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[MEDIUM] started the changes towards I/O completion callbacks

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Now the event_* functions find their buffer in the fdtab itself.
This commit is contained in:
Willy Tarreau 2006-07-29 16:59:06 +02:00
parent 1da7a77031
commit 5446940e37
10 changed files with 71 additions and 484 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/proto/buffers.h
View File

@ -25,6 +25,16 @@
#include <common/config.h>
#include <types/buffers.h>
/* Initializes all fields in the buffer. The ->rlim field is initialized last
* so that the compiler can optimize it away if changed immediately after the
* call to this function.
*/
static inline void buffer_init(struct buffer *buf)
{
buf->l = buf->total = buf->flags = 0;
buf->rlim = buf->h = buf->r = buf->lr = buf->w = buf->data;
}
/* returns 1 if the buffer is empty, 0 otherwise */
static inline int buffer_isempty(struct buffer *buf)
{

19
include/types/buffers.h
View File

@ -25,6 +25,24 @@
#include <common/config.h>
#include <common/memory.h>
#include <stdint.h>
/* The BF_* macros designate Buffer Flags, which may be ORed in the bit field
* member 'flags' in struct buffer.
*/
#define BF_SHUTR_PENDING 1
#define BF_SHUTR_DONE 2
#define BF_SHUTW_PENDING 4
#define BF_SHUTW_DONE 8
#define BF_PARTIAL_READ 16
#define BF_COMPLETE_READ 32
#define BF_READ_ERROR 64
#define BF_PARTIAL_WRITE 128
#define BF_COMPLETE_WRITE 256
#define BF_WRITE_ERROR 512
/* describes a chunk of string */
struct chunk {
char *str; /* beginning of the string itself. Might not be 0-terminated */
@ -32,6 +50,7 @@ struct chunk {
};
struct buffer {
u_int32_t flags;
unsigned int l; /* data length */
char *r, *w, *h, *lr; /* read ptr, write ptr, last header ptr, last read */
char *rlim; /* read limit, used for header rewriting */

16
include/types/fd.h
View File

@ -28,6 +28,7 @@
#include <common/config.h>
#include <types/task.h>
#include <types/buffers.h>
/* different possible states for the fd */
#define FD_STCLOSE 0
@ -36,13 +37,20 @@
#define FD_STREADY 3
#define FD_STERROR 4
enum {
DIR_RD=0,
DIR_WR=1,
DIR_SIZE
};
/* info about one given fd */
struct fdtab {
int (*read)(int fd); /* read function */
int (*write)(int fd); /* write function */
struct task *owner; /* the session (or proxy) associated with this fd */
int state; /* the state of this fd */
struct {
int (*f)(int fd); /* read/write function */
struct buffer *b; /* read/write buffer */
} cb[DIR_SIZE];
struct task *owner; /* the session (or proxy) associated with this fd */
int state; /* the state of this fd */
};
extern struct fdtab *fdtab; /* array of all the file descriptors */

6
src/backend.c
View File

@ -426,9 +426,11 @@ int connect_server(struct session *s)
}
fdtab[fd].owner = s->task;
fdtab[fd].read = &event_srv_read;
fdtab[fd].write = &event_srv_write;
fdtab[fd].state = FD_STCONN; /* connection in progress */
fdtab[fd].cb[DIR_RD].f = &event_srv_read;
fdtab[fd].cb[DIR_RD].b = s->rep;
fdtab[fd].cb[DIR_WR].f = &event_srv_write;
fdtab[fd].cb[DIR_WR].b = s->req;
FD_SET(fd, StaticWriteEvent); /* for connect status */
#if defined(DEBUG_FULL) && defined(ENABLE_EPOLL)

6
src/checks.c
View File

@ -280,8 +280,10 @@ int process_chk(struct task *t)
s->curfd = fd; /* that's how we know a test is in progress ;-) */
fdtab[fd].owner = t;
fdtab[fd].read = &event_srv_chk_r;
fdtab[fd].write = &event_srv_chk_w;
fdtab[fd].cb[DIR_RD].f = &event_srv_chk_r;
fdtab[fd].cb[DIR_RD].b = NULL;
fdtab[fd].cb[DIR_WR].f = &event_srv_chk_w;
fdtab[fd].cb[DIR_WR].b = NULL;
fdtab[fd].state = FD_STCONN; /* connection in progress */
FD_SET(fd, StaticWriteEvent); /* for connect status */
#ifdef DEBUG_FULL

