lib: Allow reception of mtstdopen info structure.
[ashd.git] / lib / mtio.c
CommitLineData
83723896
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1/*
2 ashd - A Sane HTTP Daemon
3 Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17*/
18
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19#ifdef HAVE_CONFIG_H
20#include <config.h>
21#endif
83723896 22#include <stdlib.h>
e1cdf02e 23#include <stdio.h>
0b7964e9 24#include <unistd.h>
e1cdf02e 25#include <fcntl.h>
83723896 26#include <string.h>
83723896 27#include <errno.h>
e1cdf02e 28#include <sys/socket.h>
83723896 29
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30#include <log.h>
31#include <utils.h>
32#include <mt.h>
33#include <mtio.h>
34
2b8eb6df 35static ssize_t mtread(void *cookie, void *buf, size_t len)
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36{
37 struct stdiofd *d = cookie;
38 int ev;
39 ssize_t ret;
40
41 while(1) {
42 ret = read(d->fd, buf, len);
43 if((ret < 0) && (errno == EAGAIN)) {
44 ev = block(d->fd, EV_READ, d->timeout);
45 if(ev < 0) {
46 /* If we just go on, we should get the real error. */
47 continue;
48 } else if(ev == 0) {
49 errno = ETIMEDOUT;
50 return(-1);
51 } else {
52 continue;
53 }
54 } else {
55 return(ret);
56 }
57 }
58}
59
2b8eb6df 60static ssize_t mtwrite(void *cookie, const void *buf, size_t len)
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61{
62 struct stdiofd *d = cookie;
63 int ev;
64 ssize_t ret;
65
c3424008 66 while(1) {
e1cdf02e 67 if(d->sock)
c3424008 68 ret = send(d->fd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL);
e1cdf02e 69 else
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70 ret = write(d->fd, buf, len);
71 if((ret < 0) && (errno == EAGAIN)) {
72 ev = block(d->fd, EV_WRITE, d->timeout);
73 if(ev < 0) {
74 /* If we just go on, we should get the real error. */
75 continue;
76 } else if(ev == 0) {
77 errno = ETIMEDOUT;
78 return(-1);
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79 }
80 } else {
c3424008 81 return(ret);
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82 }
83 }
84}
85
86static int mtclose(void *cookie)
87{
88 struct stdiofd *d = cookie;
89
90 close(d->fd);
91 free(d);
92 return(0);
93}
94
b71ad67f 95FILE *mtstdopen(int fd, int issock, int timeout, char *mode, struct stdiofd **infop)
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96{
97 struct stdiofd *d;
98 FILE *ret;
99 int r, w;
100
101 if(!strcmp(mode, "r")) {
102 r = 1; w = 0;
103 } else if(!strcmp(mode, "w")) {
104 r = 0; w = 1;
105 } else if(!strcmp(mode, "r+")) {
106 r = w = 1;
107 } else {
108 return(NULL);
109 }
110 omalloc(d);
111 d->fd = fd;
112 d->sock = issock;
113 d->timeout = timeout;
b71ad67f 114 if(!(ret = funstdio(d, r?mtread:NULL, w?mtwrite:NULL, NULL, mtclose))) {
2a619a21 115 free(d);
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116 return(NULL);
117 }
118 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
119 if(infop)
120 *infop = d;
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121 return(ret);
122}
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123
124struct pipe {
125 struct charbuf data;
126 size_t bufmax;
127 int closed;
128 struct muth *r, *w;
129};
130
131static void freepipe(struct pipe *p)
132{
133 buffree(p->data);
134 free(p);
135}
136
137static ssize_t piperead(void *pdata, void *buf, size_t len)
138{
139 struct pipe *p = pdata;
140 ssize_t ret;
141
142 while(p->data.d == 0) {
143 if(p->closed & 2)
144 return(0);
145 if(p->r) {
146 errno = EBUSY;
147 return(-1);
148 }
149 p->r = current;
150 yield();
151 p->r = NULL;
152 }
153 ret = min(len, p->data.d);
154 memcpy(buf, p->data.b, ret);
155 memmove(p->data.b, p->data.b + ret, p->data.d -= ret);
156 if(p->w)
157 resume(p->w, 0);
158 return(ret);
159}
160
161static int piperclose(void *pdata)
162{
163 struct pipe *p = pdata;
164
165 if(p->closed & 2) {
166 freepipe(p);
167 } else {
168 p->closed |= 1;
169 if(p->w)
170 resume(p->w, 0);
171 }
172 return(0);
173}
174
175static ssize_t pipewrite(void *pdata, const void *buf, size_t len)
176{
177 struct pipe *p = pdata;
c3424008 178 ssize_t ret;
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179
180 if(p->closed & 1) {
181 errno = EPIPE;
182 return(-1);
183 }
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184 while(p->data.d >= p->bufmax) {
185 if(p->w) {
186 errno = EBUSY;
187 return(-1);
188 }
189 p->w = current;
190 yield();
191 p->w = NULL;
192 if(p->closed & 1) {
193 errno = EPIPE;
194 return(-1);
d8aea4cf 195 }
d8aea4cf 196 }
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197 ret = min(len, p->bufmax - p->data.d);
198 sizebuf(p->data, p->data.d + ret);
199 memcpy(p->data.b + p->data.d, buf, ret);
200 p->data.d += ret;
201 if(p->r)
202 resume(p->r, 0);
203 return(ret);
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204}
205
206static int pipewclose(void *pdata)
207{
208 struct pipe *p = pdata;
209
210 if(p->closed & 1) {
211 freepipe(p);
212 } else {
213 p->closed |= 2;
214 if(p->r)
215 resume(p->r, 0);
216 }
217 return(0);
218}
219
220void mtiopipe(FILE **read, FILE **write)
221{
222 struct pipe *p;
223
224 omalloc(p);
225 p->bufmax = 4096;
226 *read = funstdio(p, piperead, NULL, NULL, piperclose);
227 *write = funstdio(p, NULL, pipewrite, NULL, pipewclose);
228}