builtin/gc: correct total_ram calculation with HAVE_BSD_SYSCTL
The calls to sysctl() assume a 64-bit memory size for the variable holding the value, but the actual size depends on the key name and platform, at least for HW_PHYSMEM. Detect any mismatched reads, and retry with a shorter variable when needed. Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Carlo Marcelo Arenas Belón committed
Jul 7, 2025 at 09:45 UTC
781c1cf5712f1768278f7f926f39ebad3be4aae0
1 file changed
+10
-3
builtin/gc.c
+10
-3
index 7dc94f243d..6880f5b13d 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -517,7 +517,7 @@ static uint64_t total_ram(void)
return total;
}
#elif defined(HAVE_BSD_SYSCTL) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM) || defined(HW_PHYSMEM64))
- int64_t physical_memory;
+ uint64_t physical_memory;
int mib[2];
size_t length;
@@ -529,9 +529,16 @@ static uint64_t total_ram(void)
# else
mib[1] = HW_PHYSMEM;
# endif
- length = sizeof(int64_t);
- if (!sysctl(mib, 2, &physical_memory, &length, NULL, 0))
+ length = sizeof(physical_memory);
+ if (!sysctl(mib, 2, &physical_memory, &length, NULL, 0)) {
+ if (length == 4) {
+ uint32_t mem;
+
+ if (!sysctl(mib, 2, &mem, &length, NULL, 0))
+ physical_memory = mem;
+ }
return physical_memory;
+ }
#elif defined(GIT_WINDOWS_NATIVE)
MEMORYSTATUSEX memInfo;