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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <unistd.h> 29 #include <sys/stat.h> 30 #include <fcntl.h> 31 32 #include "wbio.h" 33 34 /* 35 * Write `buflen' bytes from `buffer' to the file represented by `fd'. 36 * Returns -1 if all `buflen' bytes cannot be written, otherwise returns 0. 37 */ 38 int 39 wbio_nwrite(int fd, const void *buffer, size_t buflen) 40 { 41 size_t nwritten; 42 ssize_t nbytes; 43 const char *buf = buffer; 44 45 for (nwritten = 0; nwritten < buflen; nwritten += nbytes) { 46 nbytes = write(fd, &buf[nwritten], buflen - nwritten); 47 if (nbytes <= 0) 48 return (-1); 49 } 50 51 return (0); 52 } 53 54 /* 55 * Read `buflen' bytes into `buffer' from the file represented by `fd'. 56 * Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0. 57 */ 58 int 59 wbio_nread(int fd, void *buffer, size_t buflen) 60 { 61 size_t nread; 62 ssize_t nbytes; 63 char *buf = buffer; 64 65 for (nread = 0; nread < buflen; nread += nbytes) { 66 nbytes = read(fd, &buf[nread], buflen - nread); 67 if (nbytes <= 0) 68 return (-1); 69 } 70 71 return (0); 72 } 73 74 /* 75 * Read a random number of `buflen' bytes into `buffer' from /dev/urandom. 76 * Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0. 77 */ 78 int 79 wbio_nread_rand(void *buffer, size_t buflen) 80 { 81 int fd; 82 83 if ((fd = open("/dev/urandom", O_RDONLY)) == -1) { 84 return (-1); 85 } 86 87 if (wbio_nread(fd, buffer, buflen) != 0) { 88 (void) close(fd); 89 return (-1); 90 } 91 92 (void) close(fd); 93 return (0); 94 } 95