* perthread.h (vfork_save): Add ctty, sid, pgid, exitval fields.

(vfork_save::restore_pid): New method.
(vfork_save::restore_exit): New method.
* fork.cc (vfork): Save ctty, sid, pgid and restore them when returning to
"parent".  Use exitval field if exiting but never created a new process.
* syscalls.cc (setsid): Detect when in "vfork" and force an actual fork so that
pid will be allocated (UGLY!).
(getsid): New function.
* dcrt0.cc (do_exit): Use vfork_save::restore_exit method for returning from a
vfork.
* spawn.cc (spawnve): Use vfork_save::{restore_pid,restore_exit} methods for
returning from vfork.
* cygwin.din: Export getsid.
* include/cygwin/version.h: Bump api minor number.
* malloc.cc: #ifdef sYSTRIm for when MORECORE_CANNOT_TRIM is true.

winsup/cygwin/ChangeLog

@@ -1,3 +1,23 @@
+2002-08-18  Christopher Faylor  <cgf@redhat.com>
+
+	* perthread.h (vfork_save): Add ctty, sid, pgid, exitval fields.
+	(vfork_save::restore_pid): New method.
+	(vfork_save::restore_exit): New method.
+	* fork.cc (vfork): Save ctty, sid, pgid and restore them when returning
+	to "parent".  Use exitval field if exiting but never created a new
+	process.
+	* syscalls.cc (setsid): Detect when in "vfork" and force an actual fork
+	so that pid will be allocated (UGLY!).
+	(getsid): New function.
+	* dcrt0.cc (do_exit): Use vfork_save::restore_exit method for returning
+	from a vfork.
+	* spawn.cc (spawnve): Use vfork_save::{restore_pid,restore_exit}
+	methods for returning from vfork.
+	* cygwin.din: Export getsid.
+	* include/cygwin/version.h: Bump api minor number.
+
+	* malloc.cc: #ifdef sYSTRIm for when MORECORE_CANNOT_TRIM is true.
+
 2002-08-18  Christopher Faylor  <cgf@redhat.com>
 
 	* cygmalloc.h (MORECORE_CANNOT_TRIM): Define.

winsup/cygwin/cygwin.din

@@ -394,6 +394,7 @@ getrusage
 _getrusage = getrusage
 gets
 _gets = gets
+getsid
 gettimeofday
 _gettimeofday = gettimeofday
 getuid

winsup/cygwin/dcrt0.cc

@@ -961,10 +961,7 @@ do_exit (int status)
 
   vfork_save *vf = vfork_storage.val ();
   if (vf != NULL && vf->pid < 0)
-    {
-      vf->pid = status < 0 ? status : -status;
-      longjmp (vf->j, 1);
-    }
+    vf->restore_exit (status);
 
   if (exit_state < ES_SIGNAL)
     {

winsup/cygwin/fork.cc

@@ -687,8 +687,7 @@ get_vfork_val ()
 }
 #endif
 
-extern "C"
-int
+extern "C" int
 vfork ()
 {
 #ifndef NEWVFORK
@@ -711,9 +710,11 @@ vfork ()
       for (pp = (char **)vf->frame, esp = vf->vfork_esp;
 	   esp <= vf->vfork_ebp + 2; pp++, esp++)
 	*pp = *esp;
+      vf->ctty = myself->ctty;
+      vf->sid = myself->sid;
+      vf->pgid = myself->pgid;
       int res = cygheap->fdtab.vfork_child_dup () ? 0 : -1;
       debug_printf ("%d = vfork()", res);
-      debug_printf ("exiting vfork, res %d", res);
       return res;
     }
 
@@ -726,9 +727,13 @@ vfork ()
   thisframe.init (mainthread);
   cygheap->fdtab.vfork_parent_restore ();
 
+  myself->ctty = vf->ctty;
+  myself->sid = vf->sid;
+  myself->pgid = vf->pgid;
+
   if (vf->pid < 0)
     {
-      int exitval = -vf->pid;
+      int exitval = vf->exitval;
       vf->pid = 0;
       if ((vf->pid = fork ()) == 0)
 	exit (exitval);

winsup/cygwin/include/cygwin/version.h

@@ -157,12 +157,13 @@ details. */
        57: Export setgroups.
        58: Export memalign, valloc, malloc_trim, malloc_usable_size, mallopt,
            malloc_stats
+       59: getsid
      */
 
