void longjmp(jmp_buf env, int val); longjmp()用于恢复由最近一次调用setjmp()时保存到env的状态信息。当它执行完时,程序就象setjmp()刚刚执行完并返回非0值val那样继续执行。包含setjmp()宏调用的函数一定不能已经终止。所有可访问的对象的值都与调用longjmp()时相同,唯一的例外是,那些调用setjmp()宏的函数中...
一个使用setjmp/longjmp从信号中恢复的小例子Unix系统 。这样,程序在收到一个ctrl-c时 将重新启动,而不是退出。 #include s td io.h #include signal.h #include setjmp.h jmp_buf buf; void handler(int sig) { if (sig == SIGINT) printf(Now got a SIGINT signal\n) 下面这个程序使用setjmp/longjmp...
void longjmp(jmp_buf env, int val); 1. longjmp函数的功能是从jmp_buf结构体中恢复由setjmp保存的上下文,该函数不返回,而是从setjmp函数中返回。 参数env 是由 setjmp 函数保存过的上下文; 参数val 表示从 longjmp 函数传递给 setjmp 函数的返回值,如果 val 值为0, setjmp 将会返回1,否则返回 val; longjmp ...
用非局部goto-setjmp和Longjmp函数。非局部的意思是不是由普通C语言goto语句在一个函数内实施的跳转,而是在栈上跳过若干调用帧,返回到当前函数调用路径上的某一函数中。 理解: 例如在第6层嵌套时发现输入了一个无效的数,那么我们就可以用setjmp和longjmpm直接回调到第3层嵌套。而C语言没办法做到这点。 setjmp和...
Single UNIX Specification, Version 3 both Format #include <setjmp.h> int setjmp(jmp_bufenv); General description Saves a stack environment that can subsequently be restored by longjmp(). The setjmp() and longjmp() functions provide a way to perform a nonlocalgoto. They are often used in si...
Single UNIX Specification, Version 3 both Format #include <setjmp.h> int setjmp(jmp_bufenv); General description Saves a stack environment that can subsequently be restored by longjmp(). The setjmp() and longjmp() functions provide a way to perform a nonlocalgoto. They are often used in si...
Single UNIX Specification, Version 3 both Format #include <setjmp.h> int setjmp(jmp_bufenv); General description Saves a stack environment that can subsequently be restored by longjmp(). The setjmp() and longjmp() functions provide a way to perform a nonlocalgoto. They are often used in si...