[ashd.git] / lib / mtio.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/socket.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <log.h>
#include <utils.h>
#include <mt.h>
#include <mtio.h>

static struct blocker *blockers;

#ifdef HAVE_EPOLL

/* 
 * Support for epoll. Optimally, different I/O loops should be split
 * into different files for greater clarity, but I'll save that fun
 * for another day. 
 *
 * Scroll down to #else for the normal select loop.
 */

#include <sys/epoll.h>

struct blocker {
    struct blocker *n, *p, *n2, *p2;
    int fd, reg;
    int ev;
    time_t to;
    struct muth *th;
};

static int epfd = -1, fdln = 0;
static struct blocker **fdlist;

static int regfd(struct blocker *bl)
{
    struct blocker *o;
    struct epoll_event evd;

    evd.events = 0;
    if(bl->ev & EV_READ)
	evd.events |= EPOLLIN;
    if(bl->ev & EV_WRITE)
	evd.events |= EPOLLOUT;
    evd.data.fd = bl->fd;
    if(bl->fd >= fdln) {
	if(fdlist) {
	    fdlist = srealloc(fdlist, sizeof(*fdlist) * (bl->fd + 1));
	    memset(fdlist + fdln, 0, sizeof(*fdlist) * (bl->fd + 1 - fdln));
	    fdln = bl->fd + 1;
	} else {
	    fdlist = szmalloc(sizeof(*fdlist) * (fdln = (bl->fd + 1)));
	}
    }
    if(fdlist[bl->fd] == NULL) {
	if(epoll_ctl(epfd, EPOLL_CTL_ADD, bl->fd, &evd)) {
	    /* XXX?! Whatever to do, really? */
	    flog(LOG_ERR, "epoll_add on fd %i: %s", bl->fd, strerror(errno));
	    return(-1);
	}
    } else {
	for(o = fdlist[bl->fd]; o; o = o->n2) {
	    if(o->ev & EV_READ)
		evd.events |= EPOLLIN;
	    if(o->ev & EV_WRITE)
		evd.events |= EPOLLOUT;
	}
	if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
	    /* XXX?! Whatever to do, really? */
	    flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
	    return(-1);
	}
    }
    bl->n2 = fdlist[bl->fd];
    bl->p2 = NULL;
    if(fdlist[bl->fd] != NULL)
	fdlist[bl->fd]->p2 = bl;
    fdlist[bl->fd] = bl;
    bl->reg = 1;
    return(0);
}

static void remfd(struct blocker *bl)
{
    struct blocker *o;
    struct epoll_event evd;
    
    if(!bl->reg)
	return;
    if(bl->n2)
	bl->n2->p2 = bl->p2;
    if(bl->p2)
	bl->p2->n2 = bl->n2;
    if(bl == fdlist[bl->fd])
	fdlist[bl->fd] = bl->n2;
    if(fdlist[bl->fd] == NULL) {
	if(epoll_ctl(epfd, EPOLL_CTL_DEL, bl->fd, NULL))
	    flog(LOG_ERR, "epoll_del on fd %i: %s", bl->fd, strerror(errno));
    } else {
	evd.events = 0;
	evd.data.fd = bl->fd;
	for(o = fdlist[bl->fd]; o; o = o->n2) {
	    if(o->ev & EV_READ)
		evd.events |= EPOLLIN;
	    if(o->ev & EV_WRITE)
		evd.events |= EPOLLOUT;
	}
	if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
	    /* XXX?! Whatever to do, really? */
	    flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
	}
    }
}

int block(int fd, int ev, time_t to)
{
    struct blocker *bl;
    int rv;
    
    omalloc(bl);
    bl->fd = fd;
    bl->ev = ev;
    if(to > 0)
	bl->to = time(NULL) + to;
    bl->th = current;
    if((epfd >= 0) && regfd(bl)) {
	free(bl);
	return(-1);
    }
    bl->n = blockers;
    if(blockers)
	blockers->p = bl;
    blockers = bl;
    rv = yield();
    if(bl->n)
	bl->n->p = bl->p;
    if(bl->p)
	bl->p->n = bl->n;
    if(bl == blockers)
	blockers = bl->n;
    remfd(bl);
    free(bl);
    return(rv);
}

