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763 lines
15 KiB
763 lines
15 KiB
/*
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Copyright 1988, 1998 The Open Group
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Copyright 2001-2004 Oswald Buddenhagen <ossi@kde.org>
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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
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of a copyright holder shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the copyright holder.
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*/
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/*
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* xdm - display manager daemon
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* Author: Keith Packard, MIT X Consortium
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*
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* subdaemon and external process management and communication
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*/
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#include "dm.h"
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#include "dm_error.h"
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#include <ctype.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <signal.h>
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#include <unistd.h>
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#ifdef _POSIX_PRIORITY_SCHEDULING
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# include <sched.h>
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#endif
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extern char **environ;
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SIGFUNC Signal( int sig, SIGFUNC handler )
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{
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#ifndef __EMX__
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struct sigaction sigact, osigact;
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sigact.sa_handler = handler;
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sigemptyset( &sigact.sa_mask );
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# ifdef SA_RESTART
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sigact.sa_flags = SA_RESTART;
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# else
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sigact.sa_flags = 0;
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# endif
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sigaction( sig, &sigact, &osigact );
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return osigact.sa_handler;
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#else
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return signal( sig, handler );
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#endif
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}
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void
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TerminateProcess( int pid, int sig )
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{
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kill( pid, sig );
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#ifdef SIGCONT
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kill( pid, SIGCONT );
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#endif
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}
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static FD_TYPE CloseMask;
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static int max = -1;
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void
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RegisterCloseOnFork( int fd )
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{
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FD_SET( fd, &CloseMask );
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if (fd > max)
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max = fd;
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}
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void
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ClearCloseOnFork( int fd )
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{
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FD_CLR( fd, &CloseMask );
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}
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void
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CloseNClearCloseOnFork( int fd )
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{
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close( fd );
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FD_CLR( fd, &CloseMask );
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}
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static void
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CloseOnFork( void )
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{
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int fd;
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for (fd = 0; fd <= max; fd++)
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if (FD_ISSET( fd, &CloseMask ))
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close( fd );
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FD_ZERO( &CloseMask );
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max = -1;
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}
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int
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Fork()
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{
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int pid;
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sigset_t ss, oss;
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sigfillset( &ss );
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sigprocmask( SIG_SETMASK, &ss, &oss );
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if (!(pid = fork())) {
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#ifdef SIGCHLD
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(void)Signal( SIGCHLD, SIG_DFL );
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#endif
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(void)Signal( SIGTERM, SIG_DFL );
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(void)Signal( SIGINT, SIG_IGN ); /* for -nodaemon */
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(void)Signal( SIGPIPE, SIG_DFL );
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(void)Signal( SIGALRM, SIG_DFL );
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(void)Signal( SIGHUP, SIG_DFL );
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sigemptyset( &ss );
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sigprocmask( SIG_SETMASK, &ss, NULL );
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CloseOnFork();
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return 0;
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}
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sigprocmask( SIG_SETMASK, &oss, 0 );
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return pid;
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}
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int
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Wait4( int pid )
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{
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waitType result;
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while (waitpid( pid, &result, 0 ) < 0)
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if (errno != EINTR) {
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Debug( "Wait4(%d) failed: %m\n", pid );
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return 0;
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}
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return waitVal( result );
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}
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void
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execute( char **argv, char **env )
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{
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Debug( "execute: %[s ; %[s\n", argv, env );
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execve( argv[0], argv, env );
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/*
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* In case this is a shell script which hasn't been
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* made executable (or this is a SYSV box), do
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* a reasonable thing
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*/
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if (errno != ENOENT) {
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char **newargv;
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FILE *f;
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int nu;
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char program[1024];
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/*
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* emulate BSD kernel behaviour -- read
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* the first line; check if it starts
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* with "#!", in which case it uses
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* the rest of the line as the name of
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* program to run. Else use "/bin/sh".
