1 files changed, 65 insertions, 0 deletions
diff --git a/ghc/lib/cbits/system.lc b/ghc/lib/cbits/system.lc
new file mode 100644
index 0000000000..013f111ba6
--- /dev/null
+++ b/ghc/lib/cbits/system.lc
@@ -0,0 +1,65 @@
+%
+% (c) The GRASP/AQUA Project, Glasgow University, 1995
+%
+\subsection[system.lc]{system Runtime Support}
+
+\begin{code}
+
+#include "rtsdefs.h"
+#include "stgio.h"
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifdef HAVE_VFORK_H
+#include <vfork.h>
+#endif
+
+#ifdef HAVE_VFORK
+#define fork vfork
+#endif
+
+StgInt
+systemCmd(cmd)
+StgByteArray cmd;
+{
+    int pid;
+    int wstat;
+
+    switch(pid = fork()) {
+    case -1:
+	if (errno != EINTR) {
+	    cvtErrno();
+	    stdErrno();
+	    return -1;
+	}
+    case 0:
+	/* the child */
+	execl("/bin/sh", "sh", "-c", cmd, NULL);
+	_exit(127);
+    }
+
+    while (waitpid(pid, &wstat, 0) < 0) {
+	if (errno != EINTR) {
+	    cvtErrno();
+	    stdErrno();
+	    return -1;
+	}
+    }
+
+    if (WIFEXITED(wstat))
+	return WEXITSTATUS(wstat);
+    else if (WIFSIGNALED(wstat)) {
+	ghc_errtype = ERR_INTERRUPTED;
+	ghc_errstr = "system command interrupted";
+    }
+    else {
+	/* This should never happen */
+	ghc_errtype = ERR_OTHERERROR;
+	ghc_errstr = "internal error (process neither exited nor signalled)";
+    }
+    return -1;
+}
+
+\end{code}