1 files changed, 59 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/redir.c b/reference/C/CONTRIB/SNIP/redir.c
new file mode 100755
index 0000000..5d04404
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/redir.c
@@ -0,0 +1,59 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+
+Program: REDIR.C
+Author:  F. PIETTE (2:293/2201.135)
+Object:  Demonstration of the output redirection
+Creation: Augustus 2, 1991
+Updates:
+
+
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+#include <stdio.h>
+#include <stdlib.h>
+#include <io.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+void main(void)
+{
+    int old_fh;
+    int new_fh;
+
+    fprintf(stdout, "This goes to the original standard output\n");
+
+    /* Duplicate the stdout file handle to restore it later */
+    old_fh = dup(fileno(stdout));
+    if (old_fh == -1) {
+         fprintf(stderr, "dup error\n");
+         exit(1);
+    }
+
+    /* Open the new file for output */
+    if ((new_fh = open("redir.txt", O_CREAT | O_TRUNC | O_WRONLY,
+                       S_IREAD | S_IWRITE)) == -1) {
+         fprintf(stderr, "Unable to open redir.txt\n");
+         exit(1);
+    }
+    /* Duplicate the new handle to stdout */
+    dup2(new_fh, fileno(stdout));
+    /* We don't need new_fh any more, so close it */
+    close(new_fh);
+
+    /* stdout is now redirected, let's try it */
+    fprintf(stdout, "This goes to redir.txt file !\n");
+
+    /* If you run a program using spawn(), the child program will have */
+    /* its output redirected to REDIR.TXT file ! */
+
+    /* Now let's restore stdout to its original state */
+    fflush(stdout);  /* First flush the outut buffer */
+    /* Then duplicate the original file handle to stdout */
+    dup2(old_fh, fileno(stdout));
+
+    /* Let's try if we canceled the redirection */
+    fprintf(stdout, "Back to original stdout\n");
+
+    exit(0);
+}