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*/
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if (!(f = fopen( argv[0], "r" )))
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return;
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if (!fGets( program, sizeof(program), f )) {
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fclose( f );
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return;
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}
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fclose( f );
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if (!strncmp( program, "#!", 2 ))
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newargv = parseArgs( 0, program + 2 );
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else
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newargv = addStrArr( 0, "/bin/sh", 7 );
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if (!newargv)
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return;
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nu = arrLen( newargv );
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if (!(argv = xCopyStrArr( nu, argv )))
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return;
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memcpy( argv, newargv, sizeof(char *) * nu );
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Debug( "shell script execution: %[s\n", argv );
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execve( argv[0], argv, env );
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}
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}
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int
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runAndWait( char **args, char **env )
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{
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int pid, ret;
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switch (pid = Fork()) {
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case 0:
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execute( args, env );
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LogError( "Can't execute %\"s: %m\n", args[0] );
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exit( 127 );
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case -1:
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LogError( "Can't fork to execute %\"s: %m\n", args[0] );
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return 1;
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}
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ret = Wait4( pid );
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return waitVal( ret );
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}
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FILE *
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pOpen( char **what, char m, int *pid )
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{
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int dp[2];
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if (pipe( dp ))
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return 0;
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switch ((*pid = Fork())) {
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case 0:
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if (m == 'r')
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dup2( dp[1], 1 );
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else
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dup2( dp[0], 0 );
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close( dp[0] );
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close( dp[1] );
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execute( what, environ );
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LogError( "Can't execute %\"s: %m\n", what[0] );
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exit( 127 );
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case -1:
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close( dp[0] );
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close( dp[1] );
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LogError( "Can't fork to execute %\"s: %m\n", what[0] );
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return 0;
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}
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if (m == 'r') {
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close( dp[1] );
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return fdopen( dp[0], "r" );
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} else {
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close( dp[0] );
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return fdopen( dp[1], "w" );
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}
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}
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int
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pClose( FILE *f, int pid )
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{
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fclose( f );
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return Wait4( pid );
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}
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char *
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locate( const char *exe )
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{
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int len;
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char *path, *name, *thenam, nambuf[PATH_MAX+1];
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char *pathe;
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if (!(path = getenv( "PATH" ))) {
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LogError( "Can't execute %'s: $PATH not set.\n", exe );
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return 0;
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}
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len = strlen( exe );
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name = nambuf + PATH_MAX - len;
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memcpy( name, exe, len + 1 );
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*--name = '/';
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do {
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if (!(pathe = (char*)strchr( path, ':' )))
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pathe = path + strlen( path );
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len = pathe - path;
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if (len && !(len == 1 && *path == '.')) {
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thenam = name - len;
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if (thenam >= nambuf) {
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memcpy( thenam, path, len );
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if (!access( thenam, X_OK )) {
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StrDup( &name, thenam );
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return name;
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}
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}
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}
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path = pathe;
