MINOR: debug: collect some boot-time info related to the process

Here we collect the original uid/gid/rlimits for FD and RAM since these
ones do affect behavior and are sometimes different from expected in
containers or when starting as a service.

diff --git a/src/debug.c b/src/debug.c
index 5a8ed6b8ec03df1252f9ddc3bbe5f5129a60467d..78d913696f352787b78fe6adfd28e50a0024a5b1 100644 (file)
--- a/src/debug.c
+++ b/src/debug.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <syslog.h>
+#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
@@ -89,6 +90,15 @@ struct post_mortem {
                char virt_techno[16];   // when provided by cpuid
                char cont_techno[16];   // empty, "no", "yes", "docker" or others
        } platform;
+
+       /* process-specific information */
+       struct {
+               pid_t pid;
+               uid_t boot_uid;
+               gid_t boot_gid;
+               struct rlimit limit_fd;  // RLIMIT_NOFILE
+               struct rlimit limit_ram; // RLIMIT_AS or RLIMIT_DATA
+       } process;
 } post_mortem ALIGNED(256) = { };
 
 /* Points to a copy of the buffer where the dump functions should write, when
@@ -486,6 +496,20 @@ static int debug_parse_cli_show_dev(char **args, char *payload, struct appctx *a
        if (*post_mortem.platform.utsname.nodename)
                chunk_appendf(&trash, "  node name: %s\n", HA_ANON_CLI(post_mortem.platform.utsname.nodename));
 
+       chunk_appendf(&trash, "Process info\n");
+       chunk_appendf(&trash, "  pid: %d\n", post_mortem.process.pid);
+       chunk_appendf(&trash, "  boot uid: %d\n", post_mortem.process.boot_uid);
+       chunk_appendf(&trash, "  boot gid: %d\n", post_mortem.process.boot_gid);
+
+       if ((ulong)post_mortem.process.limit_fd.rlim_cur != RLIM_INFINITY)
+               chunk_appendf(&trash, "  fd limit (soft): %lu\n", (ulong)post_mortem.process.limit_fd.rlim_cur);
+       if ((ulong)post_mortem.process.limit_fd.rlim_max != RLIM_INFINITY)
+               chunk_appendf(&trash, "  fd limit (hard): %lu\n", (ulong)post_mortem.process.limit_fd.rlim_max);
+       if ((ulong)post_mortem.process.limit_ram.rlim_cur != RLIM_INFINITY)
+               chunk_appendf(&trash, "  ram limit (soft): %lu\n", (ulong)post_mortem.process.limit_ram.rlim_cur);
+       if ((ulong)post_mortem.process.limit_ram.rlim_max != RLIM_INFINITY)
+               chunk_appendf(&trash, "  ram limit (hard): %lu\n", (ulong)post_mortem.process.limit_ram.rlim_max);
+
        return cli_msg(appctx, LOG_INFO, trash.area);
 }
 
@@ -2101,6 +2125,18 @@ static int feed_post_mortem()
        /* kernel type, version and arch */
        uname(&post_mortem.platform.utsname);
 
+       /* some boot-time info related to the process */
+       post_mortem.process.pid = getpid();
+       post_mortem.process.boot_uid = geteuid();
+       post_mortem.process.boot_gid = getegid();
+
+       getrlimit(RLIMIT_NOFILE, &post_mortem.process.limit_fd);
+#if defined(RLIMIT_AS)
+       getrlimit(RLIMIT_AS, &post_mortem.process.limit_ram);
+#elif defined(RLIMIT_DATA)
+       getrlimit(RLIMIT_DATA, &post_mortem.process.limit_ram);
+#endif
+
        if (strcmp(post_mortem.platform.utsname.sysname, "Linux") == 0)
                feed_post_mortem_linux();