Fix PAL library command arguments not follow convention

demos/embedded_mode/bench_driver/main.c

@@ -58,6 +58,7 @@ int main(int argc, char *argv[]) {
     snprintf(buf_ptr_str, sizeof buf_ptr_str, "%lu", (unsigned long) shared_buf);
     snprintf(buf_size_str, sizeof buf_size_str, "%lu", sizeof shared_buf);
     const char *cmd_args[] = {
+        cmd_path,
         buf_ptr_str, // buf_ptr
         buf_size_str, // buf_size
         total_bytes_str, // total_bytes

src/exec/src/bin/occlum_exec_client.rs

@@ -27,6 +27,7 @@ use signal_hook::iterator::Signals;
 use signal_hook::{SIGINT, SIGKILL, SIGQUIT, SIGTERM, SIGUSR1};
 use std::cmp;
 use std::env;
+use std::path::Path;
 use std::os::unix::net::UnixListener;
 use std::process;
 use std::process::{Command, Stdio};
@@ -297,7 +298,7 @@ fn main() -> Result<(), i32> {
         stop_server(&client, stop_time);
         println!("server stopped.");
     } else if let Some(ref matches) = matches.subcommand_matches("exec") {
-        let cmd_args: Vec<&str> = match matches
+        let mut cmd_args: Vec<&str> = match matches
             .values_of("args")
             .map(|vals| vals.collect::<Vec<_>>())
         {
@@ -306,7 +307,9 @@ fn main() -> Result<(), i32> {
             _ => panic!(),
         };
 
-        let (cmd, args) = cmd_args.split_first().unwrap();
+        let cmd = cmd_args[0];
+        // Change cmd_args[0] from path name to program name
+        cmd_args[0] = Path::new(cmd_args[0]).file_name().unwrap().to_str().unwrap();
         let env: Vec<&str> = env.iter().map(|string| string.as_str()).collect();
 
         // Create the signal handler
@@ -330,7 +333,7 @@ fn main() -> Result<(), i32> {
             }
         });
 
-        match exec_command(&client, cmd, args, &env) {
+        match exec_command(&client, cmd, &cmd_args, &env) {
             Ok(process_id) => {
                 // the signal thread exit if server finished execution or user kill the client
                 signal_thread.join().unwrap();

src/libos/src/entry.rs

@@ -225,18 +225,8 @@ fn parse_arguments(
             .map_err(|e| errno!(EINVAL, "path contains valid utf-8 data"))?;
         Path::new(&path_string).to_path_buf()
     };
-    let program_cstring = {
-        let program_osstr = path_buf
-            .file_name()
-            .ok_or_else(|| errno!(EINVAL, "invalid path"))?;
-        let program_str = program_osstr
-            .to_str()
-            .ok_or_else(|| errno!(EINVAL, "invalid path"))?;
-        CString::new(program_str).map_err(|e| errno!(e))?
-    };
 
     let mut args = clone_cstrings_safely(argv)?;
-    args.insert(0, program_cstring);
 
     let env_merged = merge_env(env)?;
     trace!(

src/pal/include/occlum_pal_api.h

@@ -64,7 +64,8 @@ struct occlum_pal_create_process_args {
 
     // Argments array pass to new process.
     //
-    // The arguments to the command. The array must be NULL terminated.
+    // The arguments to the command. By convention, the argv[0] should be the program name.
+    // And the array must be NULL terminated.
     //
     // Mandatory field. Must not be NULL.
     const char **argv;

src/run/main.c

@@ -2,6 +2,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <string.h>
+#include <libgen.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <occlum_pal_api.h>
@@ -13,10 +15,17 @@ int main(int argc, char *argv[]) {
         fprintf(stderr, "Usage: occlum-run <executable> [<args>]\n");
         return EXIT_FAILURE;
     }
-    const char *cmd_path = (const char *) argv[1];
-    const char **cmd_args = (const char **) &argv[2];
+
+    char **cmd_args = &argv[1];
+    char *cmd_path = strdup(argv[1]);
     extern const char **environ;
 
+    // Change cmd_args[0] from program path to program name in place (e.g., "/bin/abc" to "abc")
+    char *cmd_path_tmp = strdup(cmd_path);
+    const char *program_name = (const char *) basename(cmd_path_tmp);
+    memset(cmd_args[0], 0, strlen(cmd_args[0]));
+    memcpy(cmd_args[0], program_name, strlen(program_name));
+
     // Check Occlum PAL version
     int pal_version = occlum_pal_get_version();
     if (pal_version <= 0) {
@@ -39,8 +48,8 @@ int main(int argc, char *argv[]) {
     int exit_status = 0;
     int libos_tid = 0;
     struct occlum_pal_create_process_args create_process_args = {
-        .path = cmd_path,
-        .argv = cmd_args,
+        .path = (const char *) cmd_path,
+        .argv = (const char **) cmd_args,
         .env = environ,
         .stdio = (const struct occlum_stdio_fds *) &io_fds,
         .pid = &libos_tid,