Mega Code Archive
Program that shows how fork system call works
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
int main(void)
{
pid_t pid;
char cwdir_cld[100];
char cwdir_prt[100];
if ((pid = fork()) < 0) {
perror("fork error");
exit(1);
}
if (pid == 0) {
/*
* Now we are in the childs thread
* let us issue a chdir syscall :)
*/
if(chdir("/tmp") < 0) {
perror("chdir error");
}
/*
* Let us now print the current working directory of the child
*/
if (getcwd(cwdir_cld, 100) != NULL) {
printf("
Current working directory of the child is : %s", cwdir_cld);
} else {
perror("
getcwd error");
}
/* end of the child */
} else {
/*
* Now we are in the parent thread
* Let is check the current working directory
*/
if (getcwd(cwdir_prt, 100) != NULL) {
printf("
Current working directory of the parent is : %s", cwdir_prt);
} else {
perror("
getcwd error");
}
}
printf("
");
return(0);
}
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