1 files changed, 48 insertions, 0 deletions
diff --git a/src/chkspawn.c b/src/chkspawn.c
new file mode 100644
index 0000000..511489a
--- /dev/null
+++ b/src/chkspawn.c
@@ -0,0 +1,48 @@
+#include "buffer.h"
+#include "fmt.h"
+#include "select.h"
+#include "exit.h"
+#include "auto_spawn.h"
+#define MAXSPAWN 1000	 /* Silent spawn limit increased to 1000 */
+
+char num[FMT_ULONG];
+fd_set fds;
+
+int main()
+{
+  unsigned long hiddenlimit;
+  unsigned long maxnumd;
+ 
+  hiddenlimit = sizeof(fds) * 8;
+  maxnumd = (hiddenlimit - 5) / 2;
+ 
+  if (auto_spawn < 1) {
+    buffer_puts(buffer_2,"Oops. You have set conf-spawn lower than 1.\n");
+    buffer_flush(buffer_2);
+    _exit(1);
+  }
+
+  if (auto_spawn > MAXSPAWN) {
+    buffer_puts(buffer_2,"Oops. You have set conf-spawn higher than MAXSPAWN.\n");
+    buffer_flush(buffer_2);
+    _exit(1);
+  }
+
+  if (auto_spawn > maxnumd) {
+    buffer_puts(buffer_2,"Oops. Your system's FD_SET() has a hidden limit of ");
+    buffer_put(buffer_2,num,fmt_ulong(num,hiddenlimit));
+    buffer_puts(buffer_2," descriptors.\n\
+This means that the qmail daemons could crash if you set the run-time\n\
+concurrency higher than ");
+    buffer_put(buffer_2,num,fmt_ulong(num,maxnumd));
+    buffer_puts(buffer_2,". So I'm going to insist that the concurrency\n\
+limit in conf-spawn be at most ");
+    buffer_put(buffer_2,num,fmt_ulong(num,maxnumd));
+    buffer_puts(buffer_2,". Right now it's ");
+    buffer_put(buffer_2,num,fmt_ulong(num,(unsigned long) auto_spawn));
+    buffer_puts(buffer_2,".\n");
+    buffer_flush(buffer_2);
+    _exit(1);
+  }
+  _exit(0);
+}