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Annotation of src/usr.bin/nc/atomicio.c, Revision 1.6

1.1       ericj       1: /*
1.6     ! avsm        2:  * Copyright (c) 2005 Anil Madhavapeddy.  All rights served.
1.1       ericj       3:  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
                      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.
1.6     ! avsm       25:  * $OpenBSD$
1.1       ericj      26:  */
                     27:
                     28: #include <sys/types.h>
                     29: #include <sys/uio.h>
                     30: #include <errno.h>
                     31: #include <unistd.h>
1.6     ! avsm       32: #include "atomicio.h"
1.3       deraadt    33:
1.1       ericj      34: /*
1.6     ! avsm       35:  * ensure all of data on socket comes through. f==read || f==vwrite
1.1       ericj      36:  */
1.6     ! avsm       37: size_t
        !            38: atomicio(f, fd, _s, n)
        !            39:        ssize_t (*f) (int, void *, size_t);
        !            40:        int fd;
        !            41:        void *_s;
        !            42:        size_t n;
1.1       ericj      43: {
                     44:        char *s = _s;
1.6     ! avsm       45:        size_t pos = 0;
        !            46:        ssize_t res;
1.1       ericj      47:
1.6     ! avsm       48:        while (n > pos) {
1.1       ericj      49:                res = (f) (fd, s + pos, n - pos);
                     50:                switch (res) {
                     51:                case -1:
                     52:                        if (errno == EINTR || errno == EAGAIN)
                     53:                                continue;
1.6     ! avsm       54:                        return 0;
1.1       ericj      55:                case 0:
1.6     ! avsm       56:                        errno = EPIPE;
        !            57:                        return pos;
1.1       ericj      58:                default:
1.6     ! avsm       59:                        pos += (u_int)res;
1.1       ericj      60:                }
                     61:        }
1.6     ! avsm       62:        return pos;
1.1       ericj      63: }