18
src/client.c
View File

@ -33,6 +33,7 @@
#include <types/server.h>
#include <types/session.h>
#include <proto/buffers.h>
#include <proto/client.h>
#include <proto/fd.h>
#include <proto/log.h>
@ -309,10 +310,8 @@ int event_accept(int fd) {
return 0;
}
s->req->l = 0;
s->req->total = 0;
s->req->h = s->req->r = s->req->lr = s->req->w = s->req->data; /* r and w will be reset further */
s->req->rlim = s->req->data + BUFSIZE;
buffer_init(s->req);
s->req->rlim += BUFSIZE;
if (s->cli_state == CL_STHEADERS) /* reserve some space for header rewriting */
s->req->rlim -= MAXREWRITE;
@ -327,14 +326,15 @@ int event_accept(int fd) {
pool_free(session, s);
return 0;
}
s->rep->l = 0;
s->rep->total = 0;
s->rep->h = s->rep->r = s->rep->lr = s->rep->w = s->rep->rlim = s->rep->data;
fdtab[cfd].read = &event_cli_read;
fdtab[cfd].write = &event_cli_write;
buffer_init(s->rep);
fdtab[cfd].owner = t;
fdtab[cfd].state = FD_STREADY;
fdtab[cfd].cb[DIR_RD].f = &event_cli_read;
fdtab[cfd].cb[DIR_RD].b = s->req;
fdtab[cfd].cb[DIR_WR].f = &event_cli_write;
fdtab[cfd].cb[DIR_WR].b = s->rep;
if ((p->mode == PR_MODE_HTTP && (s->flags & SN_MONITOR)) ||
(p->mode == PR_MODE_HEALTH && (p->options & PR_O_HTTP_CHK)))

12
src/fd.c
View File

@ -222,14 +222,14 @@ int epoll_loop(int action)
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (epoll_events[count].events & ( EPOLLIN | EPOLLERR | EPOLLHUP ))
fdtab[fd].read(fd);
fdtab[fd].cb[DIR_RD].f(fd);
}
if (FD_ISSET(fd, StaticWriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (epoll_events[count].events & ( EPOLLOUT | EPOLLERR | EPOLLHUP ))
fdtab[fd].write(fd);
fdtab[fd].cb[DIR_WR].f(fd);
}
}
}
@ -334,14 +334,14 @@ int poll_loop(int action)
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLIN | POLLERR | POLLHUP ))
fdtab[fd].read(fd);
fdtab[fd].cb[DIR_RD].f(fd);
}
if (FD_ISSET(fd, StaticWriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLOUT | POLLERR | POLLHUP ))
fdtab[fd].write(fd);
fdtab[fd].cb[DIR_WR].f(fd);
}
}
}
@ -451,13 +451,13 @@ int select_loop(int action)
if (FD_ISSET(fd, ReadEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
fdtab[fd].read(fd);
fdtab[fd].cb[DIR_RD].f(fd);
}
if (FD_ISSET(fd, WriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
fdtab[fd].write(fd);
fdtab[fd].cb[DIR_WR].f(fd);
}
}
}