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} while (*path++ != '\0');
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LogError( "Can't execute %'s: not in $PATH.\n", exe );
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return 0;
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}
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static GTalk *curtalk;
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void
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GSet( GTalk *tlk )
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{
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curtalk = tlk;
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}
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int
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GFork( GPipe *pajp, const char *pname, char *cname,
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GPipe *ogp, char *cgname )
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{
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int opipe[2], ipipe[2], ogpipe[2], igpipe[2], pid;
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if (pipe( opipe ))
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goto badp1;
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if (pipe( ipipe ))
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goto badp2;
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if (ogp) {
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if (pipe( ogpipe ))
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goto badp3;
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if (pipe( igpipe )) {
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close( ogpipe[0] );
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close( ogpipe[1] );
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badp3:
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close( ipipe[0] );
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close( ipipe[1] );
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badp2:
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close( opipe[0] );
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close( opipe[1] );
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badp1:
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LogError( "Cannot start %s, pipe() failed", cname );
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if (cname)
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free( cname );
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return -1;
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}
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}
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RegisterCloseOnFork( opipe[1] );
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RegisterCloseOnFork( ipipe[0] );
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if (ogp) {
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RegisterCloseOnFork( ogpipe[1] );
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RegisterCloseOnFork( igpipe[0] );
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}
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switch (pid = Fork()) {
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case -1:
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close( opipe[0] );
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close( ipipe[1] );
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CloseNClearCloseOnFork( opipe[1] );
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CloseNClearCloseOnFork( ipipe[0] );
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if (ogp) {
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close( ogpipe[0] );
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close( igpipe[1] );
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CloseNClearCloseOnFork( ogpipe[1] );
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CloseNClearCloseOnFork( igpipe[0] );
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}
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LogError( "Cannot start %s, fork() failed\n", cname );
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if (cname)
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free( cname );
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return -1;
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case 0:
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pajp->wfd = ipipe[1];
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RegisterCloseOnFork( ipipe[1] );
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pajp->rfd = opipe[0];
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RegisterCloseOnFork( opipe[0] );
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pajp->who = (char *)pname;
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if (ogp) {
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ogp->wfd = igpipe[1];
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RegisterCloseOnFork( igpipe[1] );
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ogp->rfd = ogpipe[0];
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RegisterCloseOnFork( ogpipe[0] );
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ogp->who = (char *)pname;
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}
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break;
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default:
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close( opipe[0] );
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close( ipipe[1] );
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pajp->rfd = ipipe[0];
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pajp->wfd = opipe[1];
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pajp->who = cname;
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if (ogp) {
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close( ogpipe[0] );
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close( igpipe[1] );
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ogp->rfd = igpipe[0];
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ogp->wfd = ogpipe[1];
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ogp->who = cgname;
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}
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break;
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}
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return pid;
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}
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int
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GOpen( GProc *proc, char **argv, const char *what, char **env, char *cname,
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GPipe *gp )
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{
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char **margv;
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int pip[2];
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char coninfo[32];
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/* ### GSet (proc->pipe); */
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if (proc->pid) {
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LogError( "%s already running\n", cname );
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if (cname)
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free( cname );
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return -1;
