[Assorted-commits] SF.net SVN: assorted: [664] sandbox/trunk/src/c/pwrite.c

[<yan...@us...>]

Revision: 664
          http://assorted.svn.sourceforge.net/assorted/?rev=664&view=rev
Author:   yangzhang
Date:     2008-04-19 20:27:10 -0700 (Sat, 19 Apr 2008)

Log Message:
-----------
added pwrite test

Added Paths:
-----------
    sandbox/trunk/src/c/pwrite.c

Added: sandbox/trunk/src/c/pwrite.c
===================================================================
--- sandbox/trunk/src/c/pwrite.c	                        (rev 0)
+++ sandbox/trunk/src/c/pwrite.c	2008-04-20 03:27:10 UTC (rev 664)
@@ -0,0 +1,30 @@
+// What does pwrite() do when offset is beyond EOF?
+// It simply appends to the EOF.
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int
+main()
+{
+  int fd = creat("/tmp/touchme", O_WRONLY);
+  if (fd < 0) {
+    perror("creat");
+    return -1;
+  }
+  char buf[] = "hello, world!";
+  // Notice the offset!
+  size_t count = sizeof buf, offset = 10;
+  if (pwrite(fd, buf, count, offset) < 0) {
+    perror("pwrite");
+    return -1;
+  }
+  if (close(fd) != 0) {
+    perror("close");
+    return -1;
+  }
+  return 0;
+}


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