Update 'Kanzlei-Kiel'.

Kanzlei-Kiel/src/djbdns/qlogtools-3.1/teepipe.c

@@ -0,0 +1,93 @@
+/* teepipe -- tee output to both stdout and a program
+ * Copyright (C) 2000 Bruce Guenter <bruceg@em.ca>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include "fork.h"
+
+void err(const char* msg)
+{
+  write(2, "teepipe: Error: ", 16);
+  write(2, msg, strlen(msg));
+  write(2, "\n", 1);
+  exit(1);
+}
+
+void err2(const char* msg1, const char* msg2)
+{
+  write(2, "teepipe: Error: ", 16);
+  write(2, msg1, strlen(msg1));
+  write(2, msg2, strlen(msg2));
+  write(2, "\n", 1);
+  exit(1);
+}
+
+#define BUFSIZE 4096
+
+void main_loop(int fd)
+{
+  for(;;) {
+    char buf[BUFSIZE];
+    ssize_t rd = read(0, buf, BUFSIZE);
+    if(rd == 0 || rd == -1)
+      break;
+    if(write(fd, buf, rd) != rd)
+      err("Error writing to program");
+    if(write(1, buf, rd) != rd)
+      err("Error writing to standard output");
+  }
+}
+
+void exec_child(char** argv, int fd[2])
+{
+  if(close(fd[1]) || close(0) ||
+     dup2(fd[0], 0) || close(fd[0]))
+    err("Error setting up pipe as standard input");
+  if(close(1) || dup2(2, 1) != 1)
+    err("Error setting up standard output");
+  execvp(argv[0], argv);
+  err2("Error executing", argv[0]);
+}
+  
+int main(int argc, char** argv)
+{
+  int fd[2];
+  int status;
+  pid_t pid;
+  if(argc < 2)
+    err("usage: teepipe program [args ...]");
+  if(pipe(fd) == -1)
+    err("Could not create pipe");
+  pid = fork();
+  if(pid == -1)
+    err("Could not fork");
+  if(!pid)
+    exec_child(argv+1, fd);
+  signal(SIGPIPE, SIG_IGN);
+  signal(SIGCHLD, SIG_IGN);
+  close(fd[0]);
+  main_loop(fd[1]);
+  if(close(fd[1]))
+    err("Error closing output pipe");
+  if(waitpid(pid, &status, 0) != pid)
+    err("Error waiting for program to exit");
+  return WIFEXITED(status) ? WEXITSTATUS(status) : 255;
+}