# HG changeset patch
# User jwe
# Date 887342897 0
# Node ID 94fc53d8256106374c8fa6a4d41fbd8e40201437
# Parent  a34a56e2e5673e17c78e98b0c932d50bfdd29a4d
[project @ 1998-02-13 04:08:17 by jwe]

diff --git a/src/ChangeLog b/src/ChangeLog
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb 12 22:07:00 1998  John W. Eaton  <jwe@bevo.che.wisc.edu>
+
+	* system.c: New file.
+	* Makefile.in (SOURCES): Add it to the list.
+
 Fri Feb  6 01:23:18 1998  John W. Eaton  <jwe@bevo.che.wisc.edu>
 
 	* oct-stream.cc (octave_base_stream::file_number): Rename from fileno.
diff --git a/src/Makefile.in b/src/Makefile.in
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -124,7 +124,7 @@
 	oct-procbuf.cc oct-stdstrm.cc oct-stream.cc oct-strstrm.cc \
 	oct-lvalue.cc pager.cc parse.y pr-output.cc procstream.cc \
 	sighandlers.cc strcasecmp.c strncase.c strfns.cc \
-	strftime.c symtab.cc syscalls.cc sysdep.cc token.cc \
+	strftime.c symtab.cc syscalls.cc sysdep.cc system.c token.cc \
 	toplev.cc unwind-prot.cc utils.cc variables.cc xdiv.cc \
 	xpow.cc $(OV_SRC) $(PT_SRC)
 
diff --git a/src/system.c b/src/system.c
new file mode 100644
--- /dev/null
+++ b/src/system.c
@@ -0,0 +1,94 @@
+#if defined (__CYGWIN32__)
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int
+system (const char *cmd)
+{
+  pid_t pid;
+
+  int status = 1;
+
+  struct sigaction ignore, saved_sigint, saved_sigquit;
+
+  sigset_t child_mask, saved_mask;
+
+  if (cmd)
+    {
+      ignore.sa_handler = SIG_IGN;
+
+      sigemptyset (&ignore.sa_mask);
+
+      ignore.sa_flags = 0;
+
+      if (sigaction (SIGINT, &ignore, &saved_sigint) < 0)
+	return -1;
+
+      if (sigaction (SIGQUIT, &ignore, &saved_sigquit) < 0)
+	return -1;
+
+      sigemptyset (&child_mask);
+
+      sigaddset (&child_mask, SIGCHLD);
+
+      if (sigprocmask (SIG_BLOCK, &child_mask, &saved_mask) < 0)
+	return -1;
+
+      if ((pid = fork ()) < 0)
+	status = -1;
+      else if (pid == 0)
+	{
+	  sigaction (SIGINT, &saved_sigint, 0);
+	  sigaction (SIGQUIT, &saved_sigquit, 0);
+
+	  sigprocmask (SIG_SETMASK, &saved_mask, 0);
+
+	  execl ("/bin/sh", "sh", "-c", cmd, 0);
+
+	  exit (127);
+	}
+      else
+	{
+	  while (waitpid (pid, &status, 0) < 0)
+	    {
+	      if (errno != EINTR)
+		{
+		  status = -1;
+		  break;
+		}
+	    }
+	}
+
+      if (sigaction (SIGINT, &saved_sigint, 0) < 0)
+	return -1;
+
+      if (sigaction (SIGQUIT, &saved_sigquit, 0) < 0)
+	return -1;
+
+      if (sigprocmask (SIG_SETMASK, &saved_mask, 0) < 0)
+	return -1;      
+    }
+
+  return status;
+}
+
+#if defined (TEST)
+int
+main (void)
+{
+  system ("info");
+  while (1)
+    {
+      printf ("foo-i-hithere\n");
+      sleep (1);
+    }
+  return 0;
+}
+#endif
+
+#endif