fpm allow to ptrace/make the the process dumpable for FreeBSD. (#7375)

Author: devnexen

sapi/fpm/config.m4

@@ -25,6 +25,18 @@ AC_DEFUN([AC_FPM_PRCTL],
   ])
 ])
 
+AC_DEFUN([AC_FPM_PROCCTL],
+[
+  AC_MSG_CHECKING([for procctl])
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/procctl.h>]], [[procctl(0, 0, 0, 0);]])], [
+    AC_DEFINE([HAVE_PROCCTL], 1, [do we have procctl?])
+    AC_MSG_RESULT([yes])
+  ], [
+    AC_MSG_RESULT([no])
+  ])
+])
+
 AC_DEFUN([AC_FPM_CLOCK],
 [
   have_clock_gettime=no
@@ -494,6 +506,7 @@ if test "$PHP_FPM" != "no"; then
 
   AC_FPM_STDLIBS
   AC_FPM_PRCTL
+  AC_FPM_PROCCTL
   AC_FPM_CLOCK
   AC_FPM_TRACE
   AC_FPM_BUILTIN_ATOMIC

sapi/fpm/fpm/fpm_unix.c

@@ -15,6 +15,10 @@
 #include <sys/prctl.h>
 #endif
 
+#ifdef HAVE_PROCCTL
+#include <sys/procctl.h>
+#endif
+
 #ifdef HAVE_APPARMOR
 #include <sys/apparmor.h>
 #endif
@@ -409,6 +413,13 @@ int fpm_unix_init_child(struct fpm_worker_pool_s *wp) /* {{{ */
 	}
 #endif
 
+#ifdef HAVE_PROCCTL
+	int dumpable = PROC_TRACE_CTL_ENABLE;
+	if (wp->config->process_dumpable && -1 == procctl(P_PID, getpid(), PROC_TRACE_CTL, &dumpable)) {
+		zlog(ZLOG_SYSERROR, "[pool %s] failed to procctl(PROC_TRACE_CTL)", wp->config->name);
+	}
+#endif
+
 	if (0 > fpm_clock_init()) {
 		return -1;
 	}

sapi/fpm/www.conf.in

@@ -70,7 +70,8 @@ listen = 127.0.0.1:9000
 ; Default Value: no set
 ; process.priority = -19
 
-; Set the process dumpable flag (PR_SET_DUMPABLE prctl) even if the process user
+; Set the process dumpable flag (PR_SET_DUMPABLE prctl for Linux or
+; PROC_TRACE_CTL procctl for FreeBSD) even if the process user
 ; or group is different than the master process user. It allows to create process
 ; core dump and ptrace the process for the pool user.
 ; Default Value: no