Windows 10 Issue with CTRL+D on Windows Subsystem for Linux

[mdraganic]

Hello,

I was working on an assignment using Windows Subsystem for Linux. Below is the C Code that was used to write a mini-shell for this assignment.

I ran into an interesting issue using WSL. On line 35, you can see that I call the read function to read in the buffer and it does a check for null. When pressing Control+D, while using WSL, it will go into the if statement and prints the print message on line 36 infinitely and does not stop until I used CTRL+C to exit. When running this program on a Linux machine, it behaves appropriately and prints once, and brings us to the top of the loop.

Any ideas as to what this bug could be?

Thanks

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <error.h>

char prompt[] = "$ ";

static int
Fork()
{
pid_t pid;

if ((pid = fork()) < 0)
error(EXIT_FAILURE, errno, "fork error");
return(pid);
}

int
main(void)
{
long MAX = sysconf(_SC_LINE_MAX);
char buf[MAX];
pid_t pid;
int status, n;

do {
write(STDOUT_FILENO, prompt, strlen(prompt));
fflush(NULL);
memset(buf, 0, MAX);
if((n = read(STDIN_FILENO, buf, MAX)) == 0) {
printf("use exit to exit shell\n");
continue;
}
buf[strlen(buf) - 1] = '\0'; // chomp '\n'

if (strncmp(buf, "exit", MAX) == 0) { // match
break;
}
pid = Fork();
if (pid == 0) { // child
execlp(buf, buf, (char *)NULL);
error(EXIT_FAILURE, errno, "exec failure");
}
// parent
if ((pid = waitpid(pid, &status, 0)) < 0)
error(EXIT_FAILURE, errno, "waitpid error");
} while(1);
exit(EXIT_SUCCESS);
}



The program is in C but there are no options available to insert C Code snippets..

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