void ioloop(void)
{
    struct blocker *bl, *nbl;
    struct epoll_event evr[16];
    int i, fd, nev, ev;
    time_t now, timeout;
    
    epfd = epoll_create(128);
    for(bl = blockers; bl; bl = nbl) {
	nbl = bl->n;
	if(regfd(bl))
	    resume(bl->th, -1);
    }
    while(blockers != NULL) {
	timeout = 0;
	for(bl = blockers; bl; bl = bl->n) {
	    if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
		timeout = bl->to;
	}
	now = time(NULL);
	nev = epoll_wait(epfd, evr, sizeof(evr) / sizeof(*evr), timeout?((timeout - now) * 1000):-1);
	if(nev < 0) {
	    if(errno != EINTR) {
		flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno));
		/* To avoid CPU hogging in case it's bad, which it
		 * probably is. */
		sleep(1);
	    }
	    continue;
	}
	now = time(NULL);
	for(i = 0; i < nev; i++) {
	    fd = evr[i].data.fd;
	    ev = 0;
	    if(evr[i].events & EPOLLIN)
		ev |= EV_READ;
	    if(evr[i].events & EPOLLOUT)
		ev |= EV_WRITE;
	    if(evr[i].events & ~(EPOLLIN | EPOLLOUT))
		ev = -1;
	    for(bl = fdlist[fd]; bl; bl = nbl) {
		nbl = bl->n2;
		if((ev < 0) || (ev & bl->ev))
		    resume(bl->th, ev);
		else if((bl->to != 0) && (bl->to <= now))
		    resume(bl->th, 0);
	    }
	}
    }
    close(epfd);
    epfd = -1;
}

#else

struct blocker {
    struct blocker *n, *p;
    int fd;
    int ev;
    time_t to;
    struct muth *th;
};

int block(int fd, int ev, time_t to)
{
    struct blocker *bl;
    int rv;
    
    omalloc(bl);
    bl->fd = fd;
    bl->ev = ev;
    if(to > 0)
	bl->to = time(NULL) + to;
    bl->th = current;
    bl->n = blockers;
    if(blockers)
	blockers->p = bl;
    blockers = bl;
    rv = yield();
    if(bl->n)
	bl->n->p = bl->p;
    if(bl->p)
	bl->p->n = bl->n;
    if(bl == blockers)
	blockers = bl->n;
    free(bl);
    return(rv);
}

void ioloop(void)
{
    int ret;
    fd_set rfds, wfds, efds;
    struct blocker *bl, *nbl;
    struct timeval toval;
    time_t now, timeout;
    int maxfd;
    int ev;
    
    while(blockers != NULL) {
	FD_ZERO(&rfds);
	FD_ZERO(&wfds);
	FD_ZERO(&efds);
	maxfd = 0;
	now = time(NULL);
	timeout = 0;
	for(bl = blockers; bl; bl = bl->n) {
	    if(bl->ev & EV_READ)
		FD_SET(bl->fd, &rfds);
	    if(bl->ev & EV_WRITE)
		FD_SET(bl->fd, &wfds);
	    FD_SET(bl->fd, &efds);
	    if(bl->fd > maxfd)
		maxfd = bl->fd;
	    if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
		timeout = bl->to;
	}
	toval.tv_sec = timeout - now;
	toval.tv_usec = 0;
	ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL);
	if(ret < 0) {
	    if(errno != EINTR) {
		flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno));
		/* To avoid CPU hogging in case it's bad, which it
		 * probably is. */
		sleep(1);
	    }
	}
	now = time(NULL);
	for(bl = blockers; bl; bl = nbl) {
	    nbl = bl->n;
	    ev = 0;
	    if(FD_ISSET(bl->fd, &rfds))
		ev |= EV_READ;
	    if(FD_ISSET(bl->fd, &wfds))
		ev |= EV_WRITE;
	    if(FD_ISSET(bl->fd, &efds))
		ev = -1;
	    if((ev < 0) || (ev & bl->ev))
		resume(bl->th, ev);
	    else if((bl->to != 0) && (bl->to <= now))
		resume(bl->th, 0);
	}
    }
}

