Doxify error2.c and add GPL header.

[paraslash.git] / stdout.c

diff --git a/stdout.c b/stdout.c
index 33770c46d36e0ea772a84abbdda9babb9f271fc3..cf33bf6d0b67cf49625d27b4d602dec35922d32d 100644 (file)
--- a/stdout.c
+++ b/stdout.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2013 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -30,7 +30,6 @@ static void stdout_pre_select(struct sched *s, struct task *t)
        struct stdout_task *sot = container_of(t, struct stdout_task, task);
        int ret;
 
-       t->error = 0;
        ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
        if (ret > 0)
                para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
@@ -47,7 +46,7 @@ static void stdout_pre_select(struct sched *s, struct task *t)
  * This function writes input data from the buffer tree to stdout if \p
  * STDOUT_FILENO is writable.
  */
-static void stdout_post_select(struct sched *s, struct task *t)
+static int stdout_post_select(struct sched *s, struct task *t)
 {
        struct stdout_task *sot = container_of(t, struct stdout_task, task);
        struct btr_node *btrn = sot->btrn;
@@ -55,28 +54,36 @@ static void stdout_post_select(struct sched *s, struct task *t)
        char *buf;
        size_t sz;
 
-       t->error = 0;
        ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
        if (ret < 0)
                goto out;
        if (ret == 0)
-               return;
+               return 0;
        if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
-               return;
+               return 0;
 
+       if (sot->must_set_nonblock_flag) {
+               ret = mark_fd_nonblocking(STDOUT_FILENO);
+               if (ret < 0)
+                       goto out;
+               sot->must_set_nonblock_flag = false;
+       }
        for (;;) {
                sz = btr_next_buffer(btrn, &buf);
                if (sz == 0)
                        break;
-               ret = write_nonblock(STDOUT_FILENO, buf, sz);
+               ret = xwrite(STDOUT_FILENO, buf, sz);
                if (ret <= 0)
                        break;
                btr_consume(btrn, ret);
        }
 out:
-       if (ret < 0)
-               btr_remove_node(btrn);
-       t->error = ret;
+       if (ret < 0) {
+               btr_remove_node(&sot->btrn);
+               /* Revert to blocking mode if necessary. */
+               fcntl(STDOUT_FILENO, F_SETFL, sot->fd_flags);
+       }
+       return ret;
 }
 /**
  * Initialize a stdout task structure with default values.
@@ -84,7 +91,7 @@ out:
  * \param sot The stdout task structure.
  *
  * This fills in the pre/post select function pointers of the task structure
- * given by \a sot and sets the stdout file descriptor to nonblocking mode.
+ * given by \a sot.
  */
 void stdout_set_defaults(struct stdout_task *sot)
 {
@@ -93,9 +100,13 @@ void stdout_set_defaults(struct stdout_task *sot)
        sot->task.pre_select = stdout_pre_select;
        sot->task.post_select = stdout_post_select;
        sprintf(sot->task.status, "stdout");
-       ret = mark_fd_nonblocking(STDOUT_FILENO);
-       if (ret >= 0)
-               return;
-       PARA_EMERG_LOG("%s\n", para_strerror(-ret));
-       exit(EXIT_FAILURE);
+
+       /* See stdin.c for details. */
+       ret = fcntl(STDOUT_FILENO, F_GETFL);
+       if (ret < 0) {
+               PARA_EMERG_LOG("F_GETFL: %s\n", strerror(errno));
+               exit(EXIT_FAILURE);
+       }
+       sot->fd_flags = ret;
+       sot->must_set_nonblock_flag = (sot->fd_flags & O_NONBLOCK) == 0;
 }