simplify osx_write_pre_select()
[paraslash.git] / dccp_send.c
index 57e2a70..bb46678 100644 (file)
@@ -16,6 +16,8 @@
  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  */
 
+/** \file dccp_send.c paraslash's dccp sender */
+
 /*
  * based on server.c of dccp-cs-0.01.tar.bz2,
  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
 #include "dccp.h"
 #include "error.h"
 #include "string.h"
+#include "fd.h"
+#include "close_on_fork.h"
 #include "server.cmdline.h"
-extern struct gengetopt_args_info conf;
+
 /** the list of connected clients **/
 static struct list_head clients;
 static int listen_fd = -1;
@@ -44,20 +48,20 @@ struct dccp_client {
        struct sockaddr_in addr;
        /** the position of this client in the client list */
        struct list_head node;
-       int header_sent; /* non-zero if audio file header has been sent */
+       /** non-zero if audio file header has been sent */
+       int header_sent;
 };
 
-static void dccp_pre_select(__unused struct audio_format *af, int *max_fileno, fd_set *rfds,
-               __unused fd_set *wfds)
+static void dccp_pre_select( int *max_fileno, fd_set *rfds,
+               __a_unused fd_set *wfds)
 {
        if (listen_fd < 0)
                return;
        FD_SET(listen_fd, rfds);
-       *max_fileno = MAX(*max_fileno, listen_fd);
+       *max_fileno = PARA_MAX(*max_fileno, listen_fd);
 }
 
-static void dccp_post_select(__unused struct audio_format *af, fd_set *rfds,
-               __unused fd_set *wfds)
+static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 {
        struct dccp_client *dc;
        int ret;
@@ -73,6 +77,8 @@ static void dccp_post_select(__unused struct audio_format *af, fd_set *rfds,
        PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
        dc->fd = ret;
        list_add(&dc->node, &clients);
+       add_close_on_fork_list(dc->fd);
+       mark_fd_nonblock(dc->fd);
 }
 
 static int dccp_open(void)
@@ -99,19 +105,49 @@ static int dccp_open(void)
        if (ret < 0)
                return -E_DCCP_LISTEN;
        PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
+       add_close_on_fork_list(listen_fd);
+       mark_fd_nonblock(listen_fd);
        return 1;
 }
 
 static void dccp_shutdown_client(struct dccp_client *dc)
 {
+       PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
+               dc->fd);
        close(dc->fd);
+       del_close_on_fork_list(dc->fd);
        list_del(&dc->node);
        free(dc);
 }
 
-static void dccp_send(__unused struct audio_format *af,
-               long unsigned current_chunk,
-               __unused long unsigned chunks_sent, const char *buf, size_t len)
+#define DCCP_RETRIES 100
+
+static int dccp_write(int fd, const char *buf, size_t len)
+{
+       size_t size, written = 0;
+       int ret, retries = 0;
+again:
+       size = PARA_MIN(1024, len - written);
+       ret = write(fd, buf + written, size);
+       if (ret < 0) {
+               if (errno != EAGAIN || !retries++ > DCCP_RETRIES)
+                       goto err_out;
+               PARA_DEBUG_LOG("EAGAIN #%d@%zd/%zd\n", retries, written, len);
+               goto again;
+       }
+       retries = 0;
+       written += ret;
+       if (written >= len)
+               return written;
+       ret = write_ok(fd);
+       if (ret > 0)
+               goto again;
+err_out:
+       return -E_DCCP_WRITE;
+}
+
+static void dccp_send(long unsigned current_chunk,
+               __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 {
        struct dccp_client *dc, *tmp;
        int ret, header_len;
@@ -128,29 +164,30 @@ static void dccp_send(__unused struct audio_format *af,
                }
                if (!ret)
                        continue;
-               if (!dc->header_sent && af->get_header_info && current_chunk) {
-                       header_buf = af->get_header_info(&header_len);
-                       if (!header_buf || header_len <= 0)
-                               continue; /* header not yet available */
-                       ret = write(dc->fd, header_buf, header_len);
-                       if (ret != header_len) {
-                               int err = errno;
-                               PARA_ERROR_LOG("header write: %d/%d (%s)\n",
-                                       ret, header_len, ret < 0?
-                                       strerror(err) : "");
-                               dccp_shutdown_client(dc);
-                               continue;
-                       }
-                       ret = write_ok(dc->fd);
-                       if (ret < 0) {
-                               dccp_shutdown_client(dc);
-                               continue;
+               if (!dc->header_sent && current_chunk) {
+                       header_buf = afs_get_header(&header_len);
+                       if (header_buf && header_len > 0) {
+                               ret = dccp_write(dc->fd, header_buf, header_len);
+                               if (ret != header_len) {
+                                       int err = errno;
+                                       PARA_ERROR_LOG("header write: %d/%d (%s)\n",
+                                               ret, header_len, ret < 0?
+                                               strerror(err) : "");
+                                       dccp_shutdown_client(dc);
+                                       continue;
+                               }
+                               dc->header_sent = 1;
+                               ret = write_ok(dc->fd);
+                               if (ret < 0) {
+                                       dccp_shutdown_client(dc);
+                                       continue;
+                               }
+                               if (!ret)
+                                       continue;
                        }
-                       if (!ret)
-                               continue;
                }
 //             PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
-               ret = write(dc->fd, buf, len);
+               ret = dccp_write(dc->fd, buf, len);
                if (ret != len)
                        dccp_shutdown_client(dc);
        }
@@ -182,6 +219,14 @@ static char *dccp_help(void)
        return make_message("no help available\n");
 }
 
+/**
+ * the init function of the dccp sender
+ *
+ * \param s pointer to the dccp sender struct
+ *
+ * It initializes all function pointers of \a s and starts
+ * listening on the given port.
+ */
 void dccp_send_init(struct sender *s)
 {
        int ret;
@@ -201,8 +246,9 @@ void dccp_send_init(struct sender *s)
        s->client_cmds[SENDER_DELETE] = NULL;
        self = s;
        ret = dccp_open();
-       if (ret < 0)
+       if (ret < 0) {
                PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
-       else
+               s->status = SENDER_OFF;
+       } else
                s->status = SENDER_ON;
 }