48 lines
810 B
C
48 lines
810 B
C
#ifndef lint
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static char sccsid[] = "@(#)biff.c 1.1 92/07/30 SMI"; /* from UCB 4.2 07/02/83 */
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#endif
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/*
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* biff
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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char *ttyname();
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *cp = ttyname(2);
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struct stat stb;
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argc--, argv++;
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if (cp == 0)
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fprintf(stderr, "Where are you?\n"), exit(1);
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if (stat(cp, &stb) < 0)
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perror(cp), exit(1);
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if (argc == 0) {
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printf("is %s\n", stb.st_mode&0100 ? "y" : "n");
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exit((stb.st_mode&0100) ? 0 : 1);
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}
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switch (argv[0][0]) {
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case 'y':
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if (chmod(cp, stb.st_mode|0100) < 0)
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perror(cp);
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break;
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case 'n':
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if (chmod(cp, stb.st_mode&~0100) < 0)
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perror(cp);
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break;
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default:
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fprintf(stderr, "usage: biff [y] [n]\n");
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}
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exit((stb.st_mode&0100) ? 0 : 1);
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/* NOTREACHED */
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}
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