455
src/polling.c
View File

@ -1,455 +0,0 @@
/*
* File descriptors management functions.
*
* Copyright 2000-2006 Willy Tarreau <w@1wt.eu>
*
* 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
* 2 of the License, or (at your option) any later version.
*
*/
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/time.h>
#include <types/fd.h>
#include <types/global.h>
#include <types/polling.h>
#include <proto/task.h>
fd_set *StaticReadEvent, *StaticWriteEvent;
int cfg_polling_mechanism = 0; /* POLL_USE_{SELECT|POLL|EPOLL} */
/*
* FIXME: this is dirty, but at the moment, there's no other solution to remove
* the old FDs from outside the loop. Perhaps we should export a global 'poll'
* structure with pointers to functions such as init_fd() and close_fd(), plus
* a private structure with several pointers to places such as below.
*/
#if defined(ENABLE_EPOLL)
fd_set *PrevReadEvent = NULL, *PrevWriteEvent = NULL;
#if defined(USE_MY_EPOLL)
_syscall1 (int, epoll_create, int, size);
_syscall4 (int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event);
_syscall4 (int, epoll_wait, int, epfd, struct epoll_event *, events, int, maxevents, int, timeout);
#endif
#endif
#if defined(ENABLE_EPOLL)
/*
* Main epoll() loop.
* does 3 actions :
* 0 (POLL_LOOP_ACTION_INIT) : initializes necessary private structures
* 1 (POLL_LOOP_ACTION_RUN) : runs the loop
* 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
*
* returns 0 if initialization failed, !0 otherwise.
*/
int epoll_loop(int action)
{
int next_time;
int status;
int fd;
int fds, count;
int pr, pw, sr, sw;
unsigned rn, ro, wn, wo; /* read new, read old, write new, write old */
struct epoll_event ev;
/* private data */
static struct epoll_event *epoll_events = NULL;
static int epoll_fd;
if (action == POLL_LOOP_ACTION_INIT) {
epoll_fd = epoll_create(global.maxsock + 1);
if (epoll_fd < 0)
return 0;
else {
epoll_events = (struct epoll_event*)
calloc(1, sizeof(struct epoll_event) * global.maxsock);
PrevReadEvent = (fd_set *)
calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
PrevWriteEvent = (fd_set *)
calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
}
return 1;
}
else if (action == POLL_LOOP_ACTION_CLEAN) {
if (PrevWriteEvent) free(PrevWriteEvent);
if (PrevReadEvent) free(PrevReadEvent);
if (epoll_events) free(epoll_events);
close(epoll_fd);
epoll_fd = 0;
return 1;
}
/* OK, it's POLL_LOOP_ACTION_RUN */
tv_now(&now);
while (1) {
next_time = process_runnable_tasks();
/* stop when there's no connection left and we don't allow them anymore */
if (!actconn && listeners == 0)
break;
for (fds = 0; (fds << INTBITS) < maxfd; fds++) {
rn = ((int*)StaticReadEvent)[fds]; ro = ((int*)PrevReadEvent)[fds];
wn = ((int*)StaticWriteEvent)[fds]; wo = ((int*)PrevWriteEvent)[fds];
if ((ro^rn) | (wo^wn)) {
for (count = 0, fd = fds << INTBITS; count < (1<<INTBITS) && fd < maxfd; count++, fd++) {
#define FDSETS_ARE_INT_ALIGNED
#ifdef FDSETS_ARE_INT_ALIGNED
#define WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
#ifdef WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
pr = (ro >> count) & 1;
pw = (wo >> count) & 1;
sr = (rn >> count) & 1;
sw = (wn >> count) & 1;
#else
pr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&ro);
pw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wo);
sr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&rn);
sw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wn);
#endif
#else
pr = FD_ISSET(fd, PrevReadEvent);
pw = FD_ISSET(fd, PrevWriteEvent);
sr = FD_ISSET(fd, StaticReadEvent);
sw = FD_ISSET(fd, StaticWriteEvent);
#endif
if (!((sr^pr) | (sw^pw)))
continue;
ev.events = (sr ? EPOLLIN : 0) | (sw ? EPOLLOUT : 0);
ev.data.fd = fd;
#ifdef EPOLL_CTL_MOD_WORKAROUND
/* I encountered a rarely reproducible problem with
* EPOLL_CTL_MOD where a modified FD (systematically
* the one in epoll_events[0], fd#7) would sometimes
* be set EPOLL_OUT while asked for a read ! This is
* with the 2.4 epoll patch. The workaround is to
* delete then recreate in case of modification.
* This is in 2.4 up to epoll-lt-0.21 but not in 2.6
* nor RHEL kernels.
*/
if ((pr | pw) && fdtab[fd].state != FD_STCLOSE)
epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ev);
if ((sr | sw))
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev);
#else
if ((pr | pw)) {
/* the file-descriptor already exists... */
if ((sr | sw)) {
/* ...and it will still exist */
if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ev) < 0) {
// perror("epoll_ctl(MOD)");
// exit(1);
}
} else {
/* ...and it will be removed */
if (fdtab[fd].state != FD_STCLOSE &&
epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ev) < 0) {
// perror("epoll_ctl(DEL)");
// exit(1);
}
}
} else {
/* the file-descriptor did not exist, let's add it */
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
// perror("epoll_ctl(ADD)");
// exit(1);
}
}
#endif // EPOLL_CTL_MOD_WORKAROUND
}
((int*)PrevReadEvent)[fds] = rn;
((int*)PrevWriteEvent)[fds] = wn;
}
}
/* now let's wait for events */
status = epoll_wait(epoll_fd, epoll_events, maxfd, next_time);
tv_now(&now);
for (count = 0; count < status; count++) {
fd = epoll_events[count].data.fd;
if (FD_ISSET(fd, StaticReadEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (epoll_events[count].events & ( EPOLLIN | EPOLLERR | EPOLLHUP ))
fdtab[fd].read(fd);
}
if (FD_ISSET(fd, StaticWriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (epoll_events[count].events & ( EPOLLOUT | EPOLLERR | EPOLLHUP ))
