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/* hwscan front end
Copyright 2004 by SUSE (<adrian@suse.de>) */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "init_message.h"
int main( int argc, char **argv )
{
int ret;
unsigned short i;
key_t key = KEY;
int msgid;
message m;
char *device = argv[2];
if ( argc < 2 ){
fprintf( stderr, "help: hwscanqueue hwscan-commands\n" );
fprintf( stderr, "help: commands:\n" );
for ( i=0; i<NR_COMMANDS; i++ ){
fprintf( stderr, " --%s", command_args[i] );
if ( command_with_device[i] )
fprintf( stderr, " device" );
fprintf( stderr, "\n");
}
fprintf( stderr, " --avail=yes/no id\n" );
fprintf( stderr, " --scan=device\n" );
fprintf( stderr, " --stop=device\n" );
exit(1);
}
if ( !strncmp("--cfg=", argv[1], 6) && argc>2 )
snprintf( m.mtext, MESSAGE_BUFFER, "C/sbin/hwscan %s %s", argv[1], argv[2] );
else if ( !strncmp("--avail=", argv[1], 8) && argc>2 )
snprintf( m.mtext, MESSAGE_BUFFER, "C/sbin/hwscan %s %s", argv[1], argv[2] );
else if ( !strncmp("--scan=", argv[1], 7) )
snprintf( m.mtext, MESSAGE_BUFFER, "A%s", argv[1]+7 );
else if ( !strncmp("--stop=", argv[1], 7) )
snprintf( m.mtext, MESSAGE_BUFFER, "R%s", argv[1]+7 );
else if ( !strncmp("--", argv[1], 2) ){
for ( i=0; i<NR_COMMANDS; i++ ){
if ( !strcmp(argv[1]+2,command_args[i]) ){
#if DEBUG
printf("COMMAND %s\n", command_args[i] );
#endif
snprintf( m.mtext, MESSAGE_BUFFER, "S%d", i );
if (command_with_device[i]){
if ( !device ){
fprintf(stderr, "need a device for this command\n");
exit(1);
}
strncat( m.mtext, device, MESSAGE_BUFFER-3 );
}
break;
}
}
if ( i>=NR_COMMANDS ){
fprintf(stderr, "unknown command\n");
exit(1);
}
}else
exit(1);
if ( (msgid = msgget(key, IPC_CREAT | 0600)) < 0 ){
perror("unable to init.");
exit(1);
}
m.mtype = 1;
ret = msgsnd( msgid, &m, MESSAGE_BUFFER, IPC_NOWAIT);
#if DEBUG
printf("SEND %s, return %d\n", m.mtext, ret );
#endif
if ( ret < 0 )
perror("message send failed");
else{
// success ... start hwscand, if it is not yet running
ssize_t r;
char buffer[1024];
char link[1024];
int fd = open( PID_FILE, O_RDONLY );
if ( fd >= 0 && (r=read(fd,buffer,1023)) > 0 ){
close(fd);
buffer[r]='\0';
snprintf(link, 1023, "/proc/%s/exe", buffer);
if ( (r=readlink( link, buffer, 1023 )) > 0 ){
buffer[r]='\0';
if ( r<8 )
fd=-1;
else if ( strcmp("/hwscand", buffer+strlen(buffer)-8) )
fd=-1;
}else
fd=-1;
}else
fd=-1;
if ( fd < 0 ){
pid_t pid;
signal(SIGCHLD,SIG_IGN);
pid=fork();
if (pid==0){
/* Change directory to allow clean shut-down */
chdir("/");
/* Close std fds */
close(0);
close(1);
close(2);
/* Start hwscand */
execve("/sbin/hwscand", 0, 0);
}
}
}
exit(ret);
}
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