Kernel, libc: Add ENOEXEC (Exec format error)

apps/src/init.c

@@ -123,7 +123,7 @@ int main()
 
     sleep(2);
 
-    if (execv("/bin/sym", NULL) < 0)
+    if (execv("/sys/config", NULL) < 0)
     {
         perror("execv");
         return 1;

kernel/include/errno.h

@@ -2,6 +2,7 @@
 
 #define EPERM 1
 #define ENOENT 2
+#define ENOEXEC 8
 #define EBADF 9
 #define ENOMEM 12
 #define EISDIR 21

kernel/src/sys/exec.cpp

@@ -34,7 +34,7 @@ void sys_exec(Context* context, const char* pathname)
 
     if (ELFLoader::check_elf_image(program) < 0)
     {
-        context->rax = -EINVAL; // FIXME: Should be ENOEXEC.
+        context->rax = -ENOEXEC;
         return;
     }
 

libs/libc/include/errno.h

@@ -6,6 +6,7 @@ extern int errno;
 
 #define EPERM 1   // Operation not permitted
 #define ENOENT 2  // No such file or directory
+#define ENOEXEC 8 // Exec format error
 #define EBADF 9   // Bad file descriptor
 #define ENOMEM 12 // Cannot allocate memory
 #define EISDIR 21 // Is a directory

libs/libc/src/string.cpp

@@ -127,6 +127,7 @@ extern "C"
         case EBADF: return "Bad file descriptor";
         case EMFILE: return "Too many open files";
         case EISDIR: return "Is a directory";
+        case ENOEXEC: return "Exec format error";
         case 0: return "Success";
         default: return (char*)(unsigned long int)err;
         }