      /* Note that we forgot to bump the api for ualarm, strtoll, strtoull */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 58
+#define CYGWIN_VERSION_API_MINOR 59
 
      /* There is also a compatibity version number associated with the
 	shared memory regions.  It is incremented when incompatible

winsup/cygwin/malloc.cc

@@ -3294,7 +3294,7 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av;
 
 
 
-
+#ifndef MORECORE_CANNOT_TRIM
 /*
   sYSTRIm is an inverse of sorts to sYSMALLOc.  It gives memory back
   to the system (via negative arguments to sbrk) if there is unused
@@ -3360,6 +3360,7 @@ static int sYSTRIm(pad, av) size_t pad; mstate av;
   }
   return 0;
 }
+#endif /*MORECORE_CANNOT_TRIM*/
 
 /*
   ------------------------------ malloc ------------------------------

winsup/cygwin/perthread.h

@@ -48,14 +48,30 @@ public:
 };
 
 #if defined (NEED_VFORK)
-struct vfork_save
+class vfork_save
 {
-  int pid;
   jmp_buf j;
+  int exitval;
+ public:
+  int pid;
   DWORD frame[100];
   char **vfork_ebp;
   char **vfork_esp;
+  int ctty;
+  pid_t sid;
+  pid_t pgid;
   int is_active () { return pid < 0; }
+  void restore_pid (int val)
+  {
+    pid = val;
+    longjmp (j, 1);
+  }
+  void restore_exit (int val)
+  {
+    exitval = val;
+    longjmp (j, 1);
+  }
+  friend int vfork ();
 };
 
 class per_thread_vfork : public per_thread

winsup/cygwin/spawn.cc

@@ -907,11 +907,13 @@ spawnve (int mode, const char *path, const char *const *argv,
     case _P_DETACH:
       subproc_init ();
       ret = spawn_guts (path, argv, envp, mode);
-      if (vf && ret > 0)
+      if (vf)
 	{
 	  debug_printf ("longjmping due to vfork");
-	  vf->pid = ret;
-	  longjmp (vf->j, 1);
+	  if (ret < 0)
+	    vf->restore_exit (ret);
+	  else
+	    vf->restore_pid (ret);
 	}
       break;
     default:

winsup/cygwin/syscalls.cc

@@ -36,6 +36,9 @@ details. */
 #include <unistd.h>
 #include "shared_info.h"
 #include "cygheap.h"
+#define NEED_VFORK
+#include <setjmp.h>
+#include "perthread.h"
 
 SYSTEM_INFO system_info;
 
@@ -265,11 +268,24 @@ getppid ()
 extern "C" pid_t
 setsid (void)
 {
-  if (myself->pgid != _getpid ())
+  vfork_save *vf = vfork_storage.val ();
+  /* This is a horrible, horrible kludge */
+  if (vf && vf->pid < 0)
     {
-      if (myself->ctty == TTY_CONSOLE &&
-	  !cygheap->fdtab.has_console_fds () &&
-	  !check_pty_fds ())
+      pid_t pid = fork ();
+      if (pid > 0)
+	{
+	  syscall_printf ("longjmping due to vfork");
+	  vf->restore_pid (pid);
+	}
+      /* assuming that fork was successful */
+    }
+
+  if (myself->pgid != myself->pid)
+    {
+      if (myself->ctty == TTY_CONSOLE
+	  && !cygheap->fdtab.has_console_fds ()
+	  && !check_pty_fds ())
 	FreeConsole ();
       myself->ctty = -1;
       myself->sid = _getpid ();
@@ -277,10 +293,31 @@ setsid (void)
       syscall_printf ("sid %d, pgid %d, ctty %d", myself->sid, myself->pgid, myself->ctty);
       return myself->sid;
     }
+
   set_errno (EPERM);
   return -1;
 }
 
+extern "C" pid_t
+getsid (pid_t pid)
+{
+  pid_t res;
+  if (!pid)
+    res = myself->sid;
+  else
+    {
+      pinfo p (pid);
+      if (p)
+	res = p->sid;
+      else
+	{
+	  set_errno (ESRCH);
+	  res = -1;
+	}
+    }
+  return res;
+}
+
 extern "C" ssize_t
 _read (int fd, void *ptr, size_t len)
 {