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sendfile.2: Document more ERRORS 

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@supelec.fr>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Laurent Georget 2015-12-11 21:10:04 +01:00 committed by Michael Kerrisk
parent 300c07ddd8
commit 4975d6af79
1 changed files with 14 additions and 1 deletions
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15
man2/sendfile.2
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@ -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.