Working with the Unix OS

Processes II
int readline(int fd, char *str)
{
int nread;
while (((nread=read(fd, str, 1)) > 0) && (*str++ != NULL))
return (nread > 0); /* false if end of file */
}
main(int argc,char *argv)
{
int fd;
char str[100];
mkfifo (" PIPE");
if ((fd=open("PIPE", O_RDONLY)) == -1){
fprintf(stderr, "%s: can't open PIPE\n", argv[0]);
exit(1) ;
}
while (readline(fd, str))
printf("%s\n", str);
close(fd);
unlink("PIPE") ;
}
/* writer.c */
#include
#include
main()
{
int fd,i;
char str[100];
mkfifo("PIPE"); /* if it does not already exist */
while ((fd=open ("PIPE", O_WRONLY) < 0))
sleep(1); /* wait for reader */
}
sprintf(str, "hello from PID %d", getpid());
for (i=0; i