I thought something
like:-
void write_picture(char *data) {
FILE *fp;
// data write here
}
FILE *fp;
// data write here
}
int main(void)
{
int n, fd[2],child_loop=-1;
pid_t pid;
char vidbuffer[MAXSIZE];
if (pipe(fd) < 0) {
err_sys("pipe error");
}
if ( (pid = fork()) < 0) {
err_sys("fork error");
} else {
while(-1) {
if (pid > 0) {
/* parent */
{
int n, fd[2],child_loop=-1;
pid_t pid;
char vidbuffer[MAXSIZE];
if (pipe(fd) < 0) {
err_sys("pipe error");
}
if ( (pid = fork()) < 0) {
err_sys("fork error");
} else {
while(-1) {
if (pid > 0) {
/* parent */
// close the READ pipe as we dont
use it as a
parent
close(fd[0]);
// usual code here
// start of loop
// display function call here
// write buffer[currentbufferid-1] to pipe
// end of loop
// write to the pipe and give it the DIEDIE command ;)
write(fd[1], "DIEDIE", 6);
return -1;
} else {
/* child */
close(fd[0]);
// usual code here
// start of loop
// display function call here
// write buffer[currentbufferid-1] to pipe
// end of loop
// write to the pipe and give it the DIEDIE command ;)
write(fd[1], "DIEDIE", 6);
return -1;
} else {
/* child */
// close the WRITE pipe as we
dont use it as a
child!
close(fd[1]);
while(child_loop) {
// start of infinite loop
// read from pipe
// it can either be a) frame data to write to disk or b) DIEDIE cmd
// if diedie break out of loop and exit
n=read(fd[0],vidbuffer,MAXSIZE);
if(vidbuffer[0]=="D") && (vidbuffer[1]=="I") && (vidbuffer[2]=="E") && (vidbuffer[3]=="D") && (vidbuffer[4]=="I") && (vidbuffer[5]=="E") {
// we got the die command, exit out of loop
child_loop=0;
} else {
// we just got piped a new frame to write to disk (yay!)
write_picture(vidbuffer);
}
}
// end of loop
return -1;
}
}
}
close(fd[1]);
while(child_loop) {
// start of infinite loop
// read from pipe
// it can either be a) frame data to write to disk or b) DIEDIE cmd
// if diedie break out of loop and exit
n=read(fd[0],vidbuffer,MAXSIZE);
if(vidbuffer[0]=="D") && (vidbuffer[1]=="I") && (vidbuffer[2]=="E") && (vidbuffer[3]=="D") && (vidbuffer[4]=="I") && (vidbuffer[5]=="E") {
// we got the die command, exit out of loop
child_loop=0;
} else {
// we just got piped a new frame to write to disk (yay!)
write_picture(vidbuffer);
}
}
// end of loop
return -1;
}
}
}
exit(0);
}
}
Thanks,
Kind Regards,
Matt Brocklehurst,
LookCCTV.
Tel: 01253 891222
Fax: 01253 891221
Web: www.lookcctv.com
Email: matt@xxxxxxxxxxxx
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