eal/windows: add missing SPDX license tag

[dpdk.git] / lib / librte_eal / common / eal_common_options.c

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 424e8bc..622c7bc 100644 (file)
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -494,6 +494,39 @@ out:
        return retval;
 }
 
+static int
+is_shared_build(void)
+{
+#define EAL_SO "librte_eal.so"
+       char soname[32];
+       size_t len, minlen = strlen(EAL_SO);
+
+       len = strlcpy(soname, EAL_SO"."ABI_VERSION, sizeof(soname));
+       if (len > sizeof(soname)) {
+               RTE_LOG(ERR, EAL, "Shared lib name too long in shared build check\n");
+               len = sizeof(soname) - 1;
+       }
+
+       while (len >= minlen) {
+               /* check if we have this .so loaded, if so - shared build */
+               RTE_LOG(DEBUG, EAL, "Checking presence of .so '%s'\n", soname);
+               if (dlopen(soname, RTLD_LAZY | RTLD_NOLOAD) != NULL) {
+                       RTE_LOG(INFO, EAL, "Detected shared linkage of DPDK\n");
+                       return 1;
+               }
+
+               /* remove any version numbers off the end to retry */
+               while (len-- > 0)
+                       if (soname[len] == '.') {
+                               soname[len] = '\0';
+                               break;
+                       }
+       }
+
+       RTE_LOG(INFO, EAL, "Detected static linkage of DPDK\n");
+       return 0;
+}
+
 int
 eal_plugins_init(void)
 {
@@ -505,7 +538,7 @@ eal_plugins_init(void)
         * (Using dlopen with NOLOAD flag on EAL, will return NULL if the EAL
         * shared library is not already loaded i.e. it's statically linked.)
         */
-       if (dlopen("librte_eal.so."ABI_VERSION, RTLD_LAZY | RTLD_NOLOAD) != NULL &&
+       if (is_shared_build() &&
                        *default_solib_dir != '\0' &&
                        stat(default_solib_dir, &sb) == 0 &&
                        S_ISDIR(sb.st_mode))