On 12/11/2015 09:10 PM, Laurent Georget wrote: > As of version 4.3, sendfile(2) can return more error codes than are > documented in sendfile.2. This patch adds some details: > > - EINVAL can be returned if count is negative, from function rw_verify_area > in fs/read_write.c, called from do_sendfile, called from sys_sendfile. > - EOVERFLOW can be returned if count is too large, from rw_verify_area, > called from do_sendfile, called from sys_sendfile, or directly from > do_sendfile in one case (pos + count > max size of either in_fd or > out_fd). > - ESPIPE can be returned if offset is not a NULL pointer but the input file > does not support FMODE_PREAD, from do_sendfile, called from sys_sendfile. > > Signed-off-by: Laurent Georget <laurent.georget@xxxxxxxxxx> > --- > > I removed EPERM from the patch because actually, it cannot be returned in a > vanilla kernel. I had it in my case because of SELinux. There is a call to the > LSM hook security_file_permission inside the function rw_verify_area. > > Cheers, Thanks, Laurent. Applied. Cheers, Michael > man2/sendfile.2 | 19 ++++++++++++++++++- > 1 file changed, 18 insertions(+), 1 deletion(-) > > diff --git a/man2/sendfile.2 b/man2/sendfile.2 > index 93cf7e1..b56365e 100644 > --- a/man2/sendfile.2 > +++ b/man2/sendfile.2 > @@ -136,7 +136,10 @@ Bad address. > Descriptor is not valid or locked, or an > .BR mmap (2)-like > operation is not available for > -.IR in_fd . > +.IR in_fd , > +or > +.I count > +is negative. > .TP > .B EINVAL > .I out_fd > @@ -153,6 +156,16 @@ Unspecified error while reading from > .B ENOMEM > Insufficient memory to read from > .IR in_fd . > +.TP > +.B EOVERFLOW > +.I count > +is too large, the operation would result in exceeding the maximum size of either > +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. > .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/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
