1 /** @file 2 * 3 * Copyright (c) 1999 - 2014, Intel Corporation. All rights reserved.<BR> 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * 3. All advertising materials mentioning features or use of this software must 16 * display the following acknowledgement: 17 * 18 * This product includes software developed by Intel Corporation and its 19 * contributors. 20 * 21 * 4. Neither the name of Intel Corporation or its contributors may be used to 22 * endorse or promote products derived from this software without specific 23 * prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 27 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR 29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 32 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 * 36 */ 37 38 /*++ 39 40 Module Name: 41 42 writev.c 43 44 Abstract: 45 46 Functions implementing the standard "writev" system call interface 47 48 49 Revision History 50 51 --*/ 52 #include <LibConfig.h> 53 54 #ifdef foo 55 #include <efi_interface.h> 56 #include <unistd.h> 57 #include <fcntl.h> 58 #define KERNEL 59 #include <errno.h> 60 #undef KERNEL 61 #include "./filedesc.h" 62 63 #include <libc_debug.h> 64 #include <assert.h> 65 #endif 66 67 #include <stdlib.h> 68 #include <unistd.h> 69 #include <sys/uio.h> 70 #include <string.h> 71 #ifndef KERNEL 72 #define KERNEL 73 #include <errno.h> 74 #undef KERNEL 75 #else 76 #include <errno.h> 77 #endif 78 79 // 80 // Name: 81 // writev 82 // 83 // Description: 84 // BSD writev interface for libc 85 // 86 // Arguments: 87 // File Descriptor (index into file descriptor table) 88 // iovec pointer 89 // size of iovec array 90 // 91 // Returns: 92 // number of bytes written 93 // 94 95 ssize_t 96 writev( 97 int fd, 98 const struct iovec *iov, 99 int iovcnt 100 ) 101 { 102 const struct iovec *pVecTmp; 103 char *pBuf; 104 size_t TotalBytes; 105 size_t i; 106 size_t ret; 107 108 // 109 // See how much memory we'll need 110 // 111 112 for (i = 0, TotalBytes = 0, pVecTmp = iov; i < (size_t)iovcnt; i++, pVecTmp++) { 113 TotalBytes += pVecTmp->iov_len; 114 } 115 116 // 117 // Allocate a contiguous buffer 118 // 119 120 pBuf = (char*)malloc (TotalBytes); 121 if (pBuf == NULL) { 122 errno = ENOMEM; 123 return -1; 124 } 125 126 // 127 // Copy vectors to the buffer 128 // 129 130 for (; iovcnt; iovcnt--) { 131 bcopy(iov->iov_base, pBuf, iov->iov_len); 132 pBuf += iov->iov_len; 133 iov++; 134 } 135 136 // 137 // Use standard write(2) then free buffer 138 // 139 140 ret = write (fd, pBuf, TotalBytes); 141 free (pBuf); 142 143 return (ret); 144 } 145
