[PATCH] sendfile.2: Document more return values

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Signed-off-by: Laurent Georget <laurent.georget@xxxxxxxxxx>

Some return values are not documented in sendfile.2, this patch adds some
details.
---
 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 +156,20 @@ 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 EPERM
+Permissions are insufficient for reading from the input file or writing to 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.
-- 
2.4.10

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