Annotation of src/usr.bin/nc/atomicio.c, Revision 1.10
1.10 ! jeremy 1: /* $OpenBSD: atomicio.c,v 1.9 2007/09/07 14:50:44 tobias Exp $ */
1.1 ericj 2: /*
1.9 tobias 3: * Copyright (c) 2006 Damien Miller. All rights reserved.
4: * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
1.1 ericj 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:
1.9 tobias 29: #include <sys/param.h>
30:
1.1 ericj 31: #include <errno.h>
1.9 tobias 32: #include <poll.h>
1.1 ericj 33: #include <unistd.h>
1.9 tobias 34:
1.6 avsm 35: #include "atomicio.h"
1.3 deraadt 36:
1.1 ericj 37: /*
1.6 avsm 38: * ensure all of data on socket comes through. f==read || f==vwrite
1.1 ericj 39: */
1.6 avsm 40: size_t
1.9 tobias 41: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1 ericj 42: {
43: char *s = _s;
1.6 avsm 44: size_t pos = 0;
45: ssize_t res;
1.9 tobias 46: struct pollfd pfd;
1.1 ericj 47:
1.9 tobias 48: pfd.fd = fd;
49: pfd.events = f == read ? POLLIN : POLLOUT;
1.6 avsm 50: while (n > pos) {
1.1 ericj 51: res = (f) (fd, s + pos, n - pos);
52: switch (res) {
53: case -1:
1.9 tobias 54: if (errno == EINTR)
55: continue;
1.10 ! jeremy 56: if ((errno == EAGAIN) || (errno == ENOBUFS)) {
1.9 tobias 57: (void)poll(&pfd, 1, -1);
1.1 ericj 58: continue;
1.9 tobias 59: }
1.6 avsm 60: return 0;
1.1 ericj 61: case 0:
1.6 avsm 62: errno = EPIPE;
63: return pos;
1.1 ericj 64: default:
1.8 otto 65: pos += (size_t)res;
1.1 ericj 66: }
67: }
1.9 tobias 68: return (pos);
1.1 ericj 69: }