bootchart: ask for --rel when failed to initialize graph start time

[elogind.git] / src / bootchart / bootchart.c

diff --git a/src/bootchart/bootchart.c b/src/bootchart/bootchart.c
index cbfc28d2f137925e82b2f1ba867ebcf4bf64e57c..5683025b1970df3f16da846326f70c2713c68fb8 100644 (file)
--- a/src/bootchart/bootchart.c
+++ b/src/bootchart/bootchart.c
@@ -48,7 +48,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <stdbool.h>
-#include <systemd/sd-journal.h>
+#include "systemd/sd-journal.h"
 
 #include "util.h"
 #include "fileio.h"
@@ -164,21 +164,21 @@ static void help(void) {
 }
 
 static int parse_args(int argc, char *argv[]) {
-        static struct option options[] = {
-                {"rel",       no_argument,        NULL,  'r'},
-                {"freq",      required_argument,  NULL,  'f'},
-                {"samples",   required_argument,  NULL,  'n'},
-                {"pss",       no_argument,        NULL,  'p'},
-                {"output",    required_argument,  NULL,  'o'},
-                {"init",      required_argument,  NULL,  'i'},
-                {"no-filter", no_argument,        NULL,  'F'},
-                {"cmdline",   no_argument,        NULL,  'C'},
-                {"control-group", no_argument,    NULL,  'c'},
-                {"help",      no_argument,        NULL,  'h'},
-                {"scale-x",   required_argument,  NULL,  'x'},
-                {"scale-y",   required_argument,  NULL,  'y'},
-                {"entropy",   no_argument,        NULL,  'e'},
-                {NULL, 0, NULL, 0}
+        static const struct option options[] = {
+                {"rel",           no_argument,        NULL,  'r'},
+                {"freq",          required_argument,  NULL,  'f'},
+                {"samples",       required_argument,  NULL,  'n'},
+                {"pss",           no_argument,        NULL,  'p'},
+                {"output",        required_argument,  NULL,  'o'},
+                {"init",          required_argument,  NULL,  'i'},
+                {"no-filter",     no_argument,        NULL,  'F'},
+                {"cmdline",       no_argument,        NULL,  'C'},
+                {"control-group", no_argument,        NULL,  'c'},
+                {"help",          no_argument,        NULL,  'h'},
+                {"scale-x",       required_argument,  NULL,  'x'},
+                {"scale-y",       required_argument,  NULL,  'y'},
+                {"entropy",       no_argument,        NULL,  'e'},
+                {}
         };
         int c;
 
@@ -310,6 +310,7 @@ int main(int argc, char *argv[]) {
         time_t t = 0;
         int r;
         struct rlimit rlim;
+        bool has_procfs = false;
 
         parse_conf();
 
@@ -349,6 +350,16 @@ int main(int argc, char *argv[]) {
 
         log_uptime();
 
+        if (graph_start < 0.0) {
+                fprintf(stderr,
+                        "Failed to setup graph start time.\n\nThe system uptime "
+                        "probably includes time that the system was suspended. "
+                        "Use --rel to bypass this issue.\n");
+                exit (EXIT_FAILURE);
+        }
+
+        has_procfs = access("/proc/vmstat", F_OK) == 0;
+
         LIST_HEAD_INIT(head);
 
         /* main program loop */
@@ -385,11 +396,11 @@ int main(int argc, char *argv[]) {
                                 parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &build, NULL);
                 }
 
-                /* wait for /proc to become available, discarding samples */
-                if (graph_start <= 0.0)
-                        log_uptime();
-                else
+                if (has_procfs)
                         log_sample(samples, &sampledata);
+                else
+                        /* wait for /proc to become available, discarding samples */
+                        has_procfs = access("/proc/vmstat", F_OK) == 0;
 
                 sample_stop = gettime_ns();