spawn: Allow NULL envp for the current environment

3 files changed, 8 insertions, 2 deletions

diff --git a/exec.c b/exec.c
index bc01808..431fcbe 100644
--- a/exec.c
+++ b/exec.c
@@ -374,7 +374,7 @@ static int bfs_exec_spawn(const struct bfs_exec *execbuf) {
 		}
 	}
 
-	pid = bfs_spawn(execbuf->argv[0], &ctx, execbuf->argv, environ);
+	pid = bfs_spawn(execbuf->argv[0], &ctx, execbuf->argv, NULL);
 fail:
 	error = errno;
 	bfs_spawn_destroy(&ctx);
diff --git a/spawn.c b/spawn.c
index 4879e12..82beca5 100644
--- a/spawn.c
+++ b/spawn.c
@@ -217,6 +217,11 @@ fail:
 }
 
 pid_t bfs_spawn(const char *exe, const struct bfs_spawn *ctx, char **argv, char **envp) {
+	extern char **environ;
+	if (!envp) {
+		envp = environ;
+	}
+
 	// Use a pipe to report errors from the child
 	int pipefd[2];
 	if (pipe_cloexec(pipefd) != 0) {
diff --git a/spawn.h b/spawn.h
index a2c23fd..16815bb 100644
--- a/spawn.h
+++ b/spawn.h
@@ -100,7 +100,8 @@ int bfs_spawn_addsetrlimit(struct bfs_spawn *ctx, int resource, const struct rli
  * @param argv
  *         The arguments for the new process.
  * @param envp
- *         The environment variables for the new process.
+ *         The environment variables for the new process (NULL for the current
+ *         environment.
  * @return
  *         The PID of the new process, or -1 on error.
  */