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How can a C program poll for user input while simultaneously performing other actions in a Linux environment?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Data science time! April 2019 and salary with experience
The Ask Question Wizard is Live!How do I prompt for Yes/No/Cancel input in a Linux shell script?How can I use grep to show just filenames on Linux?reading input with fgets(goes into endless loop)C - how to handle user input in a while loopHow to interrupt loop/process using terminal input in C++ on a Linux applicationDealing with user input on linuxHow to scan for input while looping (C Program)How to use fgets() to control the execution of while loop through user input in c?Stopping Linux console from echoing input during program executionHow can I poll keyboard input in c?
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Background:
I'm a relatively inexperienced developer trying to write software to interface with a PCI motion controller. I'm using C (compiled with gcc) on Ubuntu Linux 18.04.
The program I'm writing needs to regularly check for unsolicited status messages sent by the motion controller (approx. once per second) and display any messages it finds on a terminal screen (for which I'm using the ncurses
library).
What I have:
Right now, to do this, I'm calling a function that checks for unsolicited messages in a while loop. The code is roughly akin to:
while (1)
// check for messages from PCI and store them in a traffic buffer
checkForMessages(PCIconnection, trafficBuffer);
// output the traffic buffer to the screen
printf("%s", trafficBuffer);
What I need:
I need the user to be prompted for input in a way that allows them to end the loop. For example, the user could input end
causing the loop to stop and the program to continue.
The problem:
I'm not aware of a way to achieve this without putting fgets
inside the while loop, causing the program to stop and wait for the user to input something on every loop iteration.
I've looked for a solution, but I haven't been able to find discussion on how to achieve the functionality I need. Opening a new thread or process seems like a step in the right direction?
I'm open to completely restructuring my code if what I'm currently doing is poor practice.
Thank you for any help!
c linux
add a comment |
Background:
I'm a relatively inexperienced developer trying to write software to interface with a PCI motion controller. I'm using C (compiled with gcc) on Ubuntu Linux 18.04.
The program I'm writing needs to regularly check for unsolicited status messages sent by the motion controller (approx. once per second) and display any messages it finds on a terminal screen (for which I'm using the ncurses
library).
What I have:
Right now, to do this, I'm calling a function that checks for unsolicited messages in a while loop. The code is roughly akin to:
while (1)
// check for messages from PCI and store them in a traffic buffer
checkForMessages(PCIconnection, trafficBuffer);
// output the traffic buffer to the screen
printf("%s", trafficBuffer);
What I need:
I need the user to be prompted for input in a way that allows them to end the loop. For example, the user could input end
causing the loop to stop and the program to continue.
The problem:
I'm not aware of a way to achieve this without putting fgets
inside the while loop, causing the program to stop and wait for the user to input something on every loop iteration.
I've looked for a solution, but I haven't been able to find discussion on how to achieve the functionality I need. Opening a new thread or process seems like a step in the right direction?
I'm open to completely restructuring my code if what I'm currently doing is poor practice.
Thank you for any help!
c linux
add a comment |
Background:
I'm a relatively inexperienced developer trying to write software to interface with a PCI motion controller. I'm using C (compiled with gcc) on Ubuntu Linux 18.04.
The program I'm writing needs to regularly check for unsolicited status messages sent by the motion controller (approx. once per second) and display any messages it finds on a terminal screen (for which I'm using the ncurses
library).
What I have:
Right now, to do this, I'm calling a function that checks for unsolicited messages in a while loop. The code is roughly akin to:
while (1)
// check for messages from PCI and store them in a traffic buffer
checkForMessages(PCIconnection, trafficBuffer);
// output the traffic buffer to the screen
printf("%s", trafficBuffer);
What I need:
I need the user to be prompted for input in a way that allows them to end the loop. For example, the user could input end
causing the loop to stop and the program to continue.
The problem:
I'm not aware of a way to achieve this without putting fgets
inside the while loop, causing the program to stop and wait for the user to input something on every loop iteration.
I've looked for a solution, but I haven't been able to find discussion on how to achieve the functionality I need. Opening a new thread or process seems like a step in the right direction?
I'm open to completely restructuring my code if what I'm currently doing is poor practice.
