daemon: fix type of max_connections

The `max_connections` type tracks how many children git-daemon(1) would
spawn at the same time. This value can be controlled via a command line
switch: if given a positive value we'll set that up as the limit. But
when given either zero or a negative value we don't enforce any limit at
all.

But even when being passed a negative value we won't actually store it,
but normalize it to 0. Still, the variable used to store the config is
using a signed integer, which causes warnings when comparing the number
of accepted connections (`max_connections`) with the number of current
connections being handled (`live_children`).

Adapt the type of `max_connections` such that the types of both
variables match.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

daemon.c

@@ -1,5 +1,4 @@
 #define USE_THE_REPOSITORY_VARIABLE
-#define DISABLE_SIGN_COMPARE_WARNINGS
 
 #include "git-compat-util.h"
 #include "abspath.h"
@@ -801,8 +800,7 @@ static int addrcmp(const struct sockaddr_storage *s1,
 	return 0;
 }
 
-static int max_connections = 32;
-
+static unsigned int max_connections = 32;
 static unsigned int live_children;
 
 static struct child {
@@ -1315,10 +1313,11 @@ int cmd_main(int argc, const char **argv)
 			continue;
 		}
 		if (skip_prefix(arg, "--max-connections=", &v)) {
-			if (strtol_i(v, 10, &max_connections))
+			int parsed_value;
+			if (strtol_i(v, 10, &parsed_value))
 				die(_("invalid max-connections '%s', expecting an integer"), v);
-			if (max_connections < 0)
-				max_connections = 0;  /* unlimited */
+			/* A negative value indicates unlimited children. */
+			max_connections = parsed_value < 0 ? 0 : parsed_value;
 			continue;
 		}
 		if (!strcmp(arg, "--strict-paths")) {