In Linux, threads are implemented as lightweight processes. (1) Explain the clone system call in detail, including the function and arguments (2) What is the difference between a process create by the following code and a process created by system call fork() (3) Analyse the following code, please compose the code in the blan (4) what is the command-line arguments to make the calling process and the child process run in the same memory space
In Linux, threads are implemented as lightweight processes. (1) Explain the clone system call in detail, including the function and arguments (2) What is the difference between a process create by the following code and a process created by system call fork() (3) Analyse the following code, please compose the code in the blan (4) what is the command-line arguments to make the calling process and the child process run in the same memory space
Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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In Linux, threads are implemented as lightweight processes.
(1) Explain the clone system call in detail, including the function and arguments
(2) What is the difference between a process create by the following code and a process created by system call fork()
(3) Analyse the following code, please compose the code in the blan
(4) what is the command-line arguments to make the calling process and the child process run in the same memory space
Transcribed Image Text:#define tid() syscall_NR_gettid)
#define pid() syscall(SYS_getpid)
#define SSIZE 1024*1024
int func1( 1 )
{
printf("\nin child sees buf = %s", (char *)buf1);
sprintf(bufl, "hello from child tid=%ld, pid=%ld\n", tid(), pid());
printf(" change the buffer to: %s\n", (char *)buf1);
return 0;
}
![int main( 2 )
{
char* st1 = malloc(SSIZE);
if (!st1) {
perror("malloc");exit(1);
}
unsigned long flags = 0;
if((arge > 1) && (!stremp(argv[1], "thread")))
flags |= CLONE_VM;
char buf[100];
sprintf(buf, "hello from parent pid=%ld\n", pid());
printf("in parent process before clone\n buf=%s", buf);
if (clone(_3 func1, st1 + SSIZE, flags|SIGCHLD , buf) = -1) {
perror("clone");exit(1);
}
int status2;
if (_4 waitpid(-1,&status2,0) == -1) {
perror("wait"); free(stack2);exit(1);
}
printf("in parent process: child exited with status %d.\n buf = %s \n", status2, buf);
free(stack);
return 0;
}](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff7f85bce-c8cc-4bca-8de1-63dfd7de625d%2F289785b6-359a-4457-9078-900067366bd1%2Fr6azuf_processed.png&w=3840&q=75)
Transcribed Image Text:int main( 2 )
{
char* st1 = malloc(SSIZE);
if (!st1) {
perror("malloc");exit(1);
}
unsigned long flags = 0;
if((arge > 1) && (!stremp(argv[1], "thread")))
flags |= CLONE_VM;
char buf[100];
sprintf(buf, "hello from parent pid=%ld\n", pid());
printf("in parent process before clone\n buf=%s", buf);
if (clone(_3 func1, st1 + SSIZE, flags|SIGCHLD , buf) = -1) {
perror("clone");exit(1);
}
int status2;
if (_4 waitpid(-1,&status2,0) == -1) {
perror("wait"); free(stack2);exit(1);
}
printf("in parent process: child exited with status %d.\n buf = %s \n", status2, buf);
free(stack);
return 0;
}
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