Number of bytes read from the channel
When reading from a pipe in Linux (C, fread / similar), when EOF is reached, how can one know how many bytes have been read? If I read blocks at a time, fread () only returns the number of complete blocks, and I cannot read one byte at a time because it is too slow. Of course ftell () returns -1.
+1
a source to share
2 answers
You can do this with by fread()
setting the parameter size
to 1 and set nmembers
to any size. Then the number of "members" is the number of bytes, and you can still have a decent buffer size:
char buf[8192];
size_t n;
n = fread(buf, 1, sizeof buf, f);
instead
char buf[8192];
size_t n;
n = fread(buf, sizeof buf, 1, f);
+6
a source to share