signal的发送（暂时父子进程之间共享信号及相应的结构体） (#89)

* 解决由于spinlock.h中包含preempt_enable()带来的循环include问题

* new: 初步实现signal的数据结构

* new:signal相关数据结构

* fix: 解决bindings.rs报一堆警告的问题

* new: rust下的kdebug kinfo kwarn kBUG kerror宏

* 移动asm.h和cmpxchg.h

* new: signal的发送（暂时只支持父子进程共享信号及处理函数）

user/apps/shell/cmd.c

@@ -4,6 +4,7 @@
 #include <libc/dirent.h>
 #include <libc/errno.h>
 #include <libc/fcntl.h>
+#include <libc/include/signal.h>
 #include <libc/stddef.h>
 #include <libc/stdio.h>
 #include <libc/stdlib.h>
@@ -23,7 +24,7 @@ struct built_in_cmd_t shell_cmds[] = {
     {"cd", shell_cmd_cd},         {"cat", shell_cmd_cat},     {"exec", shell_cmd_exec},   {"ls", shell_cmd_ls},
     {"mkdir", shell_cmd_mkdir},   {"pwd", shell_cmd_pwd},     {"rm", shell_cmd_rm},       {"rmdir", shell_cmd_rmdir},
     {"reboot", shell_cmd_reboot}, {"touch", shell_cmd_touch}, {"about", shell_cmd_about}, {"free", shell_cmd_free},
-    {"help", shell_help},         {"pipe", shell_pipe_test},
+    {"help", shell_help},         {"pipe", shell_pipe_test},  {"kill", shell_cmd_kill},
 
 };
 // 总共的内建命令数量
@@ -331,11 +332,14 @@ int shell_cmd_touch(int argc, char **argv)
 {
     int path_len = 0;
     char *file_path;
-    bool alloc_full_path=false;
+    bool alloc_full_path = false;
     if (argv[1][0] == '/')
         file_path = argv[1];
     else
-        {file_path = get_target_filepath(argv[1], &path_len);alloc_full_path=true;}
+    {
+        file_path = get_target_filepath(argv[1], &path_len);
+        alloc_full_path = true;
+    }
 
     // 打开文件
     int fd = open(file_path, O_CREAT);
@@ -351,7 +355,7 @@ int shell_cmd_touch(int argc, char **argv)
     close(fd);
     if (argv != NULL)
         free(argv);
-    if(alloc_full_path)
+    if (alloc_full_path)
         free(file_path);
     return 0;
 }
@@ -425,7 +429,7 @@ int shell_cmd_rmdir(int argc, char **argv)
  */
 int shell_cmd_rm(int argc, char **argv)
 {
-     char *full_path = NULL;
+    char *full_path = NULL;
     int result_path_len = -1;
     int retval = 0;
     bool alloc_full_path = false;
@@ -472,7 +476,7 @@ int shell_cmd_exec(int argc, char **argv)
         execv(file_path, argv);
         free(argv);
         free(file_path);
-        
+
         exit(-1);
     }
     else
@@ -498,7 +502,24 @@ int shell_cmd_about(int argc, char **argv)
 
     parse_command(input_buffer, &aac, &aav);
 
-    shell_cmd_exec(aac, aav);
+    return shell_cmd_exec(aac, aav);
+}
+
+int shell_cmd_kill(int argc, char **argv)
+{
+    int retval = 0;
+    if (argc < 2)
+    {
+        printf("Usage: Kill <pid>\n");
+        retval = -EINVAL;
+        goto out;
+    }
+    printf("argc = %d, argv[1]=%s\n", argc, argv[1]);
+    printf("atoi(argv[1])=%d\n", atoi(argv[1]));
+    retval = syscall_invoke(SYS_KILL, atoi(argv[1]), SIGKILL, 0, 0, 0, 0, 0, 0);
+out:;
+    free(argv);
+    return retval;
 }
 
 /**

user/apps/shell/cmd.h

@@ -149,4 +149,6 @@ int shell_cmd_free(int argc, char **argv);
  * @param argv 返回值：参数列表
  * @return int
  */
-int parse_command(char *buf, int *argc, char ***argv);
+int parse_command(char *buf, int *argc, char ***argv);
+
+int shell_cmd_kill(int argc, char **argv);

user/libs/libc/include/signal.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#define SIGHUP 1
+#define SIGINT 2
+#define SIGQUIT 3
+#define SIGILL 4
+#define SIGTRAP 5
+#define SIGABRT 6
+#define SIGIOT 6
+#define SIGBUS 7
+#define SIGFPE 8
+#define SIGKILL 9
+#define SIGUSR1 10
+#define SIGSEGV 11
+#define SIGUSR2 12
+#define SIGPIPE 13
+#define SIGALRM 14
+#define SIGTERM 15
+#define SIGSTKFLT 16
+#define SIGCHLD 17
+#define SIGCONT 18
+#define SIGSTOP 19
+#define SIGTSTP 20
+#define SIGTTIN 21
+#define SIGTTOU 22
+#define SIGURG 23
+#define SIGXCPU 24
+#define SIGXFSZ 25
+#define SIGVTALRM 26
+#define SIGPROF 27
+#define SIGWINCH 28
+#define SIGIO 29
+#define SIGPOLL SIGIO
+
+#define SIGPWR 30
+#define SIGSYS 31
+
+/* These should not be considered constants from userland.  */
+#define SIGRTMIN 32
+#define SIGRTMAX MAX_SIG_NUM

user/libs/libsystem/syscall.h

@@ -28,6 +28,7 @@
 
 #define SYS_MSTAT 21    // 获取系统的内存状态信息
 #define SYS_UNLINK_AT 22    // 删除文件夹/删除文件链接
+#define SYS_KILL 23 // kill一个进程(向这个进程发出信号)
 
 /**
  * @brief 用户态系统调用函数