From 7847c1f974f1098cfd4feaa200b72f139ddd66a1 Mon Sep 17 00:00:00 2001
From: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Wed, 16 Jun 2021 02:55:57 +0800
Subject: [PATCH] example/posix_spawn: Ensure argv has filename and NULL
 terminator

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
---
 examples/elf/elf_main.c           |  5 +++--
 examples/nxflat/nxflat_main.c     |  5 +++--
 examples/posix_spawn/spawn_main.c | 27 ++++++++++++++++-----------
 3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/examples/elf/elf_main.c b/examples/elf/elf_main.c
index 94e3454ff..aa10e01d0 100644
--- a/examples/elf/elf_main.c
+++ b/examples/elf/elf_main.c
@@ -206,7 +206,7 @@ int main(int argc, FAR char *argv[])
 #ifdef CONFIG_EXAMPLES_ELF_ROMFS
   struct boardioc_romdisk_s desc;
 #endif
-  FAR char *args[1];
+  FAR char *args[2];
   int ret;
   int i;
 
@@ -357,7 +357,8 @@ int main(int argc, FAR char *argv[])
        * table information is available within the OS.
        */
 
-      args[0] = NULL;
+      args[0] = (FAR char *)dirlist[i];
+      args[1] = NULL;
       ret = exec(filename, args, g_elf_exports, g_elf_nexports);
 
       mm_update(&g_mmstep, "after exec");
diff --git a/examples/nxflat/nxflat_main.c b/examples/nxflat/nxflat_main.c
index 568aa328d..e951ca0dc 100644
--- a/examples/nxflat/nxflat_main.c
+++ b/examples/nxflat/nxflat_main.c
@@ -135,7 +135,7 @@ static inline void testheader(FAR const char *progname)
 
 int main(int argc, FAR char *argv[])
 {
-  FAR char *args[1];
+  FAR char *args[2];
   int ret;
   int i;
   struct boardioc_romdisk_s desc;
@@ -211,7 +211,8 @@ int main(int argc, FAR char *argv[])
        * table information is available within the OS.
        */
 
-      args[0] = NULL;
+      args[0] = (FAR char *)dirlist[i];
+      args[1] = NULL;
       ret = exec(filename, args, g_nxflat_exports, g_nxflat_nexports);
       if (ret < 0)
         {
diff --git a/examples/posix_spawn/spawn_main.c b/examples/posix_spawn/spawn_main.c
index 4d5e88cbb..0ef77ed79 100644
--- a/examples/posix_spawn/spawn_main.c
+++ b/examples/posix_spawn/spawn_main.c
@@ -117,16 +117,20 @@ static unsigned int g_mmstep;     /* Memory Usage at beginning of test step */
 static const char delimiter[] =
   "**************************************"
   "**************************************";
-static const char g_redirect[] = "redirect";
 static const char g_data[]     = "testdata.txt";
 
 static char fullpath[128];
 
-static char * const g_argv[5] =
+static char * const g_hello_argv[5] =
 {
   "hello", "Argument 1", "Argument 2", "Argument 3", NULL
 };
 
+static char * const g_redirect_argv[2] =
+{
+  "redirect", NULL
+};
+
 /****************************************************************************
  * Symbols from Auto-Generated Code
  ****************************************************************************/
@@ -270,7 +274,7 @@ int main(int argc, FAR char *argv[])
    * this program from the others.
    */
 
-  testheader(g_argv[0]);
+  testheader(g_hello_argv[0]);
 
   /* Initialize the attributes file actions structure */
 
@@ -299,9 +303,9 @@ int main(int argc, FAR char *argv[])
    */
 
 #ifdef CONFIG_LIB_ENVPATH
-  filepath = g_argv[0];
+  filepath = g_hello_argv[0];
 #else
-  snprintf(fullpath, 128, "%s/%s", MOUNTPT, g_argv[0]);
+  snprintf(fullpath, 128, "%s/%s", MOUNTPT, g_hello_argv[0]);
   filepath = fullpath;
 #endif
 
@@ -309,8 +313,8 @@ int main(int argc, FAR char *argv[])
 
   mm_update(&g_mmstep, "before posix_spawn");
 
-  ret = posix_spawn(&pid, filepath, &file_actions, &attr, NULL,
-                    (FAR char * const *)&g_argv);
+  ret = posix_spawn(&pid, filepath, &file_actions,
+                    &attr, g_hello_argv, NULL);
   if (ret != 0)
     {
       errmsg("ERROR: posix_spawn failed: %d\n", ret);
@@ -347,7 +351,7 @@ int main(int argc, FAR char *argv[])
    * this program from the others.
    */
 
-  testheader(g_redirect);
+  testheader(g_redirect_argv[0]);
 
   /* Initialize the attributes file actions structure */
 
@@ -398,9 +402,9 @@ int main(int argc, FAR char *argv[])
    */
 
 #ifdef CONFIG_LIB_ENVPATH
-  filepath = g_redirect;
+  filepath = g_redirect_argv[0];
 #else
-  snprintf(fullpath, 128, "%s/%s", MOUNTPT, g_redirect);
+  snprintf(fullpath, 128, "%s/%s", MOUNTPT, g_redirect_argv[0]);
   filepath = fullpath;
 #endif
 
@@ -408,7 +412,8 @@ int main(int argc, FAR char *argv[])
 
   mm_update(&g_mmstep, "before posix_spawn");
 
-  ret = posix_spawn(&pid, filepath, &file_actions, &attr, NULL, NULL);
+  ret = posix_spawn(&pid, filepath, &file_actions,
+                    &attr, g_redirect_argv, NULL);
   if (ret != 0)
     {
       errmsg("ERROR: posix_spawn failed: %d\n", ret);