jobin.c

作业调度程序

#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
 *     enq [-p num] e_file args
 */
void usage()
{
  printf("Usage:  jobin [-p num] e_file args\n"
	 "\t-p num\t\t specify the job priority\n"
	 "\te_file\t\t the absolute path of the exefile\n"
	 "\targs\t\t the args passed to the e_file\n");
}

int main(int argc,char *argv[])
{
  int p = 0;
  int fd;
  char c,*offset;
  struct jobcmd enqcmd;

  if (argc == 1) {
    usage();
    return 1;
  }

  while (--argc > 0 && (*++argv)[0] == '-') {
    while ((c = *++argv[0]))
      switch (c) {
      case 'p':
	p = atoi(*(++argv));
	argc--;
	break;
      default:
	printf("Illegal option %c\n",c);
	return 1;
      }
  }

  if (p < 0 || p > 3) {
    printf("invalid priority: must between 0 and 3\n");
    return 1;
  }
  
  enqcmd.type = ENQ;
  enqcmd.defpri = p;
  enqcmd.owner = getuid();
  enqcmd.argnum = argc;
  offset = enqcmd.data;

  while (argc-- > 0) {
    strcpy(offset,*argv);
    strcat(offset,":");
    offset = offset + strlen(*argv) + 1;
    argv++;
  }

#ifdef DEBUG
  printf("enqcmd cmdtype\t%d\n"
	 "enqcmd owner\t%d\n"
	 "enqcmd defpri\t%d\n"
	 "enqcmd data\t%s\n",
	 enqcmd.type, enqcmd.owner, enqcmd.defpri, enqcmd.data);
#endif

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

  if (write(fd,&enqcmd,DATALEN)< 0)
     error_sys("jobin write failed");

  close(fd);
  return 0;
}