Add tests for further sys/resource.h constants

tests/Makefile

@@ -162,6 +162,7 @@ NAMES=\
 	stdlib/mktemp \
 	stdlib/realpath \
 	sys_epoll/epoll \
+	sys_resource/constants \
 	sys_utsname/uname \
 	time/gettimeofday \
 	unistd/chdir \
@@ -188,7 +189,6 @@ NAMES=\
 	grp/getgrgid_r \
 	grp/getgrnam_r \
 	grp/gr_iter \
-	resource/prio_process \
 #	resource/getrusage
 #	time/times
 

tests/resource/prio_process.c

@@ -1,8 +0,0 @@
-#include <stdio.h>
-#include <sys/resource.h>
-
-int main(void) {
-    printf("PRIO_PROCESS: %d", PRIO_PROCESS);
-    return 0;
-}
-

tests/sys_resource/constants.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <sys/resource.h>
+
+int main(void) {
+    // Checks availability of constants specified in
+    // https://pubs.opengroup.org/onlinepubs/7908799/xsh/sysresource.h.html
+    printf("PRIO_PROCESS: %d\n", PRIO_PROCESS);
+    printf("PRIO_PGRP: %d\n", PRIO_PGRP);
+    printf("PRIO_USER: %d\n", PRIO_USER);
+
+    printf("RLIM_INFINITY: %lld\n", RLIM_INFINITY);
+    printf("RLIM_SAVED_MAX: %lld\n", RLIM_SAVED_MAX);
+    printf("RLIM_SAVED_CUR: %lld\n", RLIM_SAVED_CUR);
+
+    printf("RUSAGE_SELF: %lld\n", RUSAGE_SELF);
+    printf("RUSAGE_CHILDREN: %lld\n", RUSAGE_CHILDREN);
+
+    printf("RLIMIT_CORE: %lld\n", RLIMIT_CORE);
+    printf("RLIMIT_CPU: %lld\n", RLIMIT_CPU);
+    printf("RLIMIT_DATA: %lld\n", RLIMIT_DATA);
+    printf("RLIMIT_FSIZE: %lld\n", RLIMIT_FSIZE);
+    printf("RLIMIT_NOFILE: %lld\n", RLIMIT_NOFILE);
+    printf("RLIMIT_STACK: %lld\n", RLIMIT_STACK);
+    printf("RLIMIT_AS: %lld\n", RLIMIT_AS);
+
+    return 0;
+}