1 files changed, 49 insertions, 0 deletions
diff --git a/libc/misc/system.c b/libc/misc/system.c
new file mode 100644
index 0000000..f48f68d
--- /dev/null
+++ b/libc/misc/system.c
@@ -0,0 +1,49 @@
+
+#include <stddef.h>
+#include <signal.h>
+
+int
+system(command)
+char * command;
+{
+   int wait_val, wait_ret, pid;
+   __sighandler_t save_quit;
+   __sighandler_t save_int;
+
+   if( command == 0 ) return 1;
+
+   save_quit = signal(SIGQUIT, SIG_IGN);
+   save_int  = signal(SIGINT,  SIG_IGN);
+
+   if( (pid=vfork()) < 0 )
+   {
+      signal(SIGQUIT, save_quit);
+      signal(SIGINT,  save_int);
+      return -1;
+   }
+   if( pid == 0 )
+   {
+      signal(SIGQUIT, SIG_DFL);
+      signal(SIGINT,  SIG_DFL);
+
+      execl("/bin/sh", "sh", "-c", command, (char*)0);
+      _exit(127);
+   }
+   /* Signals are not absolutly guarenteed with vfork */
+   signal(SIGQUIT, SIG_IGN);
+   signal(SIGINT,  SIG_IGN);
+
+   do
+   {
+      if( (wait_ret = wait(&wait_val)) == -1 )
+      {
+         wait_val = -1;
+	 break;
+      }
+   }
+   while( wait_ret != pid );
+
+   signal(SIGQUIT, save_quit);
+   signal(SIGINT,  save_int);
+   return wait_val;
+}