int __init(int argc, char **argv)
{ int ans;
_error_recursion = 0;
_curbrk = &end;
_ctype_init(); /* init to C locale */
_init_alloc();
_exit_init(); /* must happen before exit() can be called */
_initio(NULL, NULL, NULL);
ans = main(argc, argv, _environ);
while (number_of_exit_functions!=0)
(*_exitvector[--number_of_exit_functions])();
_terminateio();
_syscall1(SYS_exit, ans);
}
extern int system(const char *string)
{
int pid;
void (*s2)(int);
void (*s3)(int);
if ((pid = _vfork()) == 0) {
char *gv[4] = {"sh", "-c", (char*)0, (char*)0};
gv[2] = (char *)string;
_syscall3(SYS_execve, (int)"/bin/sh", (int)gv, (int)_environ);
_syscall1(SYS_exit,127); /* Should not get here!! */
}
s2 = signal(SIGINT, SIG_IGN);
s3 = signal(SIGQUIT, SIG_IGN);
while (1) {
int status;
int wp = _wait(&status);
if (wp == pid || wp == -1) {
signal(SIGINT,s2);
signal(SIGQUIT,s3);
return (wp == -1 ? -1 : status);
}
}
}
//等待子进程，子进程状态存储到status
pid_t wait(int32_t* status){
return _syscall1(SYS_WAIT,status);
}
//以状态status退出
void exit(int32_t status){
_syscall1(SYS_EXIT,status);
}
/* 改变工作目录为path */
int32_t chdir(const char* path) {
return _syscall1(SYS_CHDIR, path);
}
/* 回归目录指针 */
void rewinddir(struct dir* dir) {
_syscall1(SYS_REWINDDIR, dir);
}
/* 读取目录dir */
struct dir_entry* readdir(struct dir* dir) {
return (struct dir_entry*)_syscall1(SYS_READDIR, dir);
}
//释放ptr指向的内存
void free(void* ptr){
_syscall1(SYS_FREE,ptr);
}
/* 打开目录name */
struct dir* opendir(const char* name) {
return (struct dir*)_syscall1(SYS_OPENDIR, name);
}
/* 创建目录pathname */
int32_t mkdir(const char* pathname) {
return _syscall1(SYS_MKDIR, pathname);
}
/* 删除文件pathname */
int32_t unlink(const char* pathname) {
return _syscall1(SYS_UNLINK, pathname);
}
/* 关闭文件fd */
int32_t close(int32_t fd) {
return _syscall1(SYS_CLOSE, fd);
}
uint32_t
wait(int* stat_loc)
{
return _syscall1(SYS_WAIT, (uint32_t)stat_loc);
}
//生成管道，pipefd[0]负责读入管道，pipefd[1]负责写入管道
int32_t pipe(int32_t pipefd[2]){
return _syscall1(SYS_PIPE,pipefd);
}
/* 关闭目录dir */
int32_t closedir(struct dir* dir) {
return _syscall1(SYS_CLOSEDIR, dir);
}
//申请size字节大小的内存，并返回结果
void *malloc(uint32_t size){
return (void*)_syscall1(SYS_MALLOC,size);
}
/* 删除目录pathname */
int32_t rmdir(const char* pathname) {
return _syscall1(SYS_RMDIR, pathname);
}
//输出一个字符
void putchar(char char_asci){
_syscall1(SYS_PUTCHAR,char_asci);
}
int remove(const char *pathname)
{
return _syscall1(SYS_unlink,(int)pathname);
}