Thank you for any help!
c linux
Background:
I'm a relatively inexperienced developer trying to write software to interface with a PCI motion controller. I'm using C (compiled with gcc) on Ubuntu Linux 18.04.
The program I'm writing needs to regularly check for unsolicited status messages sent by the motion controller (approx. once per second) and display any messages it finds on a terminal screen (for which I'm using the ncurses
library).
What I have:
Right now, to do this, I'm calling a function that checks for unsolicited messages in a while loop. The code is roughly akin to:
while (1)
// check for messages from PCI and store them in a traffic buffer
checkForMessages(PCIconnection, trafficBuffer);
// output the traffic buffer to the screen
printf("%s", trafficBuffer);
What I need:
I need the user to be prompted for input in a way that allows them to end the loop. For example, the user could input end
causing the loop to stop and the program to continue.
The problem:
I'm not aware of a way to achieve this without putting fgets
inside the while loop, causing the program to stop and wait for the user to input something on every loop iteration.
I've looked for a solution, but I haven't been able to find discussion on how to achieve the functionality I need. Opening a new thread or process seems like a step in the right direction?
I'm open to completely restructuring my code if what I'm currently doing is poor practice.
Thank you for any help!
c linux
c linux
asked Apr 12 at 23:30
josephsturmjosephsturm
635
635
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
Your task requires an event loop based on select
or epoll
. One event it would wait for is user input - when STDIN_FILENO
becomes ready for read. Another is the 1-second periodic timer when you need to poll the controller.
There are quite a few libraries that implement an event loop for you so that you can focus on what events you need to handle and how. libevent
is one of the oldest, feature rich and popular.
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built intoncurses
itself. Calling the functiontimeout
and passing it0
makesgetch
(anncurses
input function) non-blocking, which also solved my problem.
– josephsturm
Apr 13 at 5:38
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.
– Guntram Blohm
Apr 13 at 7:24
add a comment |
I believe that the "Unix" way would be not to ask for user input, but to react to a user signal. For example, when the user presses Ctrl-C, the currently running process receives SIGINT.
An example how to properly use SIGINT to interrupt a loop can be found here. Copying it into the answer in case the link gets stale:
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static volatile sig_atomic_t got_signal = 0;
static void my_sig_handler(int signo)
got_signal = 1;
int main()
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = &my_sig_handler;
if (sigaction(SIGINT, &sa, NULL) == -1)
perror("sigaction");
return EXIT_FAILURE;
for (;;)
if (got_signal)
got_signal = 0;
printf("Received interrupt signal!n");
printf("Doing useful stuff...n");
sleep(1); /* Sleep is not only useful, it is essential! */
return EXIT_SUCCESS;
(in your case it would be a good idea to put break;
into the if
block or to use while(!got_signal)
)
add a comment |
Simple answer is multi-threading, where you have thread deployed to wait for user input, while loop continues on. So have this:
char flag = 1;
while (flag)
// run the loop
// if thing happens deploy the thread which will ask user for input
I have not done threading in a while, I think this page would be better than me trying to explain it to you:
https://randu.org/tutorials/threads/
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing listaccu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.
– David C. Rankin
Apr 13 at 1:39
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your task requires an event loop based on select
or epoll
. One event it would wait for is user input - when STDIN_FILENO
becomes ready for read. Another is the 1-second periodic timer when you need to poll the controller.
There are quite a few libraries that implement an event loop for you so that you can focus on what events you need to handle and how. libevent
is one of the oldest, feature rich and popular.
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built intoncurses
itself. Calling the functiontimeout
and passing it0
makesgetch
(anncurses
input function) non-blocking, which also solved my problem.
– josephsturm
Apr 13 at 5:38
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.
– Guntram Blohm
Apr 13 at 7:24
add a comment |
Your task requires an event loop based on select
or epoll
. One event it would wait for is user input - when STDIN_FILENO
becomes ready for read. Another is the 1-second periodic timer when you need to poll the controller.
There are quite a few libraries that implement an event loop for you so that you can focus on what events you need to handle and how. libevent
is one of the oldest, feature rich and popular.