fdtab[fd].write(fd);
}
}
}
return 1;
}
#endif
#if defined(ENABLE_POLL)
/*
* Main poll() loop.
* does 3 actions :
* 0 (POLL_LOOP_ACTION_INIT) : initializes necessary private structures
* 1 (POLL_LOOP_ACTION_RUN) : runs the loop
* 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
*
* returns 0 if initialization failed, !0 otherwise.
*/
int poll_loop(int action)
{
int next_time;
int status;
int fd, nbfd;
int fds, count;
int sr, sw;
unsigned rn, wn; /* read new, write new */
/* private data */
static struct pollfd *poll_events = NULL;
if (action == POLL_LOOP_ACTION_INIT) {
poll_events = (struct pollfd*)
calloc(1, sizeof(struct pollfd) * global.maxsock);
return 1;
}
else if (action == POLL_LOOP_ACTION_CLEAN) {
if (poll_events)
free(poll_events);
return 1;
}
/* OK, it's POLL_LOOP_ACTION_RUN */
tv_now(&now);
while (1) {
next_time = process_runnable_tasks();
/* stop when there's no connection left and we don't allow them anymore */
if (!actconn && listeners == 0)
break;
nbfd = 0;
for (fds = 0; (fds << INTBITS) < maxfd; fds++) {
rn = ((int*)StaticReadEvent)[fds];
wn = ((int*)StaticWriteEvent)[fds];
if ((rn|wn)) {
for (count = 0, fd = fds << INTBITS; count < (1<<INTBITS) && fd < maxfd; count++, fd++) {
#define FDSETS_ARE_INT_ALIGNED
#ifdef FDSETS_ARE_INT_ALIGNED
#define WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
#ifdef WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
sr = (rn >> count) & 1;
sw = (wn >> count) & 1;
#else
sr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&rn);
sw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wn);
#endif
#else
sr = FD_ISSET(fd, StaticReadEvent);
sw = FD_ISSET(fd, StaticWriteEvent);
#endif
if ((sr|sw)) {
poll_events[nbfd].fd = fd;
poll_events[nbfd].events = (sr ? POLLIN : 0) | (sw ? POLLOUT : 0);
nbfd++;
}
}
}
}
/* now let's wait for events */
status = poll(poll_events, nbfd, next_time);
tv_now(&now);
for (count = 0; status > 0 && count < nbfd; count++) {
fd = poll_events[count].fd;
if (!(poll_events[count].revents & ( POLLOUT | POLLIN | POLLERR | POLLHUP )))
continue;
/* ok, we found one active fd */
status--;
if (FD_ISSET(fd, StaticReadEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLIN | POLLERR | POLLHUP ))
fdtab[fd].read(fd);
}
if (FD_ISSET(fd, StaticWriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLOUT | POLLERR | POLLHUP ))
fdtab[fd].write(fd);
}
}
}
return 1;
}
#endif
/*
* Main select() loop.
* does 3 actions :
* 0 (POLL_LOOP_ACTION_INIT) : initializes necessary private structures
* 1 (POLL_LOOP_ACTION_RUN) : runs the loop
* 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
*
* returns 0 if initialization failed, !0 otherwise.
*/
int select_loop(int action)
{
int next_time;
int status;
int fd,i;
struct timeval delta;
int readnotnull, writenotnull;
static fd_set *ReadEvent = NULL, *WriteEvent = NULL;
if (action == POLL_LOOP_ACTION_INIT) {
ReadEvent = (fd_set *)
calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
WriteEvent = (fd_set *)
calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
return 1;
}
else if (action == POLL_LOOP_ACTION_CLEAN) {
if (WriteEvent) free(WriteEvent);
if (ReadEvent) free(ReadEvent);
return 1;
}
/* OK, it's POLL_LOOP_ACTION_RUN */
tv_now(&now);
while (1) {
next_time = process_runnable_tasks();
/* stop when there's no connection left and we don't allow them anymore */
if (!actconn && listeners == 0)
break;
if (next_time > 0) { /* FIXME */
/* Convert to timeval */
/* to avoid eventual select loops due to timer precision */
next_time += SCHEDULER_RESOLUTION;
delta.tv_sec = next_time / 1000;
delta.tv_usec = (next_time % 1000) * 1000;
}
else if (next_time == 0) { /* allow select to return immediately when needed */
delta.tv_sec = delta.tv_usec = 0;
}
/* let's restore fdset state */
readnotnull = 0; writenotnull = 0;
for (i = 0; i < (maxfd + FD_SETSIZE - 1)/(8*sizeof(int)); i++) {
readnotnull |= (*(((int*)ReadEvent)+i) = *(((int*)StaticReadEvent)+i)) != 0;
writenotnull |= (*(((int*)WriteEvent)+i) = *(((int*)StaticWriteEvent)+i)) != 0;
}
// /* just a verification code, needs to be removed for performance */
// for (i=0; i<maxfd; i++) {
// if (FD_ISSET(i, ReadEvent) != FD_ISSET(i, StaticReadEvent))
// abort();
// if (FD_ISSET(i, WriteEvent) != FD_ISSET(i, StaticWriteEvent))
// abort();
//
// }
status = select(maxfd,
readnotnull ? ReadEvent : NULL,
writenotnull ? WriteEvent : NULL,
NULL,
(next_time >= 0) ? &delta : NULL);
/* this is an experiment on the separation of the select work */
// status = (readnotnull ? select(maxfd, ReadEvent, NULL, NULL, (next_time >= 0) ? &delta : NULL) : 0);
// status |= (writenotnull ? select(maxfd, NULL, WriteEvent, NULL, (next_time >= 0) ? &delta : NULL) : 0);
tv_now(&now);
if (status > 0) { /* must proceed with events */
int fds;
char count;
for (fds = 0; (fds << INTBITS) < maxfd; fds++)
if ((((int *)(ReadEvent))[fds] | ((int *)(WriteEvent))[fds]) != 0)
for (count = 1<<INTBITS, fd = fds << INTBITS; count && fd < maxfd; count--, fd++) {
/* if we specify read first, the accepts and zero reads will be
* seen first. Moreover, system buffers will be flushed faster.
*/
if (FD_ISSET(fd, ReadEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
fdtab[fd].read(fd);
}
if (FD_ISSET(fd, WriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
fdtab[fd].write(fd);
}
}
}
else {
// fprintf(stderr,"select returned %d, maxfd=%d\n", status, maxfd);
}
}
return 1;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/

