deq.c

实现一个多进程的作业控制系统

#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ipc.h>
#include <fcntl.h>
#include "job.h"

/* 
 * command syntax
 *     deq jid
 */
void usage()
{
  printf("Usage:  deq jid\n"
	 "\tjid\t\t the job id\n");
}

int main(int argc,char *argv[])
{
  struct jobcmd deqcmd;
  int fd;

  if (argc != 2) {
    usage();
    return 1;
  }
  
  deqcmd.type = DEQ;
  deqcmd.defpri = 0;
  deqcmd.owner = getuid();
  deqcmd.argnum = 1;
  
  strcpy(deqcmd.data,*++argv);
  printf("jid %s\n",deqcmd.data);

  if ((fd = open("/tmp/server",O_WRONLY)) < 0)
    error_sys("deq open fifo failed");

  if (write(fd,&deqcmd,DATALEN)< 0)
     error_sys("deq write failed");

  close(fd);
  return 0;
}