this is my c code. i created 2 child processes. but i do not know how to solve b

Question

this is my c code.

i created 2 child processes.

but i do not know how to solve below requirements...

can you add some codes for me? thanks

1. Write a series of small C programs

if a file read.txt is opened by a parent and kept open across a call to fork, is read.txt still open in the child process? If the answer is yes, when a child process reads blocks from read.txt, will the parent remain at the same position in read.txt? Write a series of small C programs

int main()
{
int fd;
pid_t pid;

pid = fork();

if (pid < 0)
{
  fprintf(stderr, "Error");
  exit(EXIT_FAILURE);
}

//child 1
else if (pid == 0)
{
  printf("I am child 1. ");
}
else
{
  pid = fork();

  // child 2
  if (pid == 0)
  {
   printf("I am child 2. ");  
  }
  else
  {

   wait (NULL);
   exit(EXIT_SUCCESS);
  }
}
}

Explanation / Answer

If a file read.txt is opened by a parent and kept open across a call to fork, is read.txt still open in the child process?

Yes

==========

Use the below code

==========

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main()
{
FILE *fp;
char buff[255];
fp = fopen("read.txt","r");
int fd;
pid_t pid;
printf("I am Parent ");
fgets(buff, 255, (FILE*)fp);
printf("1: %s ", buff );

pid = fork();
if (pid < 0)
{
fprintf(stderr, "Error");
exit(EXIT_FAILURE);
}
//child 1
else if (pid == 0)
{
printf("I am child 1. ");
fgets(buff, 255, (FILE*)fp);
printf("2: %s ", buff );
}
else
{
printf("I am Parent ");
fgets(buff, 255, (FILE*)fp);
printf("3: %s ", buff );
pid = fork();
// child 2
if (pid == 0)
{
printf("I am child 2. ");
fgets(buff, 255, (FILE*)fp);
printf("4: %s ", buff );
}
else
{
wait (NULL);
exit(EXIT_SUCCESS);
}
printf("I am Parent ");
fgets(buff, 255, (FILE*)fp);
printf("5: %s ", buff );
}
fclose(fp);
}

=======================

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.