1 files changed, 42 insertions, 0 deletions
diff --git a/libc/misc/popen.c b/libc/misc/popen.c
new file mode 100644
index 0000000..c848ca4
--- /dev/null
+++ b/libc/misc/popen.c
@@ -0,0 +1,42 @@
+
+#include <stdio.h>
+
+
+FILE * popen(command, rw)
+char * command;
+char * rw;
+{
+   int pipe_fd[2];
+   int pid, reading;
+
+   if( pipe(pipe_fd) < 0 ) return NULL;
+   reading = (rw[0] == 'r');
+
+   pid = vfork();
+   if( pid < 0 ) { close(pipe_fd[0]); close(pipe_fd[1]); return NULL; }
+   if( pid == 0 )
+   {
+      close(pipe_fd[!reading]);
+      close(reading);
+      if( pipe_fd[reading] != reading )
+      {
+	 dup2(pipe_fd[reading], reading);
+         close(pipe_fd[reading]);
+      }
+
+      execl("/bin/sh", "sh", "-c", command, (char*)0);
+      _exit(255);
+   }
+
+   close(pipe_fd[reading]);
+   return fdopen(pipe_fd[!reading], rw);
+}
+
+int pclose(fd)
+FILE *fd;
+{
+   int waitstat;
+   if( fclose(fd) != 0 ) return EOF;
+   wait(&waitstat);
+}
+