A data type used by the `setjmp` and `longjmp` functions to store information about the program’s environment, including the stack, register states, and instruction pointer, allowing for non-local jumps in program execution.
1st Parameter
A buffer of type `jmp_buf` used to store the program’s environment at the point of the call for later restoration by `longjmp`.
Read more about parameters of setjmp in parameters section
The setjmpfunction in C language Saves the calling environment for longjmp.
The setjmp function saves the current execution context into the jmp_buf argument. It's used in conjunction with longjmp to implement non-local jumps. When setjmp is initially called, it returns 0. If longjmp is later called with this jmp_buf, execution returns to the point of the setjmp call, and setjmp returns the value passed to longjmp.
The setjmpfunction takes 1
parameter:
•
jmp_buf `env`: A buffer of type `jmp_buf` used to store the program’s environment at the point of the call for later restoration by `longjmp`.
Saves the program's current execution state, including the stack pointer, program counter, and registers, into the `jmp_buf` provided in `env`. Returns `0` when returning directly from the `setjmp` call and a nonzero value when returning via `longjmp`.
The setjmp function return value :
Returns 0 if returning directly, and a non-zero value if returning from a call to longjmp
Output
This example demonstrates the basic usage of setjmp and longjmp. The setjmp call saves the context, and longjmp later returns to that point.