src/hwinfo/hwscanqueue.c

   1
   2 /* hwscan front end
   3    Copyright 2004 by SUSE (<adrian@suse.de>) */
   4
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <sys/ipc.h>
   8 #include <sys/msg.h>
   9 #include <signal.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <stdio.h>
  15
  16 #include "init_message.h"
  17
  18 int main( int argc, char **argv )
  19 {
  20         int ret;
  21         unsigned short i;
  22         key_t key = KEY;
  23         int msgid;
  24         message m;
  25         char *device = argv[2];
  26
  27         if ( argc < 2 ){
  28                 fprintf( stderr, "help: hwscanqueue hwscan-commands\n" );
  29                 fprintf( stderr, "help: commands:\n" );
  30                 for ( i=0; i<NR_COMMANDS; i++ ){
  31                         fprintf( stderr, "      --%s", command_args[i]  );
  32                         if ( command_with_device[i] )
  33                                 fprintf( stderr, " device" );
  34                         fprintf( stderr, "\n");
  35                 }
  36                 fprintf( stderr, "      --avail=yes/no id\n" );
  37                 fprintf( stderr, "      --scan=device\n" );
  38                 fprintf( stderr, "      --stop=device\n" );
  39                 exit(1);
  40         }
  41
  42         if ( !strncmp("--cfg=", argv[1], 6) && argc>2 )
  43                 snprintf( m.mtext, MESSAGE_BUFFER, "C/sbin/hwscan %s %s", argv[1], argv[2]  );
  44         else if ( !strncmp("--avail=", argv[1], 8) && argc>2 )
  45                 snprintf( m.mtext, MESSAGE_BUFFER, "C/sbin/hwscan %s %s", argv[1], argv[2]  );
  46         else if ( !strncmp("--scan=", argv[1], 7) )
  47                 snprintf( m.mtext, MESSAGE_BUFFER, "A%s", argv[1]+7 );
  48         else if ( !strncmp("--stop=", argv[1], 7) )
  49                 snprintf( m.mtext, MESSAGE_BUFFER, "R%s", argv[1]+7 );
  50         else if ( !strncmp("--", argv[1], 2) ){
  51                 for ( i=0; i<NR_COMMANDS; i++ ){
  52                         if ( !strcmp(argv[1]+2,command_args[i]) ){
  53 #if DEBUG
  54                                 printf("COMMAND %s\n", command_args[i] );
  55 #endif
  56                                 snprintf( m.mtext, MESSAGE_BUFFER, "S%d", i );
  57                                 if (command_with_device[i]){
  58                                         if ( !device ){
  59                                                 fprintf(stderr, "need a device for this command\n");
  60                                                 exit(1);
  61                                         }
  62                                         strncat( m.mtext, device, MESSAGE_BUFFER-3 );
  63                                 }
  64                                 break;
  65                         }
  66                 }
  67                 if ( i>=NR_COMMANDS ){
  68                         fprintf(stderr, "unknown command\n");
  69                         exit(1);
  70                 }
  71         }else
  72                 exit(1);
  73
  74         if ( (msgid = msgget(key, IPC_CREAT | 0600)) < 0 ){
  75                 perror("unable to init.");
  76                 exit(1);
  77         }
  78         m.mtype = 1;
  79         ret = msgsnd( msgid, &m, MESSAGE_BUFFER, IPC_NOWAIT);
  80 #if DEBUG
  81         printf("SEND %s, return %d\n", m.mtext, ret );
  82 #endif
  83
  84         if ( ret < 0 )
  85                 perror("message send failed");
  86         else{
  87                 // success ... start hwscand, if it is not yet running
  88                 ssize_t r;
  89                 char buffer[1024];
  90                 char link[1024];
  91                 int fd = open( PID_FILE, O_RDONLY );
  92                 if ( fd >= 0 && (r=read(fd,buffer,1023)) > 0 ){
  93                         close(fd);
  94                         buffer[r]='\0';
  95                         snprintf(link, 1023, "/proc/%s/exe", buffer);
  96                         if ( (r=readlink( link, buffer, 1023 )) > 0 ){
  97                                 buffer[r]='\0';
  98                                 if ( r<8 )
  99                                         fd=-1;
 100                                 else if ( strcmp("/hwscand", buffer+strlen(buffer)-8) )
 101                                         fd=-1;
 102                         }else
 103                                 fd=-1;
 104                 }else
 105                         fd=-1;
 106
 107                 if ( fd < 0 ){
 108                         pid_t pid;
 109                         signal(SIGCHLD,SIG_IGN);
 110                         pid=fork();
 111                         if (pid==0){
 112                                 /* Change directory to allow clean shut-down */
 113                                 chdir("/");
 114                                 /* Close std fds */
 115                                 close(0);
 116                                 close(1);
 117                                 close(2);
 118                                 /* Start hwscand */
 119                                 execve("/sbin/hwscand", 0, 0);
 120                         }
 121                 }
 122         }
 123
 124         exit(ret);
 125 }
 126