fx.diagnostics: process: implement environment management

2026-07-12 22:14:57 +01:00
parent 5c837abc6c
commit e9a1bfbde2
3 changed files with 230 additions and 26 deletions
@@ -1,6 +1,7 @@
 #ifndef FX_DIAGNOSTICS_PROCESS_H_
 #define FX_DIAGNOSTICS_PROCESS_H_

+#include <fx/collections/array.h>
 #include <fx/collections/hashtable.h>
 #include <fx/macros.h>
 #include <fx/stream.h>
@@ -17,8 +18,7 @@ FX_TYPE_CLASS_DECLARATION_END(fx_process)
 typedef struct fx_process_start_info {
 	bool proc_redirect_stdin, proc_redirect_stdout, proc_redirect_stderr;
 	const char *proc_file_name;
-	const char **proc_args;
-	size_t proc_args_count;
+	const fx_array *proc_args;
 	const fx_hashtable *proc_environment;
 } fx_process_start_info;

@@ -1,13 +1,22 @@
+#define _POSIX_C_SOURCE 200809L
+
 #include <fx/collections/array.h>
 #include <fx/diagnostics/process.h>
+#include <fx/global.h>
+#include <fx/io/path.h>
 #include <fx/io/pipe.h>
 #include <fx/io/stream.h>
 #include <fx/iterator.h>
 #include <fx/macros.h>
 #include <fx/string.h>
 #include <signal.h>
+#include <sys/wait.h>
 #include <unistd.h>

+static fx_process *self = NULL;
+
+extern const char **environ;
+
 FX_API fx_type_id fx_process_iterator_get_type();

 FX_DECLARE_TYPE(fx_process_iterator);
@@ -21,6 +30,7 @@ struct fx_process_p {
 	bool proc_redirect_stdin, proc_redirect_stdout, proc_redirect_stderr;
 	fx_stream *proc_stdin, *proc_stdout, *proc_stderr;
 	pid_t proc_id;
+	fx_hashtable *proc_environment;
 };

 struct fx_process_iterator_p {
@@ -28,12 +38,109 @@ struct fx_process_iterator_p {

 /*** PRIVATE FUNCTIONS ********************************************************/

+static bool exec_name_is_path(const char *s)
+{
+	fx_wchar c;
+	while (*s) {
+		c = fx_wchar_utf8_codepoint_decode(s);
+		if (c == FX_WCHAR_INVALID) {
+			break;
+		}
+
+		if (c == '/') {
+			return true;
+		}
+
+		s += fx_wchar_utf8_codepoint_stride(s);
+	}
+
+	return false;
+}
+
+const fx_string *get_path(void)
+{
+	const char *path_env = NULL;
+	fx_process *self = fx_process_get_self();
+	if (!self) {
+		goto fallback;
+	}
+
+	const fx_hashtable *env = fx_process_get_environment(self);
+	if (!env) {
+		goto fallback;
+	}
+
+	const fx_value *path_v = fx_hashtable_get(env, &FX_CSTR("PATH"));
+	if (!path_v) {
+		goto fallback;
+	}
+
+	fx_string *result = NULL;
+	fx_value_get_object(path_v, &result);
+	return result;
+
+fallback:
+	path_env = getenv("PATH");
+	if (!path_env) {
+		return NULL;
+	}
+
+	return fx_string_create_from_cstr(path_env);
+}
+
+static fx_status find_executable(fx_string *exec_path)
+{
+	const char *exec_path_cstr = fx_string_get_cstr(exec_path);
+	const fx_string *path_env = get_path();
+	if (!path_env) {
+		return FX_ERR_NO_ENTRY;
+	}
+
+	const char *delim[] = {":"};
+	size_t nr_delim = sizeof delim / sizeof delim[0];
+	fx_path *path = NULL;
+	fx_iterator *it = fx_string_tokenise(
+		path_env,
+		delim,
+		nr_delim,
+		FX_STRING_TOK_F_NORMAL);
+	fx_status status = FX_ERR_NO_ENTRY;
+
+	fx_foreach(tok, it)
+	{
+		path = fx_path_join_list(2, tok, &FX_VALUE_OBJECT(exec_path));
+		if (fx_path_is_file(path)) {
+			fx_string_clear(exec_path);
+			fx_string_append_cstr(
+				exec_path,
+				fx_path_get_cstr(path));
+			status = FX_SUCCESS;
+			break;
+		}
+	}
+
+	fx_iterator_unref(it);
+	fx_path_unref(path);
+
+	return status;
+}
+
 static fx_status process_start(struct fx_process_p *proc)
 {
 	fx_iostream *in_r = NULL, *in_w = NULL;
 	fx_iostream *out_r = NULL, *out_w = NULL;
 	fx_iostream *err_r = NULL, *err_w = NULL;
 	fx_status status = FX_SUCCESS;
+	bool name_is_path
+		= exec_name_is_path(fx_string_get_cstr(proc->proc_exec_path));
+
+	if (!name_is_path) {
+		status = find_executable(proc->proc_exec_path);
+	}
+
+	if (!FX_OK(status)) {
+		return status;
+	}

