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Annotation of src/usr.bin/nc/atomicio.c, Revision 1.2

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