clean up leftover lock files

[unix-history] / usr / src / usr.bin / mt / mt.c

static  char *sccsid = "@(#)mt.c        4.2 (Berkeley) 81/07/05";

/*
* mt
*/

#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/mtio.h>
#include <sys/ioctl.h>

struct commands {
       char *c_name;
       int c_code;
       int c_ronly;
} com[] = {
       "eof",  MTWEOF, 0,
       "fsf",  MTFSF,  1,
       "bsf",  MTBSF,  1,
       "fsr",  MTFSR,  1,
       "bsr",  MTBSR,  1,
       "rewind",       MTREW,  1,
       "offline",      MTOFFL, 1,
       0,0
};

int mtfd;
struct mtop mt_com;
char *tape;

main(argc, argv)
char **argv;
{
       char line[80], *getenv();
       register char *cp;
       register struct commands *comp;

       if (argc < 2) {
               fprintf(stderr, "usage: mt [ -t tape ] command [ count ]\n");
               exit(1);
       }
       if ((strcmp(argv[1], "-t") == 0) && argc > 2) {
               argc -= 2;
               tape = argv[2];
               argv += 2;
       } else
               if ((tape = getenv("TAPE")) == NULL)
                       tape = "/dev/rmt12";
       cp = argv[1];
       for (comp = com; comp->c_name != NULL; comp++)
               if (strncmp(cp, comp->c_name, strlen(cp)) == 0)
                       break;
       if (comp->c_name == NULL) {
               fprintf(stderr, "mt: don't grok \"%s\"\n", cp);
               exit(1);
       }
       if ((mtfd = open(tape, comp->c_ronly ? 0 : 2)) < 0) {
               perror(tape);
               exit(1);
       }
       mt_com.mt_count = (argc > 2 ? atoi(argv[2]) : 1);
       mt_com.mt_op = comp->c_code;
       if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0) {
               fprintf(stderr, "%s %d ", comp->c_name, mt_com.mt_count);
               perror("failed");
       }
}