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built intoncurses
itself. Calling the functiontimeout
and passing it0
makesgetch
(anncurses
input function) non-blocking, which also solved my problem.
– josephsturm
Apr 13 at 5:38
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.
– Guntram Blohm
Apr 13 at 7:24
add a comment |
Your task requires an event loop based on select
or epoll
. One event it would wait for is user input - when STDIN_FILENO
becomes ready for read. Another is the 1-second periodic timer when you need to poll the controller.
There are quite a few libraries that implement an event loop for you so that you can focus on what events you need to handle and how. libevent
is one of the oldest, feature rich and popular.
Your task requires an event loop based on select
or epoll
. One event it would wait for is user input - when STDIN_FILENO
becomes ready for read. Another is the 1-second periodic timer when you need to poll the controller.
There are quite a few libraries that implement an event loop for you so that you can focus on what events you need to handle and how. libevent
is one of the oldest, feature rich and popular.
answered Apr 12 at 23:39
Maxim EgorushkinMaxim Egorushkin
90.7k11104193
90.7k11104193
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built intoncurses
itself. Calling the functiontimeout
and passing it0
makesgetch
(anncurses
input function) non-blocking, which also solved my problem.
– josephsturm
Apr 13 at 5:38
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.
– Guntram Blohm
Apr 13 at 7:24
add a comment |
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built intoncurses
itself. Calling the functiontimeout
and passing it0
makesgetch
(anncurses
input function) non-blocking, which also solved my problem.
– josephsturm
Apr 13 at 5:38
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.
– Guntram Blohm
Apr 13 at 7:24
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built into
ncurses
itself. Calling the function timeout
and passing it 0
makes getch
(an ncurses
input function) non-blocking, which also solved my problem.– josephsturm
Apr 13 at 5:38
Thank you for answering! This is definitely a valid answer to the question I asked, so I'm accepting it. After a lot more reading, I also discovered that there's an answer built into
ncurses
itself. Calling the function timeout
and passing it 0
makes getch
(an ncurses
input function) non-blocking, which also solved my problem.– josephsturm
Apr 13 at 5:38
4
4
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.
select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.– Guntram Blohm
Apr 13 at 7:24
The problem with this is that you're likely to have a busy-waiting loop that takes 100% of your cpu time, unless you use some variant of sleep, which makes responding to input non-immediate in most cases.
select
/poll
, or a library that's based on those, would almost certainly have less undesirable side effects.– Guntram Blohm
Apr 13 at 7:24
add a comment |
I believe that the "Unix" way would be not to ask for user input, but to react to a user signal. For example, when the user presses Ctrl-C, the currently running process receives SIGINT.
An example how to properly use SIGINT to interrupt a loop can be found here. Copying it into the answer in case the link gets stale:
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static volatile sig_atomic_t got_signal = 0;
static void my_sig_handler(int signo)
got_signal = 1;
int main()
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = &my_sig_handler;
if (sigaction(SIGINT, &sa, NULL) == -1)
perror("sigaction");
return EXIT_FAILURE;
for (;;)
if (got_signal)
got_signal = 0;
printf("Received interrupt signal!n");
printf("Doing useful stuff...n");
sleep(1); /* Sleep is not only useful, it is essential! */
return EXIT_SUCCESS;
(in your case it would be a good idea to put break;
into the if
block or to use while(!got_signal)
)
add a comment |
I believe that the "Unix" way would be not to ask for user input, but to react to a user signal. For example, when the user presses Ctrl-C, the currently running process receives SIGINT.
An example how to properly use SIGINT to interrupt a loop can be found here. Copying it into the answer in case the link gets stale:
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static volatile sig_atomic_t got_signal = 0;
static void my_sig_handler(int signo)
got_signal = 1;
int main()
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = &my_sig_handler;
if (sigaction(SIGINT, &sa, NULL) == -1)
perror("sigaction");
return EXIT_FAILURE;
for (;;)
if (got_signal)
got_signal = 0;
printf("Received interrupt signal!n");
printf("Doing useful stuff...n");
sleep(1); /* Sleep is not only useful, it is essential! */
return EXIT_SUCCESS;
(in your case it would be a good idea to put break;
into the if
block or to use while(!got_signal)
)
add a comment |
I believe that the "Unix" way would be not to ask for user input, but to react to a user signal. For example, when the user presses Ctrl-C, the currently running process receives SIGINT.