 	if (proc->proc_redirect_stdin) {
 		status = fx_pipe_create(&in_r, &in_w);
@@ -76,7 +183,6 @@ static fx_status process_start(struct fx_process_p *proc)
 	if (proc->proc_redirect_stdin) {
 		fx_iostream_unref(in_w);
 		fd = fx_iostream_steal_os_handle(in_r);
-		fprintf(stderr, "dup2(%d, %d)\n", fd, 0);
 		int err = dup2(fd, 0);
 		close(fd);
 	}
@@ -96,12 +202,23 @@ static fx_status process_start(struct fx_process_p *proc)
 	}

 	const char **argv = NULL;
+	const char **envp = NULL;
+	const char *default_argv[] = {
+		fx_string_get_cstr(proc->proc_exec_path),
+		NULL,
+	};
+
 	size_t argc = 0;
+	size_t envc = 0;

 	if (proc->proc_args) {
 		argc = fx_array_get_size(proc->proc_args);
 	}

+	if (proc->proc_environment) {
+		envc = fx_hashtable_get_count(proc->proc_environment);
+	}
+
 	if (argc) {
 		argv = calloc(argc + 1, sizeof(char *));

@@ -110,9 +227,38 @@ static fx_status process_start(struct fx_process_p *proc)
 				= fx_array_get_ref(proc->proc_args, i);
 			fx_value_get_cstr(arg_value, &argv[i]);
 		}
+	} else {
+		argv = default_argv;
 	}

-	execv(fx_string_get_cstr(proc->proc_exec_path), (char *const *)argv);
+	if (envc) {
+		envp = calloc(envc + 1, sizeof(char *));
+		size_t i = 0;
+		fx_stringstream *tmp = fx_stringstream_create();
+		const fx_iterator *it
+			= fx_iterator_begin(proc->proc_environment);
+		fx_foreach(v, it)
+		{
+			fx_hashtable_item *item = NULL;
+			fx_value_get_object(v, &item);
+			const fx_value *name_v
+				= fx_hashtable_item_get_key(item);
+			const fx_value *value_v
+				= fx_hashtable_item_get_value(item);
+
+			fx_value_to_string(name_v, tmp, NULL);
+			fx_stream_write_char(tmp, '=');
+			fx_value_to_string(value_v, tmp, NULL);
+			envp[i++] = fx_stringstream_steal(tmp);
+		}
+
+		fx_iterator_unref(it);
+		fx_string_unref(tmp);
+	}
+
+	execve(fx_string_get_cstr(proc->proc_exec_path),
+	       (char *const *)argv,
+	       (char *const *)envp);
 	exit(127);

 cleanup:
@@ -159,6 +305,12 @@ static fx_status process_kill(struct fx_process_p *proc)
 	return FX_SUCCESS;
 }

+static const fx_hashtable *process_get_environment(
+	const struct fx_process_p *proc)
+{
+	return proc->proc_environment;
+}
+
 static fx_stream *process_get_stdin(struct fx_process_p *proc)
 {
 	return proc->proc_stdin;
@@ -210,25 +362,10 @@ fx_process *fx_process_create(const fx_process_start_info *info)
 		return NULL;
 	}

