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 weak _cuserid = cuserid 31 32 #include "lint.h" 33 #include <stdio.h> 34 #include <pwd.h> 35 #include <string.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 #include <pthread.h> 39 40 static char res[L_cuserid]; 41 42 char * 43 cuserid(char *s) 44 { 45 struct passwd *pw; 46 struct passwd pwd; 47 char buffer[BUFSIZ]; 48 char utname[L_cuserid]; 49 char *p; 50 int cancel_state; 51 52 /* 53 * The UNIX98 Posix conformance test suite requires 54 * cuserid() to not be a cancellation point. 55 */ 56 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state); 57 58 if (s == NULL) 59 s = res; 60 if ((p = getlogin_r(utname, L_cuserid)) != NULL) { 61 (void) strlcpy(s, p, L_cuserid); 62 } else if ((pw = getpwuid_r(getuid(), &pwd, buffer, BUFSIZ)) != NULL) { 63 (void) strlcpy(s, pw->pw_name, L_cuserid); 64 } else { 65 *s = '\0'; 66 s = NULL; 67 } 68 69 (void) pthread_setcancelstate(cancel_state, NULL); 70 return (s); 71 } 72