From fda41e199093b41f026fb8c06e8e2cddcace4d83 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Sun, 18 Sep 2022 15:08:31 +0100
Subject: [PATCH] Add cmake check for whether setpgrp takes arguments.

FreeBSD declares setpgrp() as taking two arguments, like Linux's
setpgid(). Detect that at configure time and adjust the call in
Pageant appropriately.
---
 cmake/cmake.h.in           |  2 ++
 cmake/platforms/unix.cmake | 15 +++++++++++++++
 unix/pageant.c             |  4 ++++
 3 files changed, 21 insertions(+)

diff --git a/cmake/cmake.h.in b/cmake/cmake.h.in
index 4ce869f4..91d52d78 100644
--- a/cmake/cmake.h.in
+++ b/cmake/cmake.h.in
@@ -43,6 +43,8 @@
 #cmakedefine01 HAVE_CLOCK_MONOTONIC
 #cmakedefine01 HAVE_CLOCK_GETTIME
 #cmakedefine01 HAVE_SO_PEERCRED
+#cmakedefine01 HAVE_NULLARY_SETPGRP
+#cmakedefine01 HAVE_BINARY_SETPGRP
 #cmakedefine01 HAVE_PANGO_FONT_FAMILY_IS_MONOSPACE
 #cmakedefine01 HAVE_PANGO_FONT_MAP_LIST_FAMILIES
 
diff --git a/cmake/platforms/unix.cmake b/cmake/platforms/unix.cmake
index 04db8129..98474485 100644
--- a/cmake/platforms/unix.cmake
+++ b/cmake/platforms/unix.cmake
@@ -51,6 +51,21 @@ int main(int argc, char **argv) {
            cr.pid + cr.uid + cr.gid;
 }" HAVE_SO_PEERCRED)
 
+check_c_source_compiles("
+#include <sys/types.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+    setpgrp();
+}" HAVE_NULLARY_SETPGRP)
+check_c_source_compiles("
+#include <sys/types.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+    setpgrp(0, 0);
+}" HAVE_BINARY_SETPGRP)
+
 if(HAVE_GETADDRINFO AND PUTTY_IPV6)
   set(NO_IPV6 OFF)
 else()
diff --git a/unix/pageant.c b/unix/pageant.c
index cef57b5b..6d125fce 100644
--- a/unix/pageant.c
+++ b/unix/pageant.c
@@ -330,7 +330,11 @@ void pageant_fork_and_print_env(bool retain_tty)
         /* Get out of our previous process group, to avoid being
          * blasted by passing signals. But keep our controlling tty,
          * so we can keep checking to see if we still have one. */
+#if defined HAVE_NULLARY_SETPGRP
         setpgrp();
+#elif defined HAVE_BINARY_SETPGRP
+        setpgrp(0, 0);
+#endif
     } else {
         /* Do that, but also leave our entire session and detach from
          * the controlling tty (if any). */