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Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.13

1.1       deraadt     1: /*
1.13    ! avsm        2:  * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
1.9       deraadt     3:  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
1.1       deraadt     4:  * All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      9:  * 1. Redistributions of source code must retain the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer.
                     11:  * 2. Redistributions in binary form must reproduce the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer in the
                     13:  *    documentation and/or other materials provided with the distribution.
                     14:  *
                     15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     17:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     18:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     19:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     20:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     24:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26:
                     27: #include "includes.h"
1.13    ! avsm       28: RCSID("$OpenBSD: atomicio.c,v 1.12 2003/07/31 15:50:16 avsm Exp $");
1.1       deraadt    29:
1.8       markus     30: #include "atomicio.h"
1.1       deraadt    31:
                     32: /*
1.12      avsm       33:  * ensure all of data on socket comes through. f==read || f==vwrite
1.1       deraadt    34:  */
1.13    ! avsm       35: size_t
1.3       markus     36: atomicio(f, fd, _s, n)
1.11      deraadt    37:        ssize_t (*f) (int, void *, size_t);
1.1       deraadt    38:        int fd;
1.3       markus     39:        void *_s;
1.1       deraadt    40:        size_t n;
                     41: {
1.3       markus     42:        char *s = _s;
1.13    ! avsm       43:        size_t pos = 0;
        !            44:        ssize_t res;
1.1       deraadt    45:
                     46:        while (n > pos) {
                     47:                res = (f) (fd, s + pos, n - pos);
                     48:                switch (res) {
                     49:                case -1:
                     50:                        if (errno == EINTR || errno == EAGAIN)
                     51:                                continue;
1.13    ! avsm       52:                        return 0;
1.1       deraadt    53:                case 0:
1.13    ! avsm       54:                        errno = EPIPE;
        !            55:                        return pos;
1.1       deraadt    56:                default:
1.13    ! avsm       57:                        pos += (u_int)res;
1.1       deraadt    58:                }
                     59:        }
                     60:        return (pos);
                     61: }