1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak _cuserid = cuserid 33 34 #include "lint.h" 35 #include <stdio.h> 36 #include <pwd.h> 37 #include <string.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 #include <pthread.h> 41 42 static char res[L_cuserid]; 43 44 char * 45 cuserid(char *s) 46 { 47 struct passwd *pw; 48 struct passwd pwd; 49 char buffer[BUFSIZ]; 50 char utname[L_cuserid]; 51 char *p; 52 int cancel_state; 53 54 /* 55 * The UNIX98 Posix conformance test suite requires 56 * cuserid() to not be a cancellation point. 57 */ 58 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state); 59 60 if (s == NULL) 61 s = res; 62 if ((p = getlogin_r(utname, L_cuserid)) != NULL) { 63 (void) strlcpy(s, p, L_cuserid); 64 } else if ((pw = getpwuid_r(getuid(), &pwd, buffer, BUFSIZ)) != NULL) { 65 (void) strlcpy(s, pw->pw_name, L_cuserid); 66 } else { 67 *s = '\0'; 68 s = NULL; 69 } 70 71 (void) pthread_setcancelstate(cancel_state, NULL); 72 return (s); 73 } 74