[dpdk-dev] [PATCH] eal: create a runtime directory on windows

[Pallavi Kadam <pallavi.kadam@intel.com>]

Added eal_create_runtime_dir() function in order to run any application
as a user that does not have administrator access.
Currently, since there is no runtime directory set, the code tries to
create a file in C:\ which is only writable with administrator
privileges. As a result, if the user is not admin, the application will
fail.

Signed-off-by: Ranjit Menon <ranjit.menon@intel.com>
Signed-off-by: Pallavi Kadam <pallavi.kadam@intel.com>
---
 lib/librte_eal/windows/eal.c | 57 ++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
index 6334aca03..b0f356405 100644
--- a/lib/librte_eal/windows/eal.c
+++ b/lib/librte_eal/windows/eal.c
@@ -5,6 +5,7 @@
 #include <fcntl.h>
 #include <io.h>
 #include <share.h>
+#include <direct.h>
 #include <sys/stat.h>
 
 #include <rte_debug.h>
@@ -34,6 +35,55 @@ static int mem_cfg_fd = -1;
 /* internal configuration (per-core) */
 struct lcore_config lcore_config[RTE_MAX_LCORE];
 
+int
+eal_create_runtime_dir(void)
+{
+	char temp_dir[PATH_MAX];
+	char runtime_dir[PATH_MAX];
+	int ret;
+
+	/* get user-writable temp path */
+	if (GetTempPathA(sizeof(temp_dir), temp_dir) == 0) {
+		RTE_LOG_WIN32_ERR("GetTempPath");
+		return -1;
+	}
+
+	/* create DPDK runtime subdirectory under temp dir */
+	ret = strcat_s(temp_dir, sizeof(temp_dir), "dpdk");
+	if (ret != 0) {
+		RTE_LOG(ERR, EAL, "Error creating DPDK runtime path name\n");
+		return -1;
+	}
+
+	/* create prefix-specific subdirectory under DPDK runtime dir */
+	ret = snprintf(runtime_dir, sizeof(runtime_dir), "%s\\%s",
+		temp_dir, eal_get_hugefile_prefix());
+	if (ret < 0 || ret == sizeof(runtime_dir)) {
+		RTE_LOG(ERR, EAL, "Error creating prefix-specific runtime path\n");
+		return -1;
+	}
+
+	/* create the path if it doesn't exist - step by step */
+	ret = _mkdir(temp_dir);
+	if (ret < 0 && errno != EEXIST) {
+		RTE_LOG(ERR, EAL, "Error creating '%s': %s\n",
+			temp_dir, strerror(errno));
+		return -1;
+	}
+
+	ret = _mkdir(runtime_dir);
+	if (ret < 0 && errno != EEXIST) {
+		RTE_LOG(ERR, EAL, "Error creating '%s': %s\n",
+			runtime_dir, strerror(errno));
+		return -1;
+	}
+
+	if (eal_set_runtime_dir(runtime_dir, sizeof(runtime_dir)))
+		return -1;
+
+	return 0;
+}
+
 /* Detect if we are a primary or a secondary process */
 enum rte_proc_type_t
 eal_proc_type_detect(void)
@@ -181,6 +231,13 @@ eal_parse_args(int argc, char **argv)
 		}
 	}
 
+	/* create runtime data directory */
+	if (internal_conf->no_shconf == 0 &&
+			eal_create_runtime_dir() < 0) {
+		RTE_LOG(ERR, EAL, "Cannot create runtime directory\n");
+		return -1;
+	}
+
 	if (eal_adjust_config(internal_conf) != 0)
 		return -1;
 
-- 
2.18.0.windows.1