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Annotation of src/usr.bin/sendbug/atomicio.c, Revision 1.4

1.4     ! deraadt     1: /* $OpenBSD: atomicio.c,v 1.3 2007/09/07 14:50:44 tobias Exp $ */
1.1       ray         2: /*
                      3:  * Copyright (c) 2006 Damien Miller. All rights reserved.
                      4:  * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
                      5:  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     19:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     20:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     21:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     22:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     23:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     24:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     25:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     26:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     27:  */
                     28:
                     29: #include <errno.h>
1.3       tobias     30: #include <poll.h>
                     31: #include <unistd.h>
1.1       ray        32:
                     33: #include "atomicio.h"
                     34:
                     35: /*
                     36:  * ensure all of data on socket comes through. f==read || f==vwrite
                     37:  */
                     38: size_t
                     39: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
                     40: {
                     41:        char *s = _s;
                     42:        size_t pos = 0;
                     43:        ssize_t res;
1.3       tobias     44:        struct pollfd pfd;
1.1       ray        45:
1.3       tobias     46:        pfd.fd = fd;
                     47:        pfd.events = f == read ? POLLIN : POLLOUT;
1.1       ray        48:        while (n > pos) {
                     49:                res = (f) (fd, s + pos, n - pos);
                     50:                switch (res) {
                     51:                case -1:
1.3       tobias     52:                        if (errno == EINTR)
1.1       ray        53:                                continue;
1.3       tobias     54:                        if (errno == EAGAIN) {
                     55:                                (void)poll(&pfd, 1, -1);
                     56:                                continue;
                     57:                        }
1.1       ray        58:                        return 0;
                     59:                case 0:
                     60:                        errno = EPIPE;
                     61:                        return pos;
                     62:                default:
                     63:                        pos += (size_t)res;
                     64:                }
                     65:        }
                     66:        return (pos);
                     67: }