Trap command from C program? [duplicate]
This question already has an answer here:
Catch Ctrl-C in C
9 answers
I'd like to run a trap '' 2 command from a C program to prevent ctrl-c when the a.out is run.
#define TRAP "trap '' 2"
int main()
{
system(TRAP);
...
}
I can get it to work from a .sh file that also runs the program but I'd like everything to be in one .c file.
trap '' 2
cd /Users/me
./a.out
I then tried to make another .c file that runs the script then launch the first a.out as I thought that it was a timing issue the first time without success either...
How can I get it to work within a single a.out or is that even possible?
c shell trap
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
marked as duplicate by Antti Haapala c
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Dec 29 '18 at 12:05
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
Catch Ctrl-C in C
9 answers
I'd like to run a trap '' 2 command from a C program to prevent ctrl-c when the a.out is run.
#define TRAP "trap '' 2"
int main()
{
system(TRAP);
...
}
I can get it to work from a .sh file that also runs the program but I'd like everything to be in one .c file.
trap '' 2
cd /Users/me
./a.out
I then tried to make another .c file that runs the script then launch the first a.out as I thought that it was a timing issue the first time without success either...
How can I get it to work within a single a.out or is that even possible?
c shell trap
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
marked as duplicate by Antti Haapala c
Users with the c badge can single-handedly close c questions as duplicates and reopen them as needed.
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Dec 29 '18 at 12:05
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
3
Thetrapcommand is built into the shell itself, and only affects the currently running shell, and no other process. If you want to preventCtrl-Cfrom breaking your program (usually a bad idea) then look into signals andSIGBREAK.
– Some programmer dude
Dec 29 '18 at 10:49
add a comment |
This question already has an answer here:
Catch Ctrl-C in C
9 answers
I'd like to run a trap '' 2 command from a C program to prevent ctrl-c when the a.out is run.
#define TRAP "trap '' 2"
int main()
{
system(TRAP);
...
}
I can get it to work from a .sh file that also runs the program but I'd like everything to be in one .c file.
trap '' 2
cd /Users/me
./a.out
I then tried to make another .c file that runs the script then launch the first a.out as I thought that it was a timing issue the first time without success either...
How can I get it to work within a single a.out or is that even possible?
c shell trap
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
This question already has an answer here:
Catch Ctrl-C in C
9 answers
I'd like to run a trap '' 2 command from a C program to prevent ctrl-c when the a.out is run.
#define TRAP "trap '' 2"
int main()
{
system(TRAP);
...
}
I can get it to work from a .sh file that also runs the program but I'd like everything to be in one .c file.
trap '' 2
cd /Users/me
./a.out
I then tried to make another .c file that runs the script then launch the first a.out as I thought that it was a timing issue the first time without success either...
How can I get it to work within a single a.out or is that even possible?
This question already has an answer here:
Catch Ctrl-C in C
9 answers
c shell trap
c shell trap
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
asked Dec 29 '18 at 10:44
Wizzardzz Wizzardzz
353215
353215
marked as duplicate by Antti Haapala c
Users with the c badge can single-handedly close c questions as duplicates and reopen them as needed.
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Dec 29 '18 at 12:05
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Antti Haapala c
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Dec 29 '18 at 12:05
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
3
Thetrapcommand is built into the shell itself, and only affects the currently running shell, and no other process. If you want to preventCtrl-Cfrom breaking your program (usually a bad idea) then look into signals andSIGBREAK.
– Some programmer dude
Dec 29 '18 at 10:49
add a comment |
3
Thetrapcommand is built into the shell itself, and only affects the currently running shell, and no other process. If you want to preventCtrl-Cfrom breaking your program (usually a bad idea) then look into signals andSIGBREAK.
– Some programmer dude
Dec 29 '18 at 10:49
3
3
The
trap command is built into the shell itself, and only affects the currently running shell, and no other process. If you want to prevent Ctrl-C from breaking your program (usually a bad idea) then look into signals and SIGBREAK.– Some programmer dude
Dec 29 '18 at 10:49
The
trap command is built into the shell itself, and only affects the currently running shell, and no other process. If you want to prevent Ctrl-C from breaking your program (usually a bad idea) then look into signals and SIGBREAK.– Some programmer dude
Dec 29 '18 at 10:49
add a comment |
1 Answer
1
active
oldest
votes
trap '' INT ignores SIGINT. Ignore dispositions are inherited to child processes, so:
trap '' 2
cd /Users/me
./a.out
ignores SIGINT for what follows, but it can't work up the process hierarchy.
Fortunately it's not super difficult to ignore SIGINT from C.
#include <signal.h>
int main()
{
//....
signal(SIGINT,SIG_IGN); // `trap '' INT` in C
//^should never fail unless the args are buggy
//...
}
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
trap '' INT ignores SIGINT. Ignore dispositions are inherited to child processes, so:
trap '' 2
cd /Users/me
./a.out
ignores SIGINT for what follows, but it can't work up the process hierarchy.
Fortunately it's not super difficult to ignore SIGINT from C.
#include <signal.h>
int main()
{
//....
signal(SIGINT,SIG_IGN); // `trap '' INT` in C
//^should never fail unless the args are buggy
//...
}
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
add a comment |
trap '' INT ignores SIGINT. Ignore dispositions are inherited to child processes, so:
trap '' 2
cd /Users/me
./a.out
ignores SIGINT for what follows, but it can't work up the process hierarchy.
Fortunately it's not super difficult to ignore SIGINT from C.
#include <signal.h>
int main()
{
//....
signal(SIGINT,SIG_IGN); // `trap '' INT` in C
//^should never fail unless the args are buggy
//...
}
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
add a comment |
trap '' INT ignores SIGINT. Ignore dispositions are inherited to child processes, so:
trap '' 2
cd /Users/me
./a.out
ignores SIGINT for what follows, but it can't work up the process hierarchy.
Fortunately it's not super difficult to ignore SIGINT from C.
#include <signal.h>
int main()
{
//....
signal(SIGINT,SIG_IGN); // `trap '' INT` in C
//^should never fail unless the args are buggy
//...
}
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
trap '' INT ignores SIGINT. Ignore dispositions are inherited to child processes, so:
trap '' 2
cd /Users/me
./a.out
ignores SIGINT for what follows, but it can't work up the process hierarchy.
Fortunately it's not super difficult to ignore SIGINT from C.
#include <signal.h>
int main()
{
//....
signal(SIGINT,SIG_IGN); // `trap '' INT` in C
//^should never fail unless the args are buggy
//...
}
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
answered Dec 29 '18 at 10:55
PSkocikPSkocik
32.6k64870
32.6k64870
add a comment |
add a comment |
3
The
trapcommand is built into the shell itself, and only affects the currently running shell, and no other process. If you want to preventCtrl-Cfrom breaking your program (usually a bad idea) then look into signals andSIGBREAK.– Some programmer dude
Dec 29 '18 at 10:49