission to use, copy, modify, distribute, and sell this software and * its documentation for any purpose is hereby granted without fee, provided * that the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the names of Network Computing Devices, or Digital * not be used in advertising or publicity pertaining to distribution * of the software without specific, written prior permission. * * NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES, * OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF * THIS SOFTWARE. */ /* $XFree86: xc/programs/xfs/os/utils.c,v 3.20 2002/10/15 01:45:03 dawes Exp $ */ #include #include #include #include "misc.h" #include "globals.h" #include #ifdef MEMBUG #include #endif #include #include #include #include #include #include #include #include #ifndef X_NOT_POSIX #ifdef _POSIX_SOURCE #include #else #define _POSIX_SOURCE #include #undef _POSIX_SOURCE #endif #endif /* X_NOT_POSIX */ #ifndef PATH_MAX #include #ifndef PATH_MAX #ifdef MAXPATHLEN #define PATH_MAX MAXPATHLEN #else #define PATH_MAX 1024 #endif #endif #endif /* PATH_MAX */ #if defined(X_NOT_POSIX) && (defined(SYSV) || defined(SVR4)) #define SIGNALS_RESET_WHEN_CAUGHT #endif #include extern char *configfilename; static Bool dropPriv = FALSE; /* whether or not to drop root privileges */ #ifdef DEFAULT_DAEMON static Bool becomeDaemon = TRUE; /* whether to become a daemon or not */ #else static Bool becomeDaemon = FALSE; /* whether to become a daemon or not */ #endif static const char *userId = NULL; char *progname; Bool CloneSelf; Bool portFromCmdline = FALSE; OldListenRec *OldListen = NULL; int OldListenCount = 0; #ifdef STDERR_FILENO # define WRITES write(STDERR_FILENO, s, strlen(s)) #else # define WRITES write(fileno(stderr), s, strlen(s)) #endif static char *pidFile = XFSPIDDIR "/xfs.pid"; static int pidFd; static FILE *pidFilePtr; static int StorePid (void); /* ARGSUSED */ SIGVAL AutoResetServer(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a reset signal\n"); #endif dispatchException |= DE_RESET; isItTimeToYield = TRUE; #ifdef SIGNALS_RESET_WHEN_CAUGHT signal(SIGHUP, AutoResetServer); #endif errno = olderrno; } /* ARGSUSED */ SIGVAL GiveUp(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a TERM signal\n"); #endif dispatchException |= DE_TERMINATE; isItTimeToYield = TRUE; errno = olderrno; } /* ARGSUSED */ SIGVAL ServerReconfig(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a re-config signal\n"); #endif dispatchException |= DE_RECONFIG; isItTimeToYield = TRUE; #ifdef SIGNALS_RESET_WHEN_CAUGHT signal(SIGUSR1, ServerReconfig); #endif errno = olderrno; } /* ARGSUSED */ SIGVAL ServerCacheFlush(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a flush signal\n"); #endif dispatchException |= DE_FLUSH; isItTimeToYield = TRUE; #ifdef SIGNALS_RESET_WHEN_CAUGHT signal(SIGUSR2, ServerCacheFlush); #endif errno = olderrno; } /* ARGSUSED */ SIGVAL CleanupChild(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a child signal\n"); #endif wait(NULL); #ifdef SIGNALS_RESET_WHEN_CAUGHT signal(SIGCHLD, CleanupChild); #endif errno = olderrno; } long GetTimeInMillis(void) { struct timeval tp; X_GETTIMEOFDAY(&tp); return ((tp.tv_sec * 1000) + (tp.tv_usec / 1000)); } static void usage(void) { fprintf(stderr, "usage: %s [-config config_file] [-port tcp_port] [-droppriv] [-daemon] [-nodaemon] [-user user_name] [-ls listen_socket]\n", progname); exit(1); } void OsInitAllocator (void) { #ifdef MEMBUG CheckMemory (); #endif } /* * The '-ls' option is used for cloning the font server. * * We expect a single string of the form... * * transport_id/fd/portnum[,transport_id/fd/portnum]... * * [] denotes optional and ... denotes repitition. * * The string must be _exactly_ in the above format. */ void ProcessLSoption (char *str) { char *ptr = str; char *slash; char number[20]; int count = 0; int len, i; while (*ptr != '\0') { if (*ptr == ',') count++; ptr++; } OldListenCount = count + 1; OldListen = (OldListenRec *) malloc ( OldListenCount * sizeof (OldListenRec)); if (OldListen == NULL) { fprintf(stderr, "ProcessLSoption: malloc error\n"); exit(1); } ptr = str; for (i = 0; i < OldListenCount; i++) { slash = (char *) strchr (ptr, '/'); if (slash == NULL) { usage(); } len = slash - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].trans_id = atoi (number); ptr = slash + 1; slash = (char *) strchr (ptr, '/'); if (slash == NULL) { usage(); } len = slash - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].fd = atoi (number); ptr = slash + 1; if (i == OldListenCount - 1) OldListen[i].portnum = atoi (ptr); else { char *comma = (char *) strchr (ptr, ','); if (comma == NULL) { usage(); } len = comma - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].portnum = atoi (number); ptr = comma + 1; } } } /* ARGSUSED */ void ProcessCmdLine(int argc, char **argv) { int i; progname = argv[0]; for (i = 1; i < argc; i++) { if (!strcmp(argv[i], "-port")) { if (argv[i + 1]) { ListenPort = atoi(argv[++i]); portFromCmdline = TRUE; } else usage(); } else if (!strcmp(argv[i], "-ls")) { if (argv[i + 1]) ProcessLSoption (argv[++i]); else usage(); } else if (!strcmp(argv[i], "-droppriv")) { dropPriv = TRUE; } else if (!strcmp(argv[i], "-daemon")) { becomeDaemon = TRUE; } else if (!strcmp(argv[i], "-nodaemon")) { becomeDaemon = FALSE; } else if (!strcmp(argv[i], "-user")) { if (argv[i + 1]) userId = argv[++i]; else usage(); } else if (!strcmp(argv[i], "-cf") || !strcmp(argv[i], "-config")) { if (argv[i + 1]) configfilename = argv[++i]; else usage(); } #ifdef MEMBUG else if ( strcmp( argv[i], "-alloc") == 0) { extern unsigned long MemoryFail; if(++i < argc) MemoryFail = atoi(argv[i]); else usage (); } #endif else usage(); } } #ifndef SPECIAL_MALLOC unsigned long Must_have_memory; #ifdef MEMBUG #define MEM_FAIL_SCALE 100000 unsigned long MemoryFail; #endif /* FSalloc -- FS's internal memory allocator. Why does it return unsigned * int * instead of the more common char *? Well, if you read K&R you'll * see they say that alloc must return a pointer "suitable for conversion" * to whatever type you really want. In a full-blown generic allocator * there's no way to solve the alignment problems without potentially * wasting lots of space. But we have a more limited problem. We know * we're only ever returning pointers to structures which will have to * be long word aligned. So we are making a stronger guarantee. It might * have made sense to make FSalloc return char * to conform with people's * expectations of malloc, but this makes lint happier. */ pointer FSalloc (unsigned long amount) { register pointer ptr; if ((long)amount < 0) return 0; if (amount == 0) amount++; /* aligned extra on long word boundary */ amount = (amount + 3) & ~3; #ifdef MEMBUG if (!Must_have_memory && MemoryFail && ((random() % MEM_FAIL_SCALE) < MemoryFail)) return 0; if (ptr = (pointer)fmalloc(amount)) return ptr; #else if ((ptr = (pointer)malloc(amount)) != 0) return ptr; #endif if (Must_have_memory) FatalError("out of memory\n"); return 0; } /***************** * FScalloc *****************/ pointer FScalloc (unsigned long amount) { pointer ret; ret = FSalloc (amount); if (ret) bzero ((char *) ret, (int) amount); return ret; } /***************** * FSrealloc *****************/ pointer FSrealloc (pointer ptr, unsigned long amount) { #ifdef MEMBUG if (!Must_have_memory && MemoryFail && ((random() % MEM_FAIL_SCALE) < MemoryFail)) return 0; ptr = (pointer)frealloc((char *) ptr, amount); if (ptr) return ptr; #else if ((long)amount <= 0) { if (ptr && !amount) free(ptr); return 0; } amount = (amount + 3) & ~3; if (ptr) ptr = (pointer)realloc((char *)ptr, amount); else ptr = (pointer)malloc(amount); if (ptr) return ptr; #endif if (Must_have_memory) FatalError("out of memory\n"); return 0; } /***************** * FSfree * calls free *****************/ void FSfree(pointer ptr) { #ifdef MEMBUG if (ptr) ffree((char *)ptr); #else if (ptr) free((char *)ptr); #endif } #endif /* SPECIAL_MALLOC */ void SetUserId(void) { /* become xfs user (or other specified on command line) if possible */ if ((geteuid() == 0) && (dropPriv || userId)) { const char *user; struct passwd *pwent; if (!userId) user = "xfs"; else user = userId; pwent = getpwnam(user); if (pwent) { if (setgid(pwent->pw_gid)) { FatalError("fatal: couldn't set groupid to xfs user's group\n"); } #ifndef QNX4 #ifndef __CYGWIN__ if (setgroups(0, NULL)) { FatalError("fatal: couldn't drop supplementary groups\n"); } #endif if (initgroups(user, pwent->pw_gid)) { FatalError("fatal: couldn't init supplementary groups\n"); } #endif /* QNX4 */ if (setuid(pwent->pw_uid)) { FatalError("fatal: couldn't set userid to %s user\n", user); } } } else if (dropPriv || userId) { FatalError("fatal: -droppriv or -user flag specified, but xfs not run as root\n"); } } void SetDaemonState(void) { int oldpid; if (becomeDaemon) { BecomeOrphan(); BecomeDaemon(); if ((oldpid = StorePid ())) { if (oldpid == -1) ErrorF ("error opening process-id file %s\n", pidFile); else ErrorF ("process-id file %s indicates another xfs is " "running (pid %d); exiting\n", pidFile, oldpid); exit(1); } } } static int StorePid (void) { int oldpid; if (pidFile[0] != '\0') { pidFd = open (pidFile, O_RDWR); if (pidFd == -1 && errno == ENOENT) pidFd = open (pidFile, O_RDWR|O_CREAT, 0666); if (pidFd == -1 || !(pidFilePtr = fdopen (pidFd, "r+"))) { ErrorF ("cannot open process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } if (fscanf (pidFilePtr, "%d\n", &oldpid) != 1) oldpid = -1; if (fseek (pidFilePtr, 0L, SEEK_SET) == -1) { ErrorF ("cannot seek process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } if (fprintf (pidFilePtr, "%5ld\n", (long) getpid ()) != 6) { ErrorF ("cannot write to process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } (void) fflush (pidFilePtr); (void) fclose (pidFilePtr); } return 0; }