1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1991, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)logname.c 8.1 (Berkeley) 06/09/93"; 16 #endif /* not lint */ 17 18 #include <errno.h> 19 #include <unistd.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 24 main(argc, argv) 25 int argc; 26 char *argv[]; 27 { 28 int ch; 29 char *p; 30 31 while ((ch = getopt(argc, argv, "")) != EOF) 32 switch(ch) { 33 case '?': 34 default: 35 usage(); 36 } 37 argc -= optind; 38 argv += optind; 39 40 if ((p = getlogin()) == NULL) { 41 (void)fprintf(stderr, "logname: %s\n", strerror(errno)); 42 exit(1); 43 } 44 (void)printf("%s\n", p); 45 exit(0); 46 } 47 48 usage() 49 { 50 (void)fprintf(stderr, "usage: logname\n"); 51 exit(1); 52 } 53