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> 16 SM_RCSID("@(#)$Id: fwrite.c,v 1.22 2001/04/03 01:46:40 ca 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 38 size_t 39 sm_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