更好的进程系统

cleonos/c/apps/bg_main.c

@@ -0,0 +1,96 @@
+#include "cmd_runtime.h"
+
+static int ush_cmd_bg(const ush_state *sh, const char *arg) {
+    char target[USH_PATH_MAX];
+    char argv_line[USH_ARG_MAX];
+    char env_line[USH_PATH_MAX + 32ULL];
+    const char *rest = "";
+    char path[USH_PATH_MAX];
+    u64 pid;
+
+    if (sh == (const ush_state *)0 || arg == (const char *)0 || arg[0] == '\0') {
+        ush_writeln("bg: usage bg <path|name> [args...]");
+        return 0;
+    }
+
+    if (ush_split_first_and_rest(arg, target, (u64)sizeof(target), &rest) == 0) {
+        ush_writeln("bg: usage bg <path|name> [args...]");
+        return 0;
+    }
+
+    argv_line[0] = '\0';
+    if (rest != (const char *)0 && rest[0] != '\0') {
+        ush_copy(argv_line, (u64)sizeof(argv_line), rest);
+    }
+
+    if (ush_resolve_exec_path(sh, target, path, (u64)sizeof(path)) == 0) {
+        ush_writeln("bg: invalid target");
+        return 0;
+    }
+
+    if (ush_path_is_under_system(path) != 0) {
+        ush_writeln("bg: /system/*.elf is kernel-mode (KELF), not user-exec");
+        return 0;
+    }
+
+    env_line[0] = '\0';
+    ush_copy(env_line, (u64)sizeof(env_line), "PWD=");
+    ush_copy(env_line + 4, (u64)(sizeof(env_line) - 4ULL), sh->cwd);
+
+    pid = cleonos_sys_spawn_pathv(path, argv_line, env_line);
+
+    if (pid == (u64)-1) {
+        ush_writeln("bg: request failed");
+        return 0;
+    }
+
+    ush_write("[");
+    ush_write_hex_u64(pid);
+    ush_write("] ");
+    ush_writeln(path);
+    return 1;
+}
+
+int cleonos_app_main(void) {
+    ush_cmd_ctx ctx;
+    ush_cmd_ret ret;
+    ush_state sh;
+    char initial_cwd[USH_PATH_MAX];
+    int has_context = 0;
+    int success = 0;
+    const char *arg = "";
+
+    ush_zero(&ctx, (u64)sizeof(ctx));
+    ush_zero(&ret, (u64)sizeof(ret));
+    ush_init_state(&sh);
+    ush_copy(initial_cwd, (u64)sizeof(initial_cwd), sh.cwd);
+
+    if (ush_command_ctx_read(&ctx) != 0) {
+        if (ctx.cmd[0] != '\0' && ush_streq(ctx.cmd, "bg") != 0) {
+            has_context = 1;
+            arg = ctx.arg;
+            if (ctx.cwd[0] == '/') {
+                ush_copy(sh.cwd, (u64)sizeof(sh.cwd), ctx.cwd);
+                ush_copy(initial_cwd, (u64)sizeof(initial_cwd), sh.cwd);
+            }
+        }
+    }
+
+    success = ush_cmd_bg(&sh, arg);
+
+    if (has_context != 0) {
+        if (ush_streq(sh.cwd, initial_cwd) == 0) {
+            ret.flags |= USH_CMD_RET_FLAG_CWD;
+            ush_copy(ret.cwd, (u64)sizeof(ret.cwd), sh.cwd);
+        }
+
+        if (sh.exit_requested != 0) {
+            ret.flags |= USH_CMD_RET_FLAG_EXIT;
+            ret.exit_code = sh.exit_code;
+        }
+
+        (void)ush_command_ret_write(&ret);
+    }
+
+    return (success != 0) ? 0 : 1;
+}