C library functions - longjmp ()

C standard library - <setjmp.h>

description

C library functionsvoid longjmp (jmp_buf environment, int value ) to restore a recent call to setjmp ()macro to save the environment by settingjmp_bufparameters before calling setjmp () generates.

statement

Here is the longjmp () function's declaration.

void longjmp(jmp_buf environment, int value)

parameter

• environment - this is a type of jmp_bufobject that contains information about the environment when you call setjmp store.
• value - This is the setjmpexpression to determine value.

return value

This function does not return a value.

Examples

The following example demonstrates the use of longjmp () function.

#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>

int main()
{
   int val;
   jmp_buf env_buffer;

   /* 保存 longjmp 的调用环境 */
   val = setjmp( env_buffer );
   if( val != 0 ) 
   {
      printf("从 longjmp() 返回值 = %s\n", val);
      exit(0);
   }
   printf("跳转函数调用\n");
   jmpfunction( env_buffer );
   
   return(0);
}

void jmpfunction(jmp_buf env_buf)
{
   longjmp(env_buf, "w3cschool.cc");
}

Let's compile and run the above program, which will result in the following:

跳转函数调用
从 longjmp() 返回值 = w3cschool.cc

C standard library - <setjmp.h>