[PATCH v5 2/8] test: refactor file prefix arg handling

Stephen Hemminger
2025-11-21T17:10:04Z

Make setting up --file-prefix arg logic into a function,
and avoid impossible case of file prefix path causing overflow
of string.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
app/test/test_eal_flags.c | 126 +++++++++++++-------------------------
1 file changed, 42 insertions(+), 84 deletions(-)

diff --git a/app/test/test_eal_flags.c b/app/test/test_eal_flags.c
index e32f83d3c8..c2e6c00edb 100644
--- a/app/test/test_eal_flags.c
+++ b/app/test/test_eal_flags.c
@@ -121,6 +121,8 @@ test_misc_flags(void)
#define no_shconf "--no-shconf"
#define allow "--allow"
#define vdev "--vdev"
+#define file_prefix "--file-prefix"
+
#define memtest "memtest"
#define memtest1 "memtest1"
#define memtest2 "memtest2"
@@ -312,6 +314,25 @@ get_number_of_sockets(void)
}
#endif

+static const char *
+get_file_prefix(void)
+{
+#ifdef RTE_EXEC_ENV_FREEBSD
+ /* BSD target doesn't support prefixes at this point */
+ return "";
+#else
+ static char prefix[PATH_MAX + sizeof(file_prefix)];
+ char tmp[PATH_MAX];
+
+ if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
+ printf("Error - unable to get current prefix!\n");
+ return NULL;
+ }
+ snprintf(prefix, sizeof(prefix), file_prefix "=%s", tmp);
+ return prefix;
+#endif
+}
+
/*
* Test that the app doesn't run with invalid allow option.
* Final tests ensures it does run with valid options as sanity check (one
@@ -320,18 +341,10 @@ get_number_of_sockets(void)
static int
test_allow_flag(void)
{
- unsigned i;
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ unsigned int i;
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

const char *wlinval[][7] = {
{prgname, prefix, mp_flag,
@@ -387,17 +400,9 @@ test_allow_flag(void)
static int
test_invalid_b_flag(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

const char *blinval[][5] = {
{prgname, prefix, mp_flag, "-b", "error"},
@@ -491,17 +496,9 @@ test_invalid_vdev_flag(void)
static int
test_invalid_r_flag(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

const char *rinval[][5] = {
{prgname, prefix, mp_flag, "-r", "error"},
@@ -535,17 +532,9 @@ test_invalid_r_flag(void)
static int
test_missing_c_flag(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

/* -c flag but no coremask value */
const char *argv1[] = { prgname, prefix, mp_flag, "-c"};
@@ -694,17 +683,9 @@ test_missing_c_flag(void)
static int
test_main_lcore_flag(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char *prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

if (!rte_lcore_is_enabled(0) || !rte_lcore_is_enabled(1))
return TEST_SKIPPED;
@@ -751,17 +732,9 @@ test_main_lcore_flag(void)
static int
test_invalid_n_flag(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

/* -n flag but no value */
const char *argv1[] = { prgname, prefix, no_huge, no_shconf,
@@ -803,18 +776,12 @@ test_invalid_n_flag(void)
static int
test_no_hpet_flag(void)
{
- char prefix[PATH_MAX] = "";
-
#ifdef RTE_EXEC_ENV_FREEBSD
return 0;
#else
- char tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

/* With --no-hpet */
const char *argv1[] = {prgname, prefix, mp_flag, no_hpet};
@@ -829,6 +796,7 @@ test_no_hpet_flag(void)
printf("Error - process did not run ok without --no-hpet flag\n");
return -1;
}
+#
return 0;
}

@@ -898,6 +866,7 @@ test_no_huge_flag(void)
printf("Error - process run ok with --no-huge and --huge-worker-stack=size flags");
return -1;
}
+#endif
return 0;
}

@@ -913,17 +882,14 @@ test_misc_flags(void)
const char * prefix = "";
const char * nosh_prefix = "";
#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
+ const char *prefix = get_file_prefix();
const char * nosh_prefix = "--file-prefix=noshconf";
FILE * hugedir_handle = NULL;
char line[PATH_MAX] = {0};
unsigned i, isempty = 1;

- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);

/*
* get first valid hugepage path
@@ -1525,17 +1491,9 @@ populate_socket_mem_param(int num_sockets, const char *mem,
static int
test_memory_flags(void)
{
-#ifdef RTE_EXEC_ENV_FREEBSD
- /* BSD target doesn't support prefixes at this point */
- const char * prefix = "";
-#else
- char prefix[PATH_MAX], tmp[PATH_MAX];
- if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
- printf("Error - unable to get current prefix!\n");
+ const char *prefix = get_file_prefix();
+ if (prefix == NULL)
return -1;
- }
- snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif

/* valid -m flag and mp flag */
const char *argv0[] = {prgname, prefix, mp_flag,
--
2.51.0