Questions tagged [setjmp]
Anything related to the setjmp() and longjmp() routines in the C standard library (provided by the setjmp.h header file), which provide control flow that modify the usual call and return sequence of a subroutine.
setjmp
181
questions
3
votes
1
answer
127
views
Primes using setjmp
I wrote a simple Haskell function, that gives a list of primes.
primes' :: [Int] -> [Int]
primes' (p : xs) = p : primes' (filter (\x -> x `rem` p /= 0) xs)
primes :: [Int]
primes = primes' [2 .....
- 71
0
votes
2
answers
103
views
using setjmp/longjmp to time-slice tasks using a timer on ESP32S3 bare-metal
I have implemented in C a round-robin scheduler that cycles through 3 tasks. I want to time-slice my tasks, meaning that when a task takes more than a pre-determined timeout value x, it is interrupted ...
- 1
2
votes
1
answer
59
views
exception handler with siglongjmp interrupting I/O
While working on the homework problem 8.25 in CSAPP, I referred to its solution available at https://dreamanddead.github.io/CSAPP-3e-Solutions/. The provided solution includes the following C code:
#...
- 43
4
votes
1
answer
172
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setjmp/longjmp in C++: Is this undefined behaviour?
Does the following code invoke undefined behaviour:
#include <iostream>
#include <csetjmp>
jmp_buf buffer1;
jmp_buf buffer2;
class Test
{
public:
~Test()
{
...
- 1,831
1
vote
1
answer
175
views
How to free the call stack in C?
I have created a calculator using RDP (recursive descent parser) to parse and evaluate mathematical expressions "such as: 5cos(30) -5(3+5)". The thing is I also have tried to include ...
- 19
3
votes
2
answers
138
views
Implement setjmp and longjmp functionality with ucontext
I am trying to grasp some key concepts in order to fully understand the ucontext and setjmp libraries.
On what concerns ucontext:
User context, eg program counter and stack register.
Is saved on a ...
- 51
1
vote
0
answers
66
views
Common Lisp CFFI setjmp/longjmp
I am calling functions in the MuPDF C library using Common Lisp and CFFI. MuPDF uses setjmp/longjmp for exception handling. The MuPDF website states:
All functions you call should be guarded by a ...
- 93
1
vote
1
answer
98
views
How to know if my signal handler is interrupting an async-signal-unsafe function?
According to this answer, I can only longjmp() out of a signal handler if it is not calling an async-signal-unsafe function. Is there a reliable way to know, from inside the signal handler, if the ...
- 13.2k
1
vote
0
answers
33
views
Why can't I use value = = setjmp(env); [duplicate]
Recently while reading csapp, I find in nonlocal jump, I can't use
int value;
value = setjmp(env);
but I can use this
if(setjmp(env)){
// code
}
Why?
int value;
value = setjmp(env);
- 11
4
votes
1
answer
825
views
How do I ensure the `SIGINT` signal handler is called as many times as `Ctrl+C` is pressed (with `longjmp`)?
Setup
In the code below, which simply prints some text until it times out, I added a handler (onintr()) for SIGINT. The handler onintr() does the following:
Resets itself as the default handler.
...
- 704
2
votes
1
answer
82
views
Using the setjmp and longjmp
Having such a simple C code
#include <stdio.h>
#include <setjmp.h>
void Com_Error(int);
jmp_buf abortframe;
int main() {
if (setjmp (abortframe)){
printf("...
- 136
3
votes
3
answers
822
views
Special treatment of setjmp/longjmp by compilers
In Why volatile works for setjmp/longjmp, user greggo comments:
Actually modern C compilers do need to know that setjmp is a special
case, since there are, in general, optimizations where the change ...
- 59.6k
1
vote
2
answers
143
views
Does setjmp literally save the state of the program?
So, if I were to malloc 500 bytes, then use setjmp to save the state, then free the 500 bytes, then longjmp, would I be able to access those 500 bytes? For example:
#include <stdio.h>
#include &...
- 77
4
votes
4
answers
915
views
Using setjmp and longjmp with a local jmp_buf
In the case that a local jmp_buf is actually represented by registers rather than stack memory, is it possible for setjmp or longjmp to cause the contents of the local jmp_buf to be indeterminate when ...
- 70k
0
votes
1
answer
156
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setjmp / longjmp does not jump where I think it should
I would like to understand how setjmp / longjmp works, so I created an example program, where routineA prints even, routineB prints odd numbers and they jump to each other with longjmp:
#include <...
- 3,727