Hello Joseph, On 9/2/18 10:56 PM, Joseph C. Sible wrote: > There's not even any such syscall as "seek". (There is an "lseek", > but it's not correct here either.) The do_sendfile function in > fs/read_write.c tests for FMODE_PREAD before erroring with -ESPIPE, > so it's actually pread() that's required to work to use an offset. > --- > man2/sendfile.2 | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/man2/sendfile.2 b/man2/sendfile.2 > index 4f85fdb..f316319 100644 > --- a/man2/sendfile.2 > +++ b/man2/sendfile.2 > @@ -165,7 +165,7 @@ the input file or the output file. > .B ESPIPE > .I offset > is not NULL but the input file is not > -.BR seek (2)-able. > +.BR pread (2)-able. > .SH VERSIONS > .BR sendfile () > first appeared in Linux 2.2. I'm not completely sure of the difference between FMODE_PREAD and "seekable", but the point is that in terms of what users understand, what is relevant here is "seekable" (as even stated in the pread(2) manual page). I applied the patch below. But if you can show me a meaningful difference between FMODE_PREAD and "seekable", I'd be happy to further update the text. Cheers, Michael diff --git a/man2/sendfile.2 b/man2/sendfile.2 index 4f85fdbd7..f0ead4a9b 100644 --- a/man2/sendfile.2 +++ b/man2/sendfile.2 @@ -164,8 +164,7 @@ the input file or the output file. .TP .B ESPIPE .I offset -is not NULL but the input file is not -.BR seek (2)-able. +is not NULL but the input file is not seekable. .SH VERSIONS .BR sendfile () first appeared in Linux 2.2. -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
