Hello list readers,
I am having some confusion about how pipes work in Linux
when being read/written with fread/fwrite. I am getting some
random data error and suspect it may be how pipes work.
Several programs are piping data between job steps. It seems
to me if I use either:
fwrite(bufptr, size=1, count=100, fp) or
fwrite(bufptr, size=100, count=1, fp that 100 bytes will be
written to the pipe before the system returns from the fwrite
call. There is never a partial write to the pipe.
Right?
If I use fread(bufptr, size=1, count=100, fp), the system MAY
return a count of less that 100 bytes and not give an error
indication via ferror(fp). Right?
But if I use fread(bufptr, size=100, count=1, fp) that the system
will ONLY return when 100 bytes have been read and never give
a partial read because the count returned can only be 0 or 1.
Right?
The programs involved do not test for short reads and have a mixture
of both forms of fread calls. I think I can solve my problem if I
make sure all reads use a count of 1 and a size of the buffer I want
to read. Right?
Thanks in advance,
Jim Bevier
[EMAIL PROTECTED]
--
To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe"
as the Subject.