An example how to properly use SIGINT to interrupt a loop can be found here. Copying it into the answer in case the link gets stale:
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static volatile sig_atomic_t got_signal = 0;
static void my_sig_handler(int signo)
got_signal = 1;
int main()
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = &my_sig_handler;
if (sigaction(SIGINT, &sa, NULL) == -1)
perror("sigaction");
return EXIT_FAILURE;
for (;;)
if (got_signal)
got_signal = 0;
printf("Received interrupt signal!n");
printf("Doing useful stuff...n");
sleep(1); /* Sleep is not only useful, it is essential! */
return EXIT_SUCCESS;
(in your case it would be a good idea to put break;
into the if
block or to use while(!got_signal)
)
I believe that the "Unix" way would be not to ask for user input, but to react to a user signal. For example, when the user presses Ctrl-C, the currently running process receives SIGINT.
An example how to properly use SIGINT to interrupt a loop can be found here. Copying it into the answer in case the link gets stale:
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static volatile sig_atomic_t got_signal = 0;
static void my_sig_handler(int signo)
got_signal = 1;
int main()
struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = &my_sig_handler;
if (sigaction(SIGINT, &sa, NULL) == -1)
perror("sigaction");
return EXIT_FAILURE;
for (;;)
if (got_signal)
got_signal = 0;
printf("Received interrupt signal!n");
printf("Doing useful stuff...n");
sleep(1); /* Sleep is not only useful, it is essential! */
return EXIT_SUCCESS;
(in your case it would be a good idea to put break;
into the if
block or to use while(!got_signal)
)
answered Apr 12 at 23:56
Kit.Kit.
75569
75569
add a comment |
add a comment |
Simple answer is multi-threading, where you have thread deployed to wait for user input, while loop continues on. So have this:
char flag = 1;
while (flag)
// run the loop
// if thing happens deploy the thread which will ask user for input
I have not done threading in a while, I think this page would be better than me trying to explain it to you:
https://randu.org/tutorials/threads/
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing listaccu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.
– David C. Rankin
Apr 13 at 1:39
add a comment |
Simple answer is multi-threading, where you have thread deployed to wait for user input, while loop continues on. So have this:
char flag = 1;
while (flag)
// run the loop
// if thing happens deploy the thread which will ask user for input
I have not done threading in a while, I think this page would be better than me trying to explain it to you:
https://randu.org/tutorials/threads/
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing listaccu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.
– David C. Rankin
Apr 13 at 1:39
add a comment |
Simple answer is multi-threading, where you have thread deployed to wait for user input, while loop continues on. So have this:
char flag = 1;
while (flag)
// run the loop
// if thing happens deploy the thread which will ask user for input
I have not done threading in a while, I think this page would be better than me trying to explain it to you:
https://randu.org/tutorials/threads/
Simple answer is multi-threading, where you have thread deployed to wait for user input, while loop continues on. So have this:
char flag = 1;
while (flag)
// run the loop
// if thing happens deploy the thread which will ask user for input
I have not done threading in a while, I think this page would be better than me trying to explain it to you:
https://randu.org/tutorials/threads/
answered Apr 12 at 23:38
0x476f72616e0x476f72616e
2,42021129
2,42021129
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing listaccu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.
– David C. Rankin
Apr 13 at 1:39
add a comment |
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing listaccu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.
– David C. Rankin
Apr 13 at 1:39
1
1
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
But see 5 Big Fat Reasons Why Mutexes Suck Big Time for a few considerations on multi-threading.
– David C. Rankin
Apr 13 at 0:00
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing list
accu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.– David C. Rankin
Apr 13 at 1:39
Yes, I'd didn't have much of a feel one way or the other about where and what kind of pitfalls were involved in multithreading until that article was posted on the accu-general mailing list
accu-general@accu.org
. It makes some very good points on the inherent inability to validate multithreaded code.– David C. Rankin
Apr 13 at 1:39
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