fwrite.c revision 90792
1/* 2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * By using this file, you agree to the terms and conditions set 11 * forth in the LICENSE file which can be found at the top level of 12 * the sendmail distribution. 13 */ 14 15#include <sm/gen.h> 16SM_RCSID("@(#)$Id: fwrite.c,v 1.24 2001/09/11 04:04:48 gshapiro Exp $") 17#include <errno.h> 18#include <sm/io.h> 19#include <sm/assert.h> 20#include "local.h" 21#include "fvwrite.h" 22 23/* 24** SM_IO_WRITE -- write to a file pointer 25** 26** Parameters: 27** fp -- file pointer writing to 28** timeout -- time to complete the write 29** buf -- location of data to be written 30** size -- number of bytes to be written 31** 32** Result: 33** Failure: returns 0 _and_ sets errno 34** Success: returns >=0 with errno unchanged, where the 35** number returned is the number of bytes written. 36*/ 37 38size_t 39sm_io_write(fp, timeout, buf, size) 40 SM_FILE_T *fp; 41 int timeout; 42 const void *buf; 43 size_t size; 44{ 45 struct sm_uio uio; 46 struct sm_iov iov; 47 48 SM_REQUIRE_ISA(fp, SmFileMagic); 49 50 if (fp->f_write == NULL) 51 { 52 errno = ENODEV; 53 return 0; 54 } 55 56 iov.iov_base = (void *) buf; 57 uio.uio_resid = iov.iov_len = size; 58 uio.uio_iov = &iov; 59 uio.uio_iovcnt = 1; 60 61 /* The usual case is success (sm_fvwrite returns 0) */ 62 if (sm_fvwrite(fp, timeout, &uio) == 0) 63 return size; 64 65 /* else return number of bytes actually written */ 66 return size - uio.uio_resid; 67} 68