#endif

struct stdiofd {
    int fd;
    int sock;
    int timeout;
};

static ssize_t mtread(void *cookie, char *buf, size_t len)
{
    struct stdiofd *d = cookie;
    int ev;
    ssize_t ret;
    
    while(1) {
	ret = read(d->fd, buf, len);
	if((ret < 0) && (errno == EAGAIN)) {
	    ev = block(d->fd, EV_READ, d->timeout);
	    if(ev < 0) {
		/* If we just go on, we should get the real error. */
		continue;
	    } else if(ev == 0) {
		errno = ETIMEDOUT;
		return(-1);
	    } else {
		continue;
	    }
	} else {
	    return(ret);
	}
    }
}

static ssize_t mtwrite(void *cookie, const char *buf, size_t len)
{
    struct stdiofd *d = cookie;
    int ev;
    size_t off;
    ssize_t ret;
    
    off = 0;
    while(off < len) {
	if(d->sock)
	    ret = send(d->fd, buf + off, len - off, MSG_DONTWAIT | MSG_NOSIGNAL);
	else
	    ret = write(d->fd, buf + off, len - off);
	if(ret < 0) {
	    if(errno == EAGAIN) {
		ev = block(d->fd, EV_WRITE, d->timeout);
		if(ev < 0) {
		    /* If we just go on, we should get the real error. */
		    continue;
		} else if(ev == 0) {
		    errno = ETIMEDOUT;
		    return(off);
		} else {
		    continue;
		}
	    } else {
		return(off);
	    }
	} else {
	    off += ret;
	}
    }
    return(off);
}

static int mtclose(void *cookie)
{
    struct stdiofd *d = cookie;
    
    close(d->fd);
    free(d);
    return(0);
}

static cookie_io_functions_t iofuns = {
    .read = mtread,
    .write = mtwrite,
    .close = mtclose,
};

FILE *mtstdopen(int fd, int issock, int timeout, char *mode)
{
    struct stdiofd *d;
    FILE *ret;
    
