vfio: avoid enabling while the module is not loaded

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal.c

diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 2fb1acc..648ef81 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -859,3 +859,30 @@ int rte_eal_has_hugepages(void)
 {
        return ! internal_config.no_hugetlbfs;
 }
+
+int
+rte_eal_check_module(const char *module_name)
+{
+       char mod_name[30]; /* Any module names can be longer than 30 bytes? */
+       int ret = 0;
+
+       if (NULL == module_name)
+               return -1;
+
+       FILE *fd = fopen("/proc/modules", "r");
+       if (NULL == fd) {
+               RTE_LOG(ERR, EAL, "Open /proc/modules failed!"
+                       " error %i (%s)\n", errno, strerror(errno));
+               return -1;
+       }
+       while (!feof(fd)) {
+               fscanf(fd, "%29s %*[^\n]", mod_name);
+               if (!strcmp(mod_name, module_name)) {
+                       ret = 1;
+                       break;
+               }
+       }
+       fclose(fd);
+
+       return ret;
+}