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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
/*
* sendfile() has been introduced in Linux 2.2.
* It supported 32-bit offsets only.
*
* Linux 2.4.21 has introduced sendfile64(). However, even on 64-bit
* platforms it returns EINVAL if the count argument is more than 2G-1 bytes.
* In Linux 2.6.17 sendfile() has been internally changed to splice()
* and this limitation has gone.
*/
#ifdef NXT_TEST_BUILD_LINUX_SENDFILE
#define MSG_NOSIGNAL 0x4000
#define MSG_MORE 0x8000
ssize_t nxt_linux_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
size_t limit);
static ssize_t nxt_sys_sendfile(int out_fd, int in_fd, off_t *offset,
size_t count)
{
return -1;
}
#else
#define nxt_sys_sendfile sendfile
#endif
static ssize_t nxt_linux_send(nxt_event_conn_t *c, void *buf, size_t size,
nxt_uint_t flags);
static ssize_t nxt_linux_sendmsg(nxt_event_conn_t *c,
nxt_sendbuf_coalesce_t *sb, nxt_uint_t niov, nxt_uint_t flags);
ssize_t
nxt_linux_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
size_t limit)
{
size_t size;
ssize_t n;
nxt_buf_t *fb;
nxt_err_t err;
nxt_off_t offset;
nxt_uint_t niov, flags;
struct iovec iov[NXT_IOBUF_MAX];
nxt_sendbuf_coalesce_t sb;
sb.buf = b;
sb.iobuf = iov;
sb.nmax = NXT_IOBUF_MAX;
sb.sync = 0;
sb.size = 0;
sb.limit = limit;
niov = nxt_sendbuf_mem_coalesce(c->socket.task, &sb);
if (niov == 0 && sb.sync) {
return 0;
}
fb = (sb.buf != NULL && nxt_buf_is_file(sb.buf)) ? sb.buf : NULL;
if (niov != 0) {
flags = MSG_NOSIGNAL;
if (fb != NULL) {
/*
* The Linux-specific MSG_MORE flag is cheaper
* than additional setsockopt(TCP_CORK) syscall.
*/
flags |= MSG_MORE;
}
if (niov == 1) {
/*
* Disposal of surplus kernel msghdr
* and iovec copy-in operations.
*/
return nxt_linux_send(c, iov->iov_base, iov->iov_len, flags);
}
return nxt_linux_sendmsg(c, &sb, niov, flags);
}
size = nxt_sendbuf_file_coalesce(&sb);
nxt_debug(c->socket.task, "sendfile(%d, %FD, @%O, %uz)",
c->socket.fd, fb->file->fd, fb->file_pos, size);
offset = fb->file_pos;
n = nxt_sys_sendfile(c->socket.fd, fb->file->fd, &offset, size);
err = (n == -1) ? nxt_errno : 0;
nxt_debug(c->socket.task, "sendfile(): %z", n);
if (n == -1) {
switch (err) {
case NXT_EAGAIN:
c->socket.write_ready = 0;
break;
case NXT_EINTR:
break;
default:
c->socket.error = err;
nxt_log(c->socket.task, nxt_socket_error_level(err),
"sendfile(%d, %FD, %O, %uz) failed %E \"%FN\"",
c->socket.fd, fb->file->fd, fb->file_pos, size,
err, fb->file->name);
return NXT_ERROR;
}
nxt_debug(c->socket.task, "sendfile() %E", err);
return 0;
}
if (n < (ssize_t) size) {
c->socket.write_ready = 0;
}
return n;
}
static ssize_t
nxt_linux_send(nxt_event_conn_t *c, void *buf, size_t size, nxt_uint_t flags)
{
ssize_t n;
nxt_err_t err;
n = send(c->socket.fd, buf, size, flags);
err = (n == -1) ? nxt_errno : 0;
nxt_debug(c->socket.task, "send(%d, %p, %uz, 0x%uXi): %z",
c->socket.fd, buf, size, flags, n);
if (n == -1) {
switch (err) {
case NXT_EAGAIN:
c->socket.write_ready = 0;
break;
case NXT_EINTR:
break;
default:
c->socket.error = err;
nxt_log(c->socket.task, nxt_socket_error_level(err),
"send(%d, %p, %uz, 0x%uXi) failed %E",
c->socket.fd, buf, size, flags, err);
return NXT_ERROR;
}
nxt_debug(c->socket.task, "send() %E", err);
return 0;
}
if (n < (ssize_t) size) {
c->socket.write_ready = 0;
}
return n;
}
static ssize_t
nxt_linux_sendmsg(nxt_event_conn_t *c, nxt_sendbuf_coalesce_t *sb,
nxt_uint_t niov, nxt_uint_t flags)
{
ssize_t n;
nxt_err_t err;
struct msghdr msg;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = sb->iobuf;
msg.msg_iovlen = niov;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
n = sendmsg(c->socket.fd, &msg, flags);
err = (n == -1) ? nxt_errno : 0;
nxt_debug(c->socket.task, "sendmsg(%d, %ui, 0x%uXi): %z",
c->socket.fd, niov, flags, n);
if (n == -1) {
switch (err) {
case NXT_EAGAIN:
c->socket.write_ready = 0;
break;
case NXT_EINTR:
break;
default:
c->socket.error = err;
nxt_log(c->socket.task, nxt_socket_error_level(err),
"sendmsg(%d, %ui, 0x%uXi) failed %E",
c->socket.fd, niov, flags, err);
return NXT_ERROR;
}
nxt_debug(c->socket.task, "sendmsg() %E", err);
return 0;
}
if (n < (ssize_t) sb->size) {
c->socket.write_ready = 0;
}
return n;
}
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