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}
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if (!(margv = xCopyStrArr( 1, argv ))) {
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if (cname)
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free( cname );
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return -1;
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}
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if (!StrApp( margv, progpath, what, (char *)0 )) {
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free( margv );
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if (cname)
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free( cname );
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return -1;
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}
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if (pipe( pip )) {
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LogError( "Cannot start %s, pipe() failed\n", cname );
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if (cname)
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free( cname );
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goto fail;
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}
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if (gp) {
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ClearCloseOnFork( gp->rfd );
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ClearCloseOnFork( gp->wfd );
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}
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proc->pid = GFork( &proc->pipe, 0, cname, 0, 0 );
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if (proc->pid) {
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close( pip[1] );
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if (gp) {
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RegisterCloseOnFork( gp->rfd );
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RegisterCloseOnFork( gp->wfd );
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}
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}
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switch (proc->pid) {
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case -1:
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fail1:
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close( pip[0] );
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fail:
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free( margv[0] );
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free( margv );
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return -1;
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case 0:
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(void)Signal( SIGPIPE, SIG_IGN );
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close( pip[0] );
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fcntl( pip[1], F_SETFD, FD_CLOEXEC );
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if (gp)
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sprintf( coninfo, "CONINFO=%d %d %d %d",
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proc->pipe.rfd, proc->pipe.wfd, gp->rfd, gp->wfd );
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else
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sprintf( coninfo, "CONINFO=%d %d",
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proc->pipe.rfd, proc->pipe.wfd );
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env = putEnv( coninfo, env );
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if (debugLevel & DEBUG_VALGRIND) {
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char **nmargv = xCopyStrArr( 1, margv );
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nmargv[0] = locate( "valgrind" );
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execute( nmargv, env );
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} else if (debugLevel & DEBUG_STRACE) {
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char **nmargv = xCopyStrArr( 1, margv );
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nmargv[0] = locate( "strace" );
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execute( nmargv, env );
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} else
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execute( margv, env );
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write( pip[1], "", 1 );
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exit( 1 );
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default:
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(void)Signal( SIGPIPE, SIG_IGN );
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if (Reader( pip[0], coninfo, 1 )) {
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Wait4( proc->pid );
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LogError( "Cannot execute %\"s (%s)\n", margv[0], cname );
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GClosen (&proc->pipe);
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goto fail1;
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}
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close( pip[0] );
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Debug( "started %s (%\"s), pid %d\n", cname, margv[0], proc->pid );
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free( margv[0] );
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free( margv );
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GSendInt( debugLevel );
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return 0;
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}
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}
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|
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static void
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iGClosen( GPipe *pajp )
|
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{
|
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CloseNClearCloseOnFork( pajp->rfd );
|
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CloseNClearCloseOnFork( pajp->wfd );
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pajp->rfd = pajp->wfd = -1;
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}
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|
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void
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GClosen (GPipe *pajp)
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{
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iGClosen( pajp );
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if (pajp->who)
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free( pajp->who );
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pajp->who = 0;
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}
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|
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int
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GClose (GProc *proc, GPipe *gp, int force)
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{
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int ret;
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|
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if (!proc->pid) {
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Debug( "whoops, GClose while helper not running\n" );
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return 0;
