[v2] test: fix prefix discovery

diff --git a/test/test/process.h b/test/test/process.h
index 11986d5c2..ba3a18502 100644
--- a/test/test/process.h
+++ b/test/test/process.h
@@ -5,6 +5,11 @@ 
 #ifndef _PROCESS_H_
 #define _PROCESS_H_
 
+#include <limits.h> /* PATH_MAX */
+#include <libgen.h> /* basename et al */
+#include <stdlib.h> /* NULL */
+#include <unistd.h> /* readlink */
+
 #ifdef RTE_EXEC_ENV_BSDAPP
 #define self "curproc"
 #define exe "file"
@@ -61,4 +66,28 @@  process_dup(const char *const argv[], int numargs, const char *env_value)
 	return status;
 }
 
+/* FreeBSD doesn't support file prefixes, so force compile failures for any
+ * tests attempting to use this function on FreeBSD.
+ */
+#ifdef RTE_EXEC_ENV_LINUXAPP
+static char *
+get_current_prefix(char *prefix, int size)
+{
+	char path[PATH_MAX] = {0};
+	char buf[PATH_MAX] = {0};
+
+	/* get file for config (fd is always 3) */
+	snprintf(path, sizeof(path), "/proc/self/fd/%d", 3);
+
+	/* return NULL on error */
+	if (readlink(path, buf, sizeof(buf)) == -1)
+		return NULL;
+
+	/* get the prefix */
+	snprintf(prefix, size, "%s", basename(dirname(buf)));
+
+	return prefix;
+}
+#endif
+
 #endif /* _PROCESS_H_ */
diff --git a/test/test/test_eal_flags.c b/test/test/test_eal_flags.c
index f840ca50b..c9a1d3a12 100644
--- a/test/test/test_eal_flags.c
+++ b/test/test/test_eal_flags.c
@@ -221,30 +221,6 @@  get_number_of_sockets(void)
 }
 #endif
 
-static char*
-get_current_prefix(char * prefix, int size)
-{
-	char path[PATH_MAX] = {0};
-	char buf[PATH_MAX] = {0};
-
-	/* get file for config (fd is always 3) */
-	snprintf(path, sizeof(path), "/proc/self/fd/%d", 3);
-
-	/* return NULL on error */
-	if (readlink(path, buf, sizeof(buf)) == -1)
-		return NULL;
-
-	/* get the basename */
-	snprintf(buf, sizeof(buf), "%s", basename(buf));
-
-	/* copy string all the way from second char up to start of _config */
-	snprintf(prefix, size, "%.*s",
-			(int)(strnlen(buf, sizeof(buf)) - sizeof("_config")),
-			&buf[1]);
-
-	return prefix;
-}
-
 /*
  * Test that the app doesn't run with invalid whitelist option.
  * Final tests ensures it does run with valid options as sanity check (one
@@ -697,16 +673,18 @@  test_invalid_n_flag(void)
 static int
 test_no_hpet_flag(void)
 {
-	char prefix[PATH_MAX], tmp[PATH_MAX];
+	char prefix[PATH_MAX] = "";
 
 #ifdef RTE_EXEC_ENV_BSDAPP
 	return 0;
-#endif
+#else
+	char tmp[PATH_MAX];
 	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
 		printf("Error - unable to get current prefix!\n");
 		return -1;
 	}
 	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
+#endif
 
 	/* With --no-hpet */
 	const char *argv1[] = {prgname, prefix, mp_flag, no_hpet, "-c", "1", "-n", "2"};
@@ -977,9 +955,15 @@  test_file_prefix(void)
 	 * 6. run a primary process with memtest2 prefix
 	 * 7. check that only memtest2 hugefiles are present in the hugedir
 	 */
+	char prefix[PATH_MAX] = "";
 
 #ifdef RTE_EXEC_ENV_BSDAPP
 	return 0;
+#else
+	if (get_current_prefix(prefix, sizeof(prefix)) == NULL) {
+		printf("Error - unable to get current prefix!\n");
+		return -1;
+	}
 #endif
 
 	/* this should fail unless the test itself is run with "memtest" prefix */
@@ -994,12 +978,6 @@  test_file_prefix(void)
 	const char *argv2[] = {prgname, "-c", "1", "-n", "2", "-m", DEFAULT_MEM_SIZE,
 				"--file-prefix=" memtest2 };
 
-	char prefix[32];
-	if (get_current_prefix(prefix, sizeof(prefix)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-
 	/* check if files for current prefix are present */
 	if (process_hugefiles(prefix, HUGEPAGE_CHECK_EXISTS) != 1) {
 		printf("Error - hugepage files for %s were not created!\n", prefix);
diff --git a/test/test/test_mp_secondary.c b/test/test/test_mp_secondary.c
index cc46cf4de..b597dfcdf 100644
--- a/test/test/test_mp_secondary.c
+++ b/test/test/test_mp_secondary.c
@@ -50,32 +50,6 @@ 
 #define launch_proc(ARGV) process_dup(ARGV, \
 		sizeof(ARGV)/(sizeof(ARGV[0])), __func__)
 
-#ifdef RTE_EXEC_ENV_LINUXAPP
-static char*
-get_current_prefix(char * prefix, int size)
-{
-	char path[PATH_MAX] = {0};
-	char buf[PATH_MAX] = {0};
-
-	/* get file for config (fd is always 3) */
-	snprintf(path, sizeof(path), "/proc/self/fd/%d", 3);
-
-	/* return NULL on error */
-	if (readlink(path, buf, sizeof(buf)) == -1)
-		return NULL;
-
-	/* get the basename */
-	snprintf(buf, sizeof(buf), "%s", basename(buf));
-
-	/* copy string all the way from second char up to start of _config */
-	snprintf(prefix, size, "%.*s",
-			(int)(strnlen(buf, sizeof(buf)) - sizeof("_config")),
-			&buf[1]);
-
-	return prefix;
-}
-#endif
-
 /*
  * This function is called in the primary i.e. main test, to spawn off secondary
  * processes to run actual mp tests. Uses fork() and exec pair