programs to truncate a file based on path as well as fd.

Can be enhanced to write some truncate based application.

2 files changed, 56 insertions, 0 deletions

diff --git a/c_pgms/truncate/fd_truncate.c b/c_pgms/truncate/fd_truncate.c
new file mode 100644
index 0000000..1425ed0
--- /dev/null
+++ b/c_pgms/truncate/fd_truncate.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <fcntl.h>
+
+int main ()
+{
+        int     ret = -1;
+        int     fd  = -1;
+        char   *str = "This is a string";
+        char    pwd[255] = {0, };
+
+        fd = open ("test_file", O_RDWR);
+        if (fd == -1) {
+                       fprintf (stderr, "ERROR: open failed on the file test_file (%s)",
+                        strerror (errno));
+        }
+        ret = ftruncate (fd, 10);
+        if (ret == -1) {
+                fprintf (stderr, "ERROR: truncate failed on the file %s (%s)",
+                         pwd, strerror (errno));
+        }
+
+        if (fd > 0)
+                close (fd);
+}
diff --git a/c_pgms/truncate/truncate_file.c b/c_pgms/truncate/truncate_file.c
new file mode 100644
index 0000000..d6f0b60
--- /dev/null
+++ b/c_pgms/truncate/truncate_file.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <fcntl.h>
+
+int main ()
+{
+        int     ret = -1;
+        int     fd  = -1;
+        char   *str = "This is a string";
+        char    pwd[255] = {0, };
+
+        getcwd (pwd, sizeof (pwd));
+
+        strcat (pwd, "/test_file");
+
+        ret = truncate (pwd, 10);
+        if (ret == -1) {
+                fprintf (stderr, "ERROR: truncate failed on the file %s (%s)",
+                         pwd, strerror (errno));
+        }
+}