    omalloc(d);
    d->fd = fd;
    d->sock = issock;
    d->timeout = timeout;
    ret = fopencookie(d, mode, iofuns);
    if(!ret)
	free(d);
    else
	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
    return(ret);
}
Commit	Line	Data
83723896 FT	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
	19	#include <stdlib.h>
e1cdf02e FT	20	#include <stdio.h>
e1cdf02e FT	21	#include <fcntl.h>
83723896 FT	22	#include <unistd.h>
	23	#include <string.h>
	24	#include <time.h>
	25	#include <errno.h>
	26	#include <sys/select.h>
e1cdf02e	27	#include <sys/socket.h>
83723896 FT	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <log.h>
	33	#include <utils.h>
	34	#include <mt.h>
	35	#include <mtio.h>
	36
16accb88 FT	37	static struct blocker *blockers;
	38
	39	#ifdef HAVE_EPOLL
	40
	41	/*
	42	* Support for epoll. Optimally, different I/O loops should be split
	43	* into different files for greater clarity, but I'll save that fun
	44	* for another day.
	45	*
	46	* Scroll down to #else for the normal select loop.
	47	*/
	48
	49	#include <sys/epoll.h>
	50
	51	struct blocker {
	52	struct blocker n, p, n2, p2;
	53	int fd, reg;
	54	int ev;
	55	time_t to;
	56	struct muth *th;
	57	};
	58
	59	static int epfd = -1, fdln = 0;
	60	static struct blocker **fdlist;
	61
	62	static int regfd(struct blocker *bl)
	63	{
	64	struct blocker *o;
	65	struct epoll_event evd;
	66
	67	evd.events = 0;
	68	if(bl->ev & EV_READ)
	69	evd.events \|= EPOLLIN;
	70	if(bl->ev & EV_WRITE)
	71	evd.events \|= EPOLLOUT;
	72	evd.data.fd = bl->fd;
	73	if(bl->fd >= fdln) {
	74	if(fdlist) {
	75	fdlist = srealloc(fdlist, sizeof(fdlist) (bl->fd + 1));
	76	memset(fdlist + fdln, 0, sizeof(fdlist) (bl->fd + 1 - fdln));
	77	fdln = bl->fd + 1;
	78	} else {
	79	fdlist = szmalloc(sizeof(fdlist) (fdln = (bl->fd + 1)));
	80	}
	81	}
	82	if(fdlist[bl->fd] == NULL) {
	83	if(epoll_ctl(epfd, EPOLL_CTL_ADD, bl->fd, &evd)) {
	84	/* XXX?! Whatever to do, really? */
	85	flog(LOG_ERR, "epoll_add on fd %i: %s", bl->fd, strerror(errno));
	86	return(-1);
	87	}
	88	} else {
	89	for(o = fdlist[bl->fd]; o; o = o->n2) {
	90	if(o->ev & EV_READ)
	91	evd.events \|= EPOLLIN;
	92	if(o->ev & EV_WRITE)
	93	evd.events \|= EPOLLOUT;
	94	}
	95	if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
	96	/* XXX?! Whatever to do, really? */
	97	flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
	98	return(-1);
	99	}
	100	}
101	bl->n2 = fdlist[bl->fd];
102	bl->p2 = NULL;
103	if(fdlist[bl->fd] != NULL)
104	fdlist[bl->fd]->p2 = bl;
105	fdlist[bl->fd] = bl;
106	bl->reg = 1;
107	return(0);
108	}
109
110	static void remfd(struct blocker *bl)
111	{
112	struct blocker *o;
113	struct epoll_event evd;
114
115	if(!bl->reg)
116	return;
117	if(bl->n2)
118	bl->n2->p2 = bl->p2;
119	if(bl->p2)
120	bl->p2->n2 = bl->n2;
121	if(bl == fdlist[bl->fd])
122	fdlist[bl->fd] = bl->n2;
123	if(fdlist[bl->fd] == NULL) {
124	if(epoll_ctl(epfd, EPOLL_CTL_DEL, bl->fd, NULL))
125	flog(LOG_ERR, "epoll_del on fd %i: %s", bl->fd, strerror(errno));
126	} else {
127	evd.events = 0;
128	evd.data.fd = bl->fd;
129	for(o = fdlist[bl->fd]; o; o = o->n2) {
130	if(o->ev & EV_READ)
131	evd.events \|= EPOLLIN;
132	if(o->ev & EV_WRITE)
133	evd.events \|= EPOLLOUT;