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}
|
|
iGClosen( &proc->pipe );
|
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if (gp)
|
|
GClosen (gp);
|
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if (force)
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TerminateProcess( proc->pid, SIGTERM );
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ret = Wait4( proc->pid );
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proc->pid = 0;
|
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if (WaitSig( ret ) ? WaitSig( ret ) != SIGTERM :
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(WaitCode( ret ) < EX_NORMAL || WaitCode( ret ) > EX_MAX))
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|
LogError( "Abnormal termination of %s, code %d, signal %d\n",
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proc->pipe.who, WaitCode( ret ), WaitSig( ret ) );
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Debug( "closed %s\n", proc->pipe.who );
|
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if (proc->pipe.who)
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free( proc->pipe.who );
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proc->pipe.who = 0;
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return ret;
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}
|
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|
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static void ATTR_NORETURN
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|
GErr( void )
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|
{
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|
Longjmp( curtalk->errjmp, 1 );
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|
}
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|
|
static void
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|
GRead( void *buf, int len )
|
|
{
|
|
if (Reader( curtalk->pipe->rfd, buf, len ) != len) {
|
|
LogError( "Cannot read from %s\n", curtalk->pipe->who );
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GErr();
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}
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}
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|
|
static void
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|
GWrite( const void *buf, int len )
|
|
{
|
|
if (Writer( curtalk->pipe->wfd, buf, len ) != len) {
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LogError( "Cannot write to %s\n", curtalk->pipe->who );
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GErr();
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}
|
|
#ifdef _POSIX_PRIORITY_SCHEDULING
|
|
if ((debugLevel & DEBUG_HLPCON))
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|
sched_yield();
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|
#endif
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|
}
|
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|
|
void
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|
GSendInt( int val )
|
|
{
|
|
GDebug( "sending int %d (%#x) to %s\n", val, val, curtalk->pipe->who );
|
|
GWrite( &val, sizeof(val) );
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|
}
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|
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int
|
|
GRecvInt()
|
|
{
|
|
int val;
|
|
|
|
GDebug( "receiving int from %s ...\n", curtalk->pipe->who );
|
|
GRead( &val, sizeof(val) );
|
|
GDebug( " -> %d (%#x)\n", val, val );
|
|
return val;
|
|
}
|
|
|
|
int
|
|
GRecvCmd( int *cmd )
|
|
{
|
|
GDebug( "receiving command from %s ...\n", curtalk->pipe->who );
|
|
if (Reader( curtalk->pipe->rfd, cmd, sizeof(*cmd) ) == sizeof(*cmd)) {
|
|
GDebug( " -> %d\n", *cmd );
|
|
return 1;
|
|
}
|
|
GDebug( " -> no data\n" );
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
GSendArr( int len, const char *data )
|
|
{
|
|
GDebug( "sending array[%d] %02[*{hhx to %s\n",
|
|
len, len, data, curtalk->pipe->who );
|
|
GWrite( &len, sizeof(len) );
|
|
GWrite( data, len );
|
|
}
|
|
|
|
static char *
|
|
iGRecvArr( int *rlen )
|
|
{
|
|
int len;
|
|
char *buf;
|
|
|
|
GRead( &len, sizeof(len) );
|
|
*rlen = len;
|
|
GDebug( " -> %d bytes\n", len );
|
|
if (!len)
|
|
return (char *)0;
|
|
if (!(buf = Malloc( len )))
|
|
GErr();
|
|
GRead( buf, len );
|
|
return buf;
|
|
}
|
|
|
|
char *
|
|
GRecvArr( int *rlen )
|
|
{
|
|
char *buf;
|
|
|
|
GDebug( "receiving array from %s ...\n", curtalk->pipe->who );
|
|
buf = iGRecvArr( rlen );
|
|
GDebug( " -> %02[*{hhx\n", *rlen, buf );
|
|
return buf;
|
|
}
|
|
|
|
static int
|
|
iGRecvArrBuf( char *buf )
|
|
{
|
|
int len;
|
|
|
|
GRead( &len, sizeof(len) );
|
|
GDebug( " -> %d bytes\n", len );
|
|
if (len)
|
|
GRead( buf, len );
|
|
return len;
|
|
}
|
|
|
|
int
|
|
GRecvArrBuf( char *buf )
|
|
{
|
|
int len;
|
|
|
|
GDebug( "receiving already allocated array from %s ...\n",
|
|
curtalk->pipe->who );
|
|
len = iGRecvArrBuf( buf );
|
|
GDebug( " -> %02[*{hhx\n", len, buf );
|
|
return len;
|
|
}
|
|
|
|
int
|
|
GRecvStrBuf( char *buf )
|
|
{
|
|
int len;
|
|
|
|
GDebug( "receiving already allocated string from %s ...\n",
|
|
curtalk->pipe->who );
|
|
len = iGRecvArrBuf( buf );
|
|
GDebug( " -> %\".*s\n", len, buf );
|
|
return len;
|
|
}
|
|
|
|
void
|
|
GSendStr( const char *buf )
|
|
{
|
|
int len;
|
|
|
|
GDebug( "sending string %\"s to %s\n", buf, curtalk->pipe->who );
|
|
if (buf) {
|
|
len = strlen( buf ) + 1;
|
|
GWrite( &len, sizeof(len) );
|
|
GWrite( buf, len );
|
|
} else
|
|
GWrite( &buf, sizeof(int) );
|
|
}
|
|
|
|
void
|
|
GSendNStr( const char *buf, int len )
|
|
{
|
|
int tlen = len + 1;
|
|
GDebug( "sending string %\".*s to %s\n", len, buf, curtalk->pipe->who );
|
|
GWrite( &tlen, sizeof(tlen) );
|
|
GWrite( buf, len );
|
|
GWrite( "", 1 );
|
|
}
|
|
|
|
void
|
|
GSendStrN( const char *buf, int len )
|
|
{
|
|
if (buf)
|
|
GSendNStr( buf, StrNLen( buf, len ) );
|
|
else
|
|
GSendStr( buf );
|
|
}
|
|
|
|
char *
|
|
GRecvStr()
|
|
{
|
|
int len;
|
|
char *buf;
|
|
|
|
GDebug( "receiving string from %s ...\n", curtalk->pipe->who );
|
|
buf = iGRecvArr( &len );
|
|
GDebug( " -> %\".*s\n", len, buf );
|
|
return buf;
|
|
}
|
|
|
|
static void
|
|
iGSendStrArr( int num, char **data )
|
|
{
|
|
char **cdata;
|
|
|
|
GWrite( &num, sizeof(num) );
|
|
for (cdata = data; --num >= 0; cdata++)
|
|
GSendStr( *cdata );
|
|
}
|
|
|
|
/*
|
|
void
|
|
GSendStrArr (int num, char **data)
|
|
{
|
|
GDebug( "sending string array[%d] to %s\n", num, curtalk->pipe->who );
|
|
iGSendStrArr( num, data );
|
|
}
|
|
*/
|
|
|
|
char **
|
|
GRecvStrArr( int *rnum )
|
|
{
|
|
int num;
|
|
char **argv, **cargv;
|
|
|
|
GDebug( "receiving string array from %s ...\n", curtalk->pipe->who );
|
|
GRead( &num, sizeof(num) );
|
|
GDebug( " -> %d strings\n", num );
|
|
*rnum = num;
|
|
if (!num)
|
|
return (char **)0;
|
|
if (!(argv = Malloc( num * sizeof(char *) )))
|
|
GErr();
|
|
for (cargv = argv; --num >= 0; cargv++)
|
|
*cargv = GRecvStr();
|
|
return argv;
|
|
}
|
|
|
|
void
|
|
GSendArgv( char **argv )
|
|
{
|
|
int num;
|
|
|
|
if (argv) {
|
|
for (num = 0; argv[num]; num++);
|
|
GDebug( "sending argv[%d] to %s ...\n", num, curtalk->pipe->who );
|
|
iGSendStrArr( num + 1, argv );
|
|
} else {
|
|
GDebug( "sending NULL argv to %s\n", curtalk->pipe->who );
|
|
GWrite( &argv, sizeof(int) );
|
|
}
|
|
}
|
|
|
|
char **
|
|
GRecvArgv()
|
|
{
|
|
int num;
|
|
|
|
return GRecvStrArr( &num );
|
|
}
|
|
|