Test and fix primary-read

2020-02-09 19:17:32 +03:00
parent 235d15422c
commit 97d3fc593c
10 changed files with 297 additions and 19 deletions
@@ -0,0 +1,52 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "rw_blocking.h"
+
+int read_blocking(int fd, void *read_buf, size_t remaining)
+{
+    size_t done = 0;
+    while (done < remaining)
+    {
+        size_t r = read(fd, read_buf, remaining-done);
+        if (r <= 0)
+        {
+            if (!errno)
+            {
+                // EOF
+                return done;
+            }
+            else if (errno != EAGAIN && errno != EPIPE)
+            {
+                perror("read");
+                exit(1);
+            }
+            continue;
+        }
+        done += r;
+        read_buf += r;
+    }
+    return done;
+}
+
+int write_blocking(int fd, void *write_buf, size_t remaining)
+{
+    size_t done = 0;
+    while (done < remaining)
+    {
+        size_t r = write(fd, write_buf, remaining-done);
+        if (r < 0)
+        {
+            if (errno != EAGAIN && errno != EPIPE)
+            {
+                perror("write");
+                exit(1);
+            }
+            continue;
+        }
+        done += r;
+        write_buf += r;
+    }
+    return done;
+}