OpenCoverage

atomicio.c

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1/* $OpenBSD: atomicio.c,v 1.28 2016/07/27 23:18:12 djm Exp $ */-
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 "includes.h"-
30-
31#include <sys/param.h>-
32#include <sys/uio.h>-
33-
34#include <errno.h>-
35#ifdef HAVE_POLL_H-
36#include <poll.h>-
37#else-
38# ifdef HAVE_SYS_POLL_H-
39# include <sys/poll.h>-
40# endif-
41#endif-
42#include <string.h>-
43#include <unistd.h>-
44#include <limits.h>-
45-
46#include "atomicio.h"-
47-
48/*-
49 * ensure all of data on socket comes through. f==read || f==vwrite-
50 */-
51size_t-
52atomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n,-
53 int (*cb)(void *, size_t), void *cb_arg)-
54{-
55 char *s = _s;-
56 size_t pos = 0;-
57 ssize_t res;-
58 struct pollfd pfd;-
59-
60#ifndef BROKEN_READ_COMPARISON-
61 pfd.fd = fd;-
62 pfd.events = f == read ? POLLIN : POLLOUT;
f == readDescription
TRUEevaluated 138 times by 3 tests
Evaluated by:
  • ssh-keygen
  • sshd
  • test_sshkey
FALSEevaluated 7 times by 1 test
Evaluated by:
  • ssh-keygen
7-138
63#endif-
64 while (n > pos) {
n > posDescription
TRUEevaluated 212 times by 3 tests
Evaluated by:
  • ssh-keygen
  • sshd
  • test_sshkey
FALSEevaluated 11 times by 3 tests
Evaluated by:
  • ssh-keygen
  • sshd
  • test_sshkey
11-212
65 res = (f) (fd, s + pos, n - pos);-
66 switch (res) {-
67 case -1:
never executed: case -1:
0
68 if (errno == EINTR)
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEnever evaluated
0
69 continue;
never executed: continue;
0
70 if (errno == EAGAIN || errno == EWOULDBLOCK) {
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
0
71#ifndef BROKEN_READ_COMPARISON-
72 (void)poll(&pfd, 1, -1);-
73#endif-
74 continue;
never executed: continue;
0
75 }-
76 return 0;
never executed: return 0;
0
77 case 0:
executed 134 times by 3 tests: case 0:
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
134
78 errno = EPIPE;-
79 return pos;
executed 134 times by 3 tests: return pos;
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
134
80 default:
executed 78 times by 3 tests: default:
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
78
81 pos += (size_t)res;-
82 if (cb != NULL && cb(cb_arg, (size_t)res) == -1) {
cb != ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 78 times by 3 tests
Evaluated by:
  • ssh-keygen
  • sshd
  • test_sshkey
cb(cb_arg, (size_t)res) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0-78
83 errno = EINTR;-
84 return pos;
never executed: return pos;
0
85 }-
86 }
executed 78 times by 3 tests: end of block
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
78
87 }-
88 return pos;
executed 11 times by 3 tests: return pos;
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
11
89}-
90-
91size_t-
92atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)-
93{-
94 return atomicio6(f, fd, _s, n, NULL, NULL);
executed 145 times by 3 tests: return atomicio6(f, fd, _s, n, ((void *)0) , ((void *)0) );
Executed by:
  • ssh-keygen
  • sshd
  • test_sshkey
145
95}-
96-
97/*-
98 * ensure all of data on socket comes through. f==readv || f==writev-
99 */-
100size_t-
101atomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd,-
102 const struct iovec *_iov, int iovcnt,-
103 int (*cb)(void *, size_t), void *cb_arg)-
104{-
105 size_t pos = 0, rem;-
106 ssize_t res;-
107 struct iovec iov_array[IOV_MAX], *iov = iov_array;-
108 struct pollfd pfd;-
109-
110 if (iovcnt < 0 || iovcnt > IOV_MAX) {
iovcnt < 0Description
TRUEnever evaluated
FALSEnever evaluated
iovcnt > 1024Description
TRUEnever evaluated
FALSEnever evaluated
0
111 errno = EINVAL;-
112 return 0;
never executed: return 0;
0
113 }-
114 /* Make a copy of the iov array because we may modify it below */-
115 memcpy(iov, _iov, (size_t)iovcnt * sizeof(*_iov));-
116-
117#ifndef BROKEN_READV_COMPARISON-
118 pfd.fd = fd;-
119 pfd.events = f == readv ? POLLIN : POLLOUT;
f == readvDescription
TRUEnever evaluated
FALSEnever evaluated
0
120#endif-
121 for (; iovcnt > 0 && iov[0].iov_len > 0;) {
iovcnt > 0Description
TRUEnever evaluated
FALSEnever evaluated
iov[0].iov_len > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
122 res = (f) (fd, iov, iovcnt);-
123 switch (res) {-
124 case -1:
never executed: case -1:
0
125 if (errno == EINTR)
(*__errno_location ()) == 4Description
TRUEnever evaluated
FALSEnever evaluated
0
126 continue;
never executed: continue;
0
127 if (errno == EAGAIN || errno == EWOULDBLOCK) {
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
(*__errno_location ()) == 11Description
TRUEnever evaluated
FALSEnever evaluated
0
128#ifndef BROKEN_READV_COMPARISON-
129 (void)poll(&pfd, 1, -1);-
130#endif-
131 continue;
never executed: continue;
0
132 }-
133 return 0;
never executed: return 0;
0
134 case 0:
never executed: case 0:
0
135 errno = EPIPE;-
136 return pos;
never executed: return pos;
0
137 default:
never executed: default:
0
138 rem = (size_t)res;-
139 pos += rem;-
140 /* skip completed iov entries */-
141 while (iovcnt > 0 && rem >= iov[0].iov_len) {
iovcnt > 0Description
TRUEnever evaluated
FALSEnever evaluated
rem >= iov[0].iov_lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
142 rem -= iov[0].iov_len;-
143 iov++;-
144 iovcnt--;-
145 }
never executed: end of block
0
146 /* This shouldn't happen... */-
147 if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
rem > 0Description
TRUEnever evaluated
FALSEnever evaluated
iovcnt <= 0Description
TRUEnever evaluated
FALSEnever evaluated
rem > iov[0].iov_lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
148 errno = EFAULT;-
149 return 0;
never executed: return 0;
0
150 }-
151 if (iovcnt == 0)
iovcnt == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
152 break;
never executed: break;
0
153 /* update pointer in partially complete iov */-
154 iov[0].iov_base = ((char *)iov[0].iov_base) + rem;-
155 iov[0].iov_len -= rem;-
156 }
never executed: end of block
0
157 if (cb != NULL && cb(cb_arg, (size_t)res) == -1) {
cb != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
cb(cb_arg, (size_t)res) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
158 errno = EINTR;-
159 return pos;
never executed: return pos;
0
160 }-
161 }
never executed: end of block
0
162 return pos;
never executed: return pos;
0
163}-
164-
165size_t-
166atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,-
167 const struct iovec *_iov, int iovcnt)-
168{-
169 return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL);
never executed: return atomiciov6(f, fd, _iov, iovcnt, ((void *)0) , ((void *)0) );
0
170}-
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