stdout.c

   1 #include "para.h"
   2 #include "string.h"
   3 #include "list.h"
   4 #include "sched.h"
   5 #include "fd.h"
   6 #include "error.h"
   7 #include "stdout.h"
   8
   9 void stdout_pre_select(struct sched *s, struct task *t)
  10 {
  11         struct stdout_task *sot = t->private_data;
  12
  13         t->ret = 1;
  14         sot->check_fd = 0;
  15         if (!*sot->loaded) {
  16                 if (*sot->input_eof) {
  17                         t->ret = -E_STDOUT_EOF;
  18                         s->timeout.tv_sec = 0;
  19                         s->timeout.tv_usec = 1;
  20                 }
  21                 return;
  22         }
  23         sot->check_fd = 1;
  24         para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
  25 }
  26
  27 void stdout_post_select(struct sched *s, struct task *t)
  28 {
  29         struct stdout_task *sot = t->private_data;
  30         ssize_t ret;
  31
  32         t->ret = 1;
  33         if (!sot->check_fd) {
  34                 if (*sot->input_eof)
  35                         t->ret = -E_STDOUT_EOF;
  36                 return;
  37         }
  38         if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
  39                 return;
  40         t->ret = -E_STDOUT_WRITE;
  41         ret = write(STDOUT_FILENO, sot->buf, *sot->loaded);
  42         if (ret <= 0)
  43                 return;
  44         *sot->loaded -= ret;
  45         t->ret = 1;
  46 }
  47
  48 void stdout_default_event_handler(struct task *t)
  49 {
  50         PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
  51         unregister_task(t);
  52 }
  53
  54
  55 void stdout_set_defaults(struct stdout_task *sot)
  56 {
  57         sot->task.private_data = sot;
  58         sot->task.pre_select = stdout_pre_select;
  59         sot->task.post_select = stdout_post_select;
  60         sot->task.event_handler = stdout_default_event_handler;
  61         sot->eof = 0;
  62         sprintf(sot->task.status, "stdout writer");
  63 }