5
src/proxy.c
View File

@ -123,8 +123,9 @@ int start_proxies(int verbose)
listener->fd = fd;
/* the function for the accept() event */
fdtab[fd].read = &event_accept;
fdtab[fd].write = NULL; /* never called */
fdtab[fd].cb[DIR_RD].f = &event_accept;
fdtab[fd].cb[DIR_WR].f = NULL; /* never called */
fdtab[fd].cb[DIR_RD].b = fdtab[fd].cb[DIR_WR].b = NULL;
fdtab[fd].owner = (struct task *)curproxy; /* reference the proxy instead of a task */
fdtab[fd].state = FD_STLISTEN;
FD_SET(fd, StaticReadEvent);

8
src/stream_sock.c
View File

@ -46,8 +46,8 @@
*/
int event_cli_read(int fd) {
struct task *t = fdtab[fd].owner;
struct buffer *b = fdtab[fd].cb[DIR_RD].b;
struct session *s = t->context;
struct buffer *b = s->req;
int ret, max;
#ifdef DEBUG_FULL
@ -151,8 +151,8 @@ int event_cli_read(int fd) {
*/
int event_cli_write(int fd) {
struct task *t = fdtab[fd].owner;
struct buffer *b = fdtab[fd].cb[DIR_WR].b;
struct session *s = t->context;
struct buffer *b = s->rep;
int ret, max;
#ifdef DEBUG_FULL
@ -243,8 +243,8 @@ int event_cli_write(int fd) {
*/
int event_srv_read(int fd) {
struct task *t = fdtab[fd].owner;
struct buffer *b = fdtab[fd].cb[DIR_RD].b;
struct session *s = t->context;
struct buffer *b = s->rep;
int ret, max;
#ifdef DEBUG_FULL
@ -348,8 +348,8 @@ int event_srv_read(int fd) {
*/
int event_srv_write(int fd) {
struct task *t = fdtab[fd].owner;
struct buffer *b = fdtab[fd].cb[DIR_WR].b;
struct session *s = t->context;
struct buffer *b = s->req;
int ret, max;
#ifdef DEBUG_FULL