-	if (info->proc_args_count > 0) {
-		proc->proc_args = fx_array_create();
-		if (!proc->proc_args) {
-			fx_process_unref(out);
-			return NULL;
-		}
-	}
-
-	for (size_t i = 0; i < info->proc_args_count; i++) {
-		fx_string *arg = fx_string_create_from_cstr(info->proc_args[i]);
-		if (!arg) {
-			fx_process_unref(out);
-			return NULL;
-		}
-
-		fx_array_push_back(proc->proc_args, FX_VALUE_OBJECT(arg));
-		fx_string_unref(arg);
-	}
+	proc->proc_args = fx_array_ref((fx_array *)info->proc_args);

+	proc->proc_environment
+		= fx_hashtable_ref((fx_hashtable *)info->proc_environment);
 	proc->proc_redirect_stdin = info->proc_redirect_stdin;
 	proc->proc_redirect_stdout = info->proc_redirect_stdout;
 	proc->proc_redirect_stderr = info->proc_redirect_stderr;
@@ -236,6 +373,56 @@ fx_process *fx_process_create(const fx_process_start_info *info)
 	return out;
 }

+fx_process *fx_process_get_self(void)
+{
+	if (self) {
+		return self;
+	}
+
+	self = fx_object_create(FX_DIAGNOSTICS_TYPE_PROCESS);
+	if (!self) {
+		return NULL;
+	}
+
+	struct fx_process_p *proc
+		= fx_object_get_private(self, FX_DIAGNOSTICS_TYPE_PROCESS);
+
+	proc->proc_id = getpid();
+	fx_hashtable *env = fx_hashtable_create();
+
+	for (size_t i = 0; environ[i]; i++) {
+		char *envstr = fx_strdup(environ[i]);
+
+		const char *name = envstr;
+		char *sep = strchr(name, '=');
+		const char *value = NULL;
+		if (sep) {
+			*sep = '\0';
+			value = sep + 1;
+		}
+
+		fx_string *name_str = fx_string_create_from_cstr(name);
+		fx_string *value_str = fx_string_create();
+		if (value) {
+			fx_string_append_cstr(value_str, value);
+		}
+
+		fx_hashtable_put(
+			env,
+			&FX_VALUE_OBJECT(name_str),
+			&FX_VALUE_OBJECT(value_str));
+
+		fx_string_unref(name_str);
+		fx_string_unref(value_str);
+		free(envstr);
+	}
+
+	proc->proc_environment = env;
+
+	fx_register_global(self);
+	return self;
+}
+
 fx_status fx_process_start(fx_process *proc)
 {
 	FX_CLASS_DISPATCH_STATIC_0(
@@ -261,6 +448,14 @@ fx_status fx_process_kill(fx_process *proc)
 		proc);
 }

+const fx_hashtable *fx_process_get_environment(const fx_process *proc)
+{
+	FX_CLASS_DISPATCH_STATIC_0(
+		FX_DIAGNOSTICS_TYPE_PROCESS,
+		process_get_environment,
+		proc);
+}
+
 fx_stream *fx_process_get_stdin(fx_process *proc)
 {
 	FX_CLASS_DISPATCH_STATIC_0(
@@ -317,6 +512,13 @@ static void process_init(fx_object *obj, void *priv)

 static void process_fini(fx_object *obj, void *priv)
 {
+	struct fx_process_p *proc = priv;
+	fx_array_unref(proc->proc_args);
+	fx_iostream_unref(proc->proc_stdin);
+	fx_iostream_unref(proc->proc_stdout);
+	fx_iostream_unref(proc->proc_stderr);
+	fx_string_unref(proc->proc_exec_path);
+	fx_hashtable_unref(proc->proc_environment);
 }

 /*** ITERATOR DEFINITION ******************************************************/
@@ -9,17 +9,19 @@ int main(int argc, const char **argv)
 	const char *exec = argv[1];
 	const char *msg = argv[2];

-	const char *args[] = {
-		"hello",
-		"world",
+	const fx_value arg_values[] = {
+		FX_CSTR("hello"),
+		FX_CSTR("world"),
 	};
+	fx_array *args = fx_array_create_with_values(
+		arg_values,
+		sizeof arg_values / sizeof arg_values[0]);

 	fx_process *self = fx_process_get_self();
 	const fx_hashtable *env = fx_process_get_environment(self);

 	fx_process_start_info info = {
 		.proc_args = args,
-		.proc_args_count = sizeof args / sizeof args[0],
 		.proc_redirect_stdout = true,
 		.proc_redirect_stdin = true,
 		.proc_file_name = exec,