#include #include #include ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in) { char *prev; ssize_t n, size; off_t sent; struct iovec *iov; ngx_int_t eintr; ngx_err_t err; ngx_array_t io; ngx_chain_t *cl; ngx_event_t *wev; wev = c->write; if (!wev->ready) { return in; } #if (HAVE_KQUEUE) if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && wev->kq_eof) { ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno, "kevent() reported about an closed connection"); wev->error = 1; return NGX_CHAIN_ERROR; } #endif ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_CHAIN_ERROR); do { prev = NULL; iov = NULL; eintr = 0; /* create the iovec and coalesce the neighbouring hunks */ for (cl = in; cl; cl = cl->next) { if (prev == cl->hunk->pos) { iov->iov_len += cl->hunk->last - cl->hunk->pos; prev = cl->hunk->last; } else { ngx_test_null(iov, ngx_push_array(&io), NGX_CHAIN_ERROR); iov->iov_base = cl->hunk->pos; iov->iov_len = cl->hunk->last - cl->hunk->pos; prev = cl->hunk->last; } } n = writev(c->fd, io.elts, io.nelts); if (n == -1) { err = ngx_errno; if (err == NGX_EAGAIN || err == NGX_EINTR) { if (err == NGX_EINTR) { eintr = 1; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "writev() not ready"); } else { wev->error = 1; ngx_connection_error(c, err, "writev() failed"); return NGX_CHAIN_ERROR; } } sent = n > 0 ? n : 0; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: " OFF_T_FMT, sent); c->sent += sent; for (cl = in; cl && sent > 0; cl = cl->next) { size = cl->hunk->last - cl->hunk->pos; if (sent >= size) { sent -= size; if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { cl->hunk->pos = cl->hunk->last; } continue; } if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { cl->hunk->pos += sent; } break; } } while (eintr); if (cl) { wev->ready = 0; } return cl; }