134	}
135	if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
136	/* XXX?! Whatever to do, really? */
137	flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
138	}
139	}
140	}
141
142	int block(int fd, int ev, time_t to)
143	{
144	struct blocker *bl;
145	int rv;
146
147	omalloc(bl);
148	bl->fd = fd;
149	bl->ev = ev;
150	if(to > 0)
151	bl->to = time(NULL) + to;
152	bl->th = current;
153	if((epfd >= 0) && regfd(bl)) {
154	free(bl);
155	return(-1);
156	}
157	bl->n = blockers;
158	if(blockers)
159	blockers->p = bl;
160	blockers = bl;
161	rv = yield();
162	if(bl->n)
163	bl->n->p = bl->p;
164	if(bl->p)
165	bl->p->n = bl->n;
166	if(bl == blockers)
167	blockers = bl->n;
168	remfd(bl);
169	free(bl);
170	return(rv);
171	}
172
173	void ioloop(void)
174	{
175	struct blocker bl, nbl;
176	struct epoll_event evr[16];
177	int i, fd, nev, ev;
178	time_t now, timeout;
179
180	epfd = epoll_create(128);
181	for(bl = blockers; bl; bl = nbl) {
182	nbl = bl->n;
183	if(regfd(bl))
184	resume(bl->th, -1);
185	}
186	while(blockers != NULL) {
187	timeout = 0;
188	for(bl = blockers; bl; bl = bl->n) {
189	if((bl->to != 0) && ((timeout == 0) \|\| (timeout > bl->to)))
190	timeout = bl->to;
191	}
192	now = time(NULL);
193	nev = epoll_wait(epfd, evr, sizeof(evr) / sizeof(evr), timeout?((timeout - now) 1000):-1);
194	if(nev < 0) {
195	if(errno != EINTR) {
196	flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno));
197	/* To avoid CPU hogging in case it's bad, which it
198	* probably is. */
199	sleep(1);
200	}
201	continue;
202	}
203	now = time(NULL);
204	for(i = 0; i < nev; i++) {
205	fd = evr[i].data.fd;
206	ev = 0;
207	if(evr[i].events & EPOLLIN)
208	ev \|= EV_READ;
209	if(evr[i].events & EPOLLOUT)
210	ev \|= EV_WRITE;
211	if(evr[i].events & ~(EPOLLIN \| EPOLLOUT))
212	ev = -1;
213	for(bl = fdlist[fd]; bl; bl = nbl) {
214	nbl = bl->n2;
215	if((ev < 0) \|\| (ev & bl->ev))
216	resume(bl->th, ev);
217	else if((bl->to != 0) && (bl->to <= now))
218	resume(bl->th, 0);
219	}
220	}
221	}
222	close(epfd);
223	epfd = -1;
224	}
225
226	#else
227
83723896 FT	228	struct blocker {
	229	struct blocker n, p;
	230	int fd;
	231	int ev;
	232	time_t to;
	233	struct muth *th;
	234	};
	235
83723896 FT	236	int block(int fd, int ev, time_t to)
	237	{
	238	struct blocker *bl;
	239	int rv;
	240
	241	omalloc(bl);
	242	bl->fd = fd;
	243	bl->ev = ev;
	244	if(to > 0)
	245	bl->to = time(NULL) + to;
	246	bl->th = current;
	247	bl->n = blockers;
	248	if(blockers)
	249	blockers->p = bl;
	250	blockers = bl;
	251	rv = yield();
	252	if(bl->n)
	253	bl->n->p = bl->p;
	254	if(bl->p)
	255	bl->p->n = bl->n;
	256	if(bl == blockers)
	257	blockers = bl->n;
96fc434a	258	free(bl);
83723896 FT	259	return(rv);
	260	}
	261
	262	void ioloop(void)
	263	{
	264	int ret;
	265	fd_set rfds, wfds, efds;
	266	struct blocker bl, nbl;
	267	struct timeval toval;
	268	time_t now, timeout;
	269	int maxfd;
	270	int ev;
	271
	272	while(blockers != NULL) {
	273	FD_ZERO(&rfds);
	274	FD_ZERO(&wfds);
	275	FD_ZERO(&efds);
	276	maxfd = 0;
	277	now = time(NULL);
	278	timeout = 0;
	279	for(bl = blockers; bl; bl = bl->n) {
	280	if(bl->ev & EV_READ)
	281	FD_SET(bl->fd, &rfds);
	282	if(bl->ev & EV_WRITE)
	283	FD_SET(bl->fd, &wfds);
