MINOR: debug: prepare to show runtime limits

This is a preparation patch to extend postmortem in order to store runtime
limits. No need to perform getrlimit() in feed_post_mortem(), as we do this
in the very beginning of main() and we store initial fd limits in global
'rlim_fd_cur_at_boot' and 'rlim_fd_max_at_boot' variables.

diff --git a/src/debug.c b/src/debug.c
index 79ace2ae34c2b5837db3251898c79ee3d83a53f7..683f36e27badfee58287ec79ccadf89db56687a4 100644 (file)
--- a/src/debug.c
+++ b/src/debug.c
@@ -129,8 +129,8 @@ struct post_mortem {
                        int err_run; // errno, if capget() syscall fails at runtime
                } caps;
 #endif
-               struct rlimit limit_fd;  // RLIMIT_NOFILE
-               struct rlimit limit_ram; // RLIMIT_DATA
+               struct rlimit boot_lim_fd;  // RLIMIT_NOFILE at startup
+               struct rlimit boot_lim_ram; // RLIMIT_DATA at startup
                char **argv;
 
 #if defined(USE_THREAD)
@@ -606,14 +606,15 @@ static int debug_parse_cli_show_dev(char **args, char *payload, struct appctx *a
                chunk_appendf(&trash, "  capget() failed at runtime with: %s.\n",
                              strerror(post_mortem.process.caps.err_run));
 #endif
-       chunk_appendf(&trash, "  fd limit (soft): %s\n",
-                     LIM2A(normalize_rlim((ulong)post_mortem.process.limit_fd.rlim_cur), "unlimited"));
-       chunk_appendf(&trash, "  fd limit (hard): %s\n",
-                     LIM2A(normalize_rlim((ulong)post_mortem.process.limit_fd.rlim_max), "unlimited"));
-       chunk_appendf(&trash, "  ram limit (soft): %s\n",
-                     LIM2A(normalize_rlim((ulong)post_mortem.process.limit_ram.rlim_cur), "unlimited"));
-       chunk_appendf(&trash, "  ram limit (hard): %s\n",
-                     LIM2A(normalize_rlim((ulong)post_mortem.process.limit_ram.rlim_max), "unlimited"));
+       chunk_appendf(&trash, "  boot limits:\n");
+       chunk_appendf(&trash, "  \tfd limit (soft): %s\n",
+                     LIM2A(normalize_rlim((ulong)post_mortem.process.boot_lim_fd.rlim_cur), "unlimited"));
+       chunk_appendf(&trash, "  \tfd limit (hard): %s\n",
+                     LIM2A(normalize_rlim((ulong)post_mortem.process.boot_lim_fd.rlim_max), "unlimited"));
+       chunk_appendf(&trash, "  \tram limit (soft): %s\n",
+                     LIM2A(normalize_rlim((ulong)post_mortem.process.boot_lim_ram.rlim_cur), "unlimited"));
+       chunk_appendf(&trash, "  \tram limit (hard): %s\n",
+                     LIM2A(normalize_rlim((ulong)post_mortem.process.boot_lim_ram.rlim_max), "unlimited"));
 
        return cli_msg(appctx, LOG_INFO, trash.area);
 }
@@ -2345,8 +2346,9 @@ static int feed_post_mortem()
        if (capget(&cap_hdr_haproxy, post_mortem.process.caps.boot) == -1)
                post_mortem.process.caps.err_boot = errno;
 #endif
-       getrlimit(RLIMIT_NOFILE, &post_mortem.process.limit_fd);
-       getrlimit(RLIMIT_DATA, &post_mortem.process.limit_ram);
+       post_mortem.process.boot_lim_fd.rlim_cur = rlim_fd_cur_at_boot;
+       post_mortem.process.boot_lim_fd.rlim_max = rlim_fd_max_at_boot;
+       getrlimit(RLIMIT_DATA, &post_mortem.process.boot_lim_ram);
 
        if (strcmp(post_mortem.platform.utsname.sysname, "Linux") == 0)
                feed_post_mortem_linux();