From: Simone Piccardi <piccardi@gnulinux.it>
Date: Sat, 18 Aug 2007 12:35:00 +0000 (+0000)
Subject: Versione (parzialmente) funzionante, ho il dubbio che come su Feisty a
X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=commitdiff_plain;h=fb1020bd2b32afc135baa00f2443bb0ceed3520a

Versione (parzialmente) funzionante, ho il dubbio che come su Feisty a
32 bit ci sia qualcosa ancora che non va anche sulla 64 bit (perlomeno
le syscall vanno, ma pare non prendere {{{SPLICE_F_NONBLOCK}}}.
---

diff --git a/sources/tee.c b/sources/tee.c
index 4c4a872..18f01a2 100644
--- a/sources/tee.c
+++ b/sources/tee.c
@@ -1,22 +1,62 @@
+/* tee.c
+ * 
+ * Copyright (C) 2007 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Program tee.c: 
+ * A sample program that duolicete stdin to stdout and a file
+ *
+ * Author: Simone Piccardi
+ * Aug. 2007
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
 #define _GNU_SOURCE
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <limits.h>
-
+#include <fcntl.h>       /* file control functions */
+#include <unistd.h>      /* unix standard library */
+#include <stdlib.h>      /* C standard library */
+#include <errno.h>       /* error definitions and routines */
+#include <stdio.h>       /* standard I/O library */
+#include <string.h>      /* C strings library */
+#include <sys/stat.h>    /* file characteristics constants and functions */
+#include <sys/types.h>   /* primitive system data types */
+#include <limits.h>      /* system limits constants, types and functions */
 
+#include "macros.h"
+/* 
+ * Function and globals definitions
+ */
+void usage(void);  /* Help printing routine */
+/*
+ * Main program
+ */
 int main(int argc, char *argv[])
 {
    /*
     * Variables definition
     */
     int i;
-    int size = 4096;
+    size_t size = 4096;
     int fd;
     int len, nwrite;
+    struct stat sb;
     /*
      * Input section: decode command line parameters 
      * Use getopt function
@@ -56,7 +96,27 @@ int main(int argc, char *argv[])
 	       strerror(errno));
         exit(EXIT_FAILURE);
     }
+
+
+    if (fstat(STDIN_FILENO, &sb) < 0) {
+	perror("stat");
+	exit(EXIT_FAILURE);
+    }
+    if (!S_ISFIFO(sb.st_mode)) {
+	fprintf(stderr, "stdin must be a pipe\n");
+	exit(EXIT_FAILURE);
+    }
+    if (fstat(STDOUT_FILENO, &sb) < 0) {
+	perror("stat");
+	exit(EXIT_FAILURE);
+    }
+    if (!S_ISFIFO(sb.st_mode)) {
+	fprintf(stderr, "stdout must be a pipe\n");
+	exit(EXIT_FAILURE);
+    }
+
     /* tee loop */
+    //debug("Size %d\n", size);
     while (1) {
         /* copy stdin to stdout */
         len = tee(STDIN_FILENO, STDOUT_FILENO, size, SPLICE_F_NONBLOCK);
@@ -70,6 +130,7 @@ int main(int argc, char *argv[])
         } else {
             if (len == 0) break;
 	}
+	fprintf(stderr, "Copied %d byte\n", len);
         /* write data to the file using splice */
         while (len > 0) {
             nwrite = splice(STDIN_FILENO, NULL, fd, NULL, len, SPLICE_F_MOVE);
@@ -83,3 +144,16 @@ int main(int argc, char *argv[])
     close(fd);
     exit(EXIT_SUCCESS);
 }
+
+/*
+ * routine to print usage info and exit 
+ */
+void usage(void) {
+    printf("Program tee: duplicate stdin to stdout and a file\n");
+    printf("Usage:\n");
+    printf("  splicecp [-h] [-s N] filename\n");
+    printf("  -h           print this help\n");
+    printf("  -s N         set a buffer size of N bytes \n");
+    exit(1);
+}
+