[PATCH 0/1] MR8983: wineserver: Request RLIMIT_NOFILE maximum allowed value.

[Rémi Bernon (＠rbernon)]

Split from https://gitlab.winehq.org/wine/wine/-/merge_requests/8875

[PATCH 1/1] wineserver: Request RLIMIT_NOFILE maximum allowed value.

[Rémi Bernon]

From: Rémi Bernon

---
 server/main.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/server/main.c b/server/main.c
index e014ec535ff..f440c351a74 100644
--- a/server/main.c
+++ b/server/main.c
@@ -28,6 +28,12 @@
 #include <stdlib.h>
 #include <sys/time.h>
 #include <unistd.h>
+#ifdef HAVE_SYS_RESOURCE_H
+# include <sys/resource.h>
+#endif
+#ifdef HAVE_SYS_SYSCTL_H
+# include <sys/sysctl.h>
+#endif

#include "object.h"
 #include "file.h"
@@ -212,6 +218,42 @@ static void sigterm_handler( int signum )
     exit(1);  /* make sure atexit functions get called */
 }

+#ifdef RLIMIT_NOFILE
+static void set_max_limit( int limit )
+{
+    struct rlimit rlimit;
+
+    if (!getrlimit( limit, &rlimit ))
+    {
+        rlimit.rlim_cur = rlimit.rlim_max;
+        if (!setrlimit( limit, &rlimit )) return;
+
+#if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
+        if (limit == RLIMIT_NOFILE)
+        {
+            unsigned int nlimit = 0;
+            size_t size;
+
+            /* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
+             * rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX).
+             *
+             * In later versions it can be set to kern.maxfilesperproc (from
+             * sysctl). In Big Sur and later it can be set to rlim_max. */
+            size = sizeof(nlimit);
+            if (sysctlbyname("kern.maxfilesperproc", &nlimit, &size, NULL, 0) != 0 || nlimit < OPEN_MAX)
+                rlimit.rlim_cur = OPEN_MAX;
+            else
+                rlimit.rlim_cur = nlimit;
+
+            if (!setrlimit( limit, &rlimit )) return;
+            rlimit.rlim_cur = OPEN_MAX;
+            if (!setrlimit( limit, &rlimit )) return;
+        }
+#endif
+    }
+}
+#endif /* RLIMIT_NOFILE */
+
 int main( int argc, char *argv[] )
 {
     setvbuf( stderr, NULL, _IOLBF, 0 );
@@ -225,6 +267,9 @@ int main( int argc, char *argv[] )
     signal( SIGQUIT, sigterm_handler );
     signal( SIGTERM, sigterm_handler );
     signal( SIGABRT, sigterm_handler );
+#ifdef RLIMIT_NOFILE
+    set_max_limit( RLIMIT_NOFILE );
+#endif

sock_init();
     open_master_socket();

[Alfred Agrell (＠Alcaro)]

Alfred Agrell (@Alcaro) commented about server/main.c:
>  exit(1);  /* make sure atexit functions get called */
>
> }
>
> +#ifdef RLIMIT_NOFILE
> +static void set_max_limit( int limit )
> +{
> - struct rlimit rlimit;
> -
> - if (!getrlimit( limit, &rlimit ))
> - {
> -
>    rlimit.rlim_cur = rlimit.rlim_max;
> -
>    if (!setrlimit( limit, &rlimit )) return;
> -
>
> +#if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)

RLIMIT_NOFILE is already checked on line 221.

[Rémi Bernon (＠rbernon)]

On Wed Sep 17 08:57:22 2025 +0000, Alfred Agrell wrote:
> RLIMIT_NOFILE is already checked on line 221.

Right, though I wanted to keep the helper identical to the one in ntdll loader.c, and the check on line 221 is there to avoid an unused function error as it's the only call to `set_max_limit` we have here.