“Setjump” and “Longjump” are defined in setjmp.h, a header file in C standard library.
- setjump(jmp_buf buf) : uses buf to remember the current position and returns 0.
- longjump(jmp_buf buf, i) : Go back to the place buf is pointing to and return i.
C
// C program to demonstrate // working of setjmp() and // longjmp() #include <setjmp.h> #include <stdio.h> jmp_buf buf;
void func()
{ printf ( "Welcome to GeeksforGeeks\n" );
// Jump to the point setup by setjmp
longjmp (buf, 1);
printf ( "Geek2\n" );
} int main()
{ // Setup jump position using buf and return 0
if ( setjmp (buf))
printf ( "Geek3\n" );
else {
printf ( "Geek4\n" );
func();
}
return 0;
} |
Output
Geek4 Welcome to GeeksforGeeks Geek3
The main feature of these functions is to provide a way that deviates from standard call and return sequences. This is mainly used to implement exception handling in C. setjmp can be used like try (in languages like C++ and Java). The call to longjmp can be used like throw (Note that longjmp() transfers control to the point set by setjmp()).
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