blogc: do not add rusage vars if not supported

3 files changed, 22 insertions, 1 deletions

diff --git a/src/blogc/funcvars.c b/src/blogc/funcvars.c
index a3af274..8524568 100644
--- a/src/blogc/funcvars.c
+++ b/src/blogc/funcvars.c
@@ -19,8 +19,12 @@ static const struct func_map {
     const char *variable;
     const blogc_funcvars_func_t func;
 } funcs[] = {
+
+#ifdef HAVE_RUSAGE
     {"BLOGC_RUSAGE_CPU_TIME", blogc_rusage_cpu_time},
     {"BLOGC_RUSAGE_MEMORY", blogc_rusage_memory},
+#endif
+
     {NULL, NULL},
 };
 
diff --git a/src/blogc/rusage.c b/src/blogc/rusage.c
index b04938e..972ae4f 100644
--- a/src/blogc/rusage.c
+++ b/src/blogc/rusage.c
@@ -24,16 +24,19 @@
 // FIXME: optimize to use a single syscall for both cpu time and memory?
 
 
-#include <stdio.h>
 long long
 blogc_rusage_get_cpu_time(void)
 {
+#ifndef HAVE_RUSAGE
+    return 0;
+#else
     struct rusage usage;
     if (0 != getrusage(RUSAGE_SELF, &usage))
         return 0;
     return (
         (usage.ru_utime.tv_sec * 1000000) + usage.ru_utime.tv_usec +
         (usage.ru_stime.tv_sec * 1000000) + usage.ru_stime.tv_usec);
+#endif
 }
 
 
@@ -62,10 +65,14 @@ blogc_rusage_cpu_time(void)
 long
 blogc_rusage_get_memory(void)
 {
+#ifndef HAVE_RUSAGE
+    return 0;
+#else
     struct rusage usage;
     if (0 != getrusage(RUSAGE_SELF, &usage))
         return 0;
     return usage.ru_maxrss;
+#endif
 }
 
 
diff --git a/src/blogc/rusage.h b/src/blogc/rusage.h
index cfdccbe..d94aebd 100644
--- a/src/blogc/rusage.h
+++ b/src/blogc/rusage.h
@@ -9,6 +9,16 @@
 #ifndef ___RUSAGE_H
 #define ___RUSAGE_H
 
+#ifdef HAVE_SYS_RESOURCE_H
+#define HAVE_RUSAGE
+#endif
+
+typedef struct {
+    long long cpu_time;  // in microseconds
+    long memory;         // in kilobytes
+} blogc_rusage_t;
+
+blogc_rusage_t* blogc_rusage_get(void);
 long long blogc_rusage_get_cpu_time(void);  // in microseconds
 long blogc_rusage_get_memory(void);         // in kilobytes