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Mohan

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#include<stdio.h>

#include <fcntl.h>

int main()

{

int fd1 = open("foo.txt", O_RDONLY);

if (fd1 < 0)

{

perror("c1");

exit(1);

}

printf("opened the fd = % d\n", fd1);

// Using close system Call

if (close(fd1) < 0)

{

perror("c1");

exit(1);

}

printf("closed the fd.\n");

}

Output:

opened the fd = 3

closed the fd.

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#include<stdio.h>#include <fcntl.h>int main(){int fd1 = open("foo.txt", O_RDONLY);if (fd1 < 0){perror("c1");exit(1);}printf("opened the fd = % d\n", fd1);// Using cl…

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