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#include <stdlib.h>
#include <stdio.h>
#include <malloc.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
typedef unsigned char byte;
int read_cmd(byte *buf)
{
int len;
if (read_exact(buf, 4) != 4)
return(-1);
len = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
return read_exact(buf, len);
}
int write_cmd(byte *buf, int len)
{
byte li[4];
li[0] = (len >> 24) & 0xff;
li[1] = (len >> 16) & 0xff;
li[2] = (len >> 8) & 0xff;
li[3] = len & 0xff;
write_exact(&li, 4);
return write_exact(buf, len);
}
int read_exact(byte *buf, int len)
{
int i, got=0;
do {
if ((i = read(0, buf+got, len-got)) <= 0)
{
return(i);
}
got += i;
} while (got<len);
return len;
}
int write_exact(byte *buf, int len)
{
int i, wrote = 0;
do {
if ((i = write(1, buf+wrote, len-wrote)) < 0)
return (i);
wrote += i;
} while (wrote<len);
return len;
}
int main(int argc, char **argv) {
int sleep_time = atoi(argv[1]);
int fn, arg, res;
byte *buf = malloc(31457280); // 30 mb
int len = 0;
while ((len = read_cmd(buf)) > 0) {
usleep(sleep_time);
write_cmd(buf, len);
}
}
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