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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
/*
* On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit
* offsets only and the including <sys/sendfile.h> breaks building if
* off_t is 64 bit wide. So we use own sendfile() definition where offset
* parameter is int32_t and use sendfile() with the file parts below 2G.
*
* Linux 2.4.21 has a new sendfile64() syscall #239.
*/
ngx_chain_t *ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in)
{
int rc;
char *prev;
off_t fprev;
size_t size, fsize, sent;
ngx_int_t use_cork, eintr;
struct iovec *iov;
ngx_err_t err;
ngx_hunk_t *file;
ngx_array_t header;
ngx_event_t *wev;
ngx_chain_t *cl, *tail;
#if (HAVE_SENDFILE64)
off_t offset;
#else
int32_t offset;
#endif
wev = c->write;
if (!wev->ready) {
return in;
}
do {
file = NULL;
fsize = 0;
eintr = 0;
ngx_init_array(header, c->pool, 10, sizeof(struct iovec),
NGX_CHAIN_ERROR);
prev = NULL;
iov = NULL;
/* create the iovec and coalesce the neighbouring hunks */
for (cl = in; cl; cl = cl->next) {
if (ngx_hunk_special(cl->hunk)) {
continue;
}
if (!ngx_hunk_in_memory_only(cl->hunk)) {
break;
}
if (prev == cl->hunk->pos) {
iov->iov_len += cl->hunk->last - cl->hunk->pos;
} else {
ngx_test_null(iov, ngx_push_array(&header), NGX_CHAIN_ERROR);
iov->iov_base = cl->hunk->pos;
iov->iov_len = cl->hunk->last - cl->hunk->pos;
}
prev = cl->hunk->last;
}
/* set TCP_CORK if there is a header before a file */
if (!c->tcp_nopush
&& header.nelts != 0
&& cl
&& cl->hunk->type & NGX_HUNK_FILE)
{
c->tcp_nopush = 1;
ngx_log_debug(c->log, "CORK");
if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
ngx_log_error(NGX_LOG_CRIT, c->log, ngx_errno,
ngx_tcp_nopush_n " failed");
return NGX_CHAIN_ERROR;
}
}
if (header.nelts == 0 && cl && cl->hunk->type & NGX_HUNK_FILE) {
/* get the file hunk */
file = cl->hunk;
fsize = (size_t) (file->file_last - file->file_pos);
fprev = file->file_last;
cl = cl->next;
/* coalesce the neighbouring file hunks */
while (cl && (cl->hunk->type & NGX_HUNK_FILE)) {
if (file->file->fd != cl->hunk->file->fd
|| fprev != cl->hunk->file_pos)
{
break;
}
fsize += (size_t) (cl->hunk->file_last - cl->hunk->file_pos);
fprev = cl->hunk->file_last;
cl = cl->next;
}
}
/*
* the tail is the rest of the chain that exceeded
* a single sendfile() capability
*/
tail = cl;
if (fsize) {
#if (HAVE_SENDFILE64)
offset = file->file_pos;
#else
offset = (int32_t) file->file_pos;
#endif
rc = sendfile(c->fd, file->file->fd, &offset, fsize);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
ngx_log_error(NGX_LOG_INFO, c->log, err,
"sendfile() EAGAIN");
} else if (err == NGX_EINTR) {
eintr = 1;
ngx_log_error(NGX_LOG_INFO, c->log, err,
"sendfile() EINTR");
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err,
"sendfile() failed");
return NGX_CHAIN_ERROR;
}
}
sent = rc > 0 ? rc : 0;
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "sendfile: %d, @" OFF_T_FMT " %d:%d" _
rc _ file->file_pos _ sent _ fsize);
#endif
} else {
rc = writev(c->fd, header.elts, header.nelts);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN");
} else if (err == NGX_EINTR) {
eintr = 1;
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EINTR");
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err, "writev() failed");
return NGX_CHAIN_ERROR;
}
}
sent = rc > 0 ? rc : 0;
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "writev: %d" _ sent);
#endif
}
c->sent += sent;
for (cl = in; cl; cl = cl->next) {
if (ngx_hunk_special(cl->hunk)) {
continue;
}
if (sent == 0) {
break;
}
size = ngx_hunk_size(cl->hunk);
if (sent >= size) {
sent -= size;
if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
cl->hunk->pos = cl->hunk->last;
}
if (cl->hunk->type & NGX_HUNK_FILE) {
cl->hunk->file_pos = cl->hunk->file_last;
}
continue;
}
if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
cl->hunk->pos += sent;
}
if (cl->hunk->type & NGX_HUNK_FILE) {
cl->hunk->file_pos += sent;
}
break;
}
in = cl;
/* "tail == in" means that a single sendfile() is complete */
} while ((tail && tail == in) || eintr);
if (in) {
wev->ready = 0;
}
return in;
}
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