	284	FD_SET(bl->fd, &efds);
	285	if(bl->fd > maxfd)
	286	maxfd = bl->fd;
	287	if((bl->to != 0) && ((timeout == 0) \|\| (timeout > bl->to)))
	288	timeout = bl->to;
	289	}
	290	toval.tv_sec = timeout - now;
	291	toval.tv_usec = 0;
	292	ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL);
	293	if(ret < 0) {
	294	if(errno != EINTR) {
	295	flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno));
	296	/* To avoid CPU hogging in case it's bad, which it
	297	* probably is. */
	298	sleep(1);
	299	}
	300	}
	301	now = time(NULL);
	302	for(bl = blockers; bl; bl = nbl) {
	303	nbl = bl->n;
	304	ev = 0;
	305	if(FD_ISSET(bl->fd, &rfds))
	306	ev \|= EV_READ;
	307	if(FD_ISSET(bl->fd, &wfds))
	308	ev \|= EV_WRITE;
	309	if(FD_ISSET(bl->fd, &efds))
	310	ev = -1;
3dc69b45	311	if((ev < 0) \|\| (ev & bl->ev))
83723896 FT	312	resume(bl->th, ev);
	313	else if((bl->to != 0) && (bl->to <= now))
	314	resume(bl->th, 0);
	315	}
	316	}
	317	}
e1cdf02e	318
16accb88 FT	319	#endif
16accb88 FT	320
e1cdf02e FT	321	struct stdiofd {
	322	int fd;
	323	int sock;
	324	int timeout;
	325	};
	326
	327	static ssize_t mtread(void cookie, char buf, size_t len)
	328	{
	329	struct stdiofd *d = cookie;
	330	int ev;
	331	ssize_t ret;
	332
	333	while(1) {
	334	ret = read(d->fd, buf, len);
	335	if((ret < 0) && (errno == EAGAIN)) {
	336	ev = block(d->fd, EV_READ, d->timeout);
	337	if(ev < 0) {
	338	/* If we just go on, we should get the real error. */
	339	continue;
	340	} else if(ev == 0) {
	341	errno = ETIMEDOUT;
	342	return(-1);
	343	} else {
	344	continue;
	345	}
	346	} else {
	347	return(ret);
	348	}
	349	}
	350	}
	351
	352	static ssize_t mtwrite(void cookie, const char buf, size_t len)
	353	{
	354	struct stdiofd *d = cookie;
	355	int ev;
9dc25d3d	356	size_t off;
e1cdf02e FT	357	ssize_t ret;
e1cdf02e FT	358
9dc25d3d FT	359	off = 0;
9dc25d3d FT	360	while(off < len) {
e1cdf02e	361	if(d->sock)
9dc25d3d	362	ret = send(d->fd, buf + off, len - off, MSG_DONTWAIT \| MSG_NOSIGNAL);
e1cdf02e	363	else
9dc25d3d FT	364	ret = write(d->fd, buf + off, len - off);
	365	if(ret < 0) {
	366	if(errno == EAGAIN) {
	367	ev = block(d->fd, EV_WRITE, d->timeout);
	368	if(ev < 0) {
	369	/* If we just go on, we should get the real error. */
	370	continue;
	371	} else if(ev == 0) {
	372	errno = ETIMEDOUT;
	373	return(off);
	374	} else {
	375	continue;
	376	}
e1cdf02e	377	} else {
9dc25d3d	378	return(off);
e1cdf02e FT	379	}
e1cdf02e FT	380	} else {
9dc25d3d	381	off += ret;
e1cdf02e FT	382	}
e1cdf02e FT	383	}
9dc25d3d	384	return(off);
e1cdf02e FT	385	}
	386
	387	static int mtclose(void *cookie)
	388	{
	389	struct stdiofd *d = cookie;
	390
	391	close(d->fd);
	392	free(d);
	393	return(0);
	394	}
	395
	396	static cookie_io_functions_t iofuns = {
	397	.read = mtread,
	398	.write = mtwrite,
	399	.close = mtclose,
	400	};
	401
	402	FILE mtstdopen(int fd, int issock, int timeout, char mode)
	403	{
	404	struct stdiofd *d;
	405	FILE *ret;
	406
	407	omalloc(d);
	408	d->fd = fd;
	409	d->sock = issock;
	410	d->timeout = timeout;
	411	ret = fopencookie(d, mode, iofuns);
	412	if(!ret)
	413	free(d);
	414	else
	415	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) \| O_NONBLOCK);
	416	return(ret);
	417	}