Mercurial > hg > nginx-quic
diff src/os/unix/ngx_writev_chain.c @ 93:738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 21 May 2003 13:28:21 +0000 |
parents | |
children | 8220378432a8 |
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new file mode 100644 --- /dev/null +++ b/src/os/unix/ngx_writev_chain.c @@ -0,0 +1,93 @@ + +#include <ngx_config.h> +#include <ngx_core.h> + + +ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in) +{ + char *prev; + size_t size; + ssize_t n; + off_t sent; + struct iovec *iov; + ngx_err_t err; + ngx_array_t io; + ngx_chain_t *ce; + + ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_CHAIN_ERROR); + + prev = NULL; + iov = NULL; + + /* create the iovec and coalesce the neighbouring chain entries */ + for (ce = in; ce; ce = ce->next) { + + if (prev == ce->hunk->pos) { + iov->iov_len += ce->hunk->last - ce->hunk->pos; + prev = ce->hunk->last; + + } else { + ngx_test_null(iov, ngx_push_array(&io), NGX_CHAIN_ERROR); + iov->iov_base = ce->hunk->pos; + iov->iov_len = ce->hunk->last - ce->hunk->pos; + prev = ce->hunk->last; + } + } + + n = writev(c->fd, (struct iovec *) io.elts, io.nelts); + + if (n == -1) { + err = ngx_errno; + if (err == NGX_EAGAIN) { + ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN"); + + } else if (err == NGX_EINTR) { + 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 = n > 0 ? n : 0; + +#if (NGX_DEBUG_WRITE_CHAIN) + ngx_log_debug(c->log, "writev: %qd" _ sent); +#endif + + c->sent += sent; + + for (ce = in; ce && sent > 0; ce = ce->next) { + + size = ce->hunk->last - ce->hunk->pos; + + if (sent >= size) { + sent -= size; + + if (ce->hunk->type & NGX_HUNK_IN_MEMORY) { + ce->hunk->pos = ce->hunk->last; + } + + if (ce->hunk->type & NGX_HUNK_FILE) { + ce->hunk->file_pos = ce->hunk->file_last; + } + + continue; + } + + if (ce->hunk->type & NGX_HUNK_IN_MEMORY) { + ce->hunk->pos += sent; + } + + if (ce->hunk->type & NGX_HUNK_FILE) { + ce->hunk->file_pos += sent; + } + + break; + } + + ngx_destroy_array(&io); + + return ce; +}