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/*
* Copyright (C) 2002-2004 Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#if (HAVE_KQUEUE)
ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
{
u_char *prev;
ssize_t n, size;
ngx_err_t err;
ngx_array_t io;
ngx_event_t *rev;
struct iovec *iov;
rev = c->read;
if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"readv: eof:%d, avail:%d, err:%d",
rev->pending_eof, rev->available, rev->kq_errno);
if (rev->available == 0) {
if (rev->pending_eof) {
rev->ready = 0;
rev->eof = 1;
ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno,
"kevent() reported about an closed connection");
if (rev->kq_errno) {
rev->error = 1;
ngx_set_socket_errno(rev->kq_errno);
return NGX_ERROR;
}
return 0;
} else {
return NGX_AGAIN;
}
}
}
prev = NULL;
iov = NULL;
size = 0;
ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_ERROR);
/* coalesce the neighbouring bufs */
while (chain) {
if (prev == chain->buf->last) {
iov->iov_len += chain->buf->end - chain->buf->last;
} else {
ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
iov->iov_base = (void *) chain->buf->last;
iov->iov_len = chain->buf->end - chain->buf->last;
}
size += chain->buf->end - chain->buf->last;
prev = chain->buf->end;
chain = chain->next;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"readv: %d, last:%d", io.nelts, iov->iov_len);
rev = c->read;
do {
n = readv(c->fd, (struct iovec *) io.elts, io.nelts);
if (n >= 0) {
if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
rev->available -= n;
/*
* rev->available can be negative here because some additional
* bytes can be received between kevent() and recv()
*/
if (rev->available <= 0) {
if (!rev->pending_eof) {
rev->ready = 0;
}
if (rev->available < 0) {
rev->available = 0;
}
}
return n;
}
if (n < size) {
rev->ready = 0;
}
if (n == 0) {
rev->eof = 1;
}
return n;
}
err = ngx_socket_errno;
if (err == NGX_EAGAIN || err == NGX_EINTR) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"readv() not ready");
n = NGX_AGAIN;
} else {
n = ngx_connection_error(c, err, "readv() failed");
break;
}
} while (err == NGX_EINTR);
rev->ready = 0;
if (n == NGX_ERROR){
c->read->error = 1;
}
return n;
}
#else /* ! NAVE_KQUEUE */
ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain)
{
u_char *prev;
ssize_t n, size;
ngx_err_t err;
ngx_array_t io;
ngx_event_t *rev;
struct iovec *iov;
prev = NULL;
iov = NULL;
size = 0;
ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_ERROR);
/* coalesce the neighbouring bufs */
while (chain) {
if (prev == chain->buf->last) {
iov->iov_len += chain->buf->end - chain->buf->last;
} else {
ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
iov->iov_base = chain->buf->last;
iov->iov_len = chain->buf->end - chain->buf->last;
}
size += chain->buf->end - chain->buf->last;
prev = chain->buf->end;
chain = chain->next;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"readv: %d:%d", io.nelts, iov->iov_len);
rev = c->read;
do {
n = readv(c->fd, (struct iovec *) io.elts, io.nelts);
if (n == 0) {
rev->ready = 0;
rev->eof = 1;
return n;
} else if (n > 0) {
if (n < size && !(ngx_event_flags & NGX_HAVE_GREEDY_EVENT)) {
rev->ready = 0;
}
return n;
}
err = ngx_socket_errno;
if (err == NGX_EAGAIN || err == NGX_EINTR) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"readv() not ready");
n = NGX_AGAIN;
} else {
n = ngx_connection_error(c, err, "readv() failed");
break;
}
} while (err == NGX_EINTR);
rev->ready = 0;
if (n == NGX_ERROR){
c->read->error = 1;
}
return n;
}
#endif /* NAVE_KQUEUE */
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