“Setjump” and “Longjump” are defined in setjmp.h, a header file in C standard library.
- setjump(jmp_buf buf) : uses buf to remember current position and returns 0.
- longjump(jmp_buf buf, i) : Go back to place buf is pointing to and return i .
// A simple C program to demonstrate working of setjmp() and longjmp() #include<stdio.h> #include<setjmp.h> jmp_buf buf; void func() { printf("Welcome to GeeksforGeeks
"); // Jump to the point setup by setjmp longjmp(buf, 1); printf("Geek2
"); } int main() { // Setup jump position using buf and return 0 if (setjmp(buf)) printf("Geek3
"); else { printf("Geek4
"); func(); } return 0; } |
Output :
Geek4 Welcome to GeeksforGeeks Geek3
The main feature of these function is to provide a way that deviates from standard call and return sequence. 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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