[Bug libc/16852] New: recvmmsg clobbers const argument

[Bug libc/16852] New: recvmmsg clobbers const argument

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

            Bug ID: 16852
           Summary: recvmmsg clobbers const argument
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: bugdal at aerifal dot cx
                CC: drepper.fsp at gmail dot com

In sysdeps/unix/sysv/linux/recvmmsg.c, the const struct timespec *tmo argument
is passed directly to the Linux syscall recvmmsg which overwrites the
pointed-to struct with the remaining time. If this behavior is desired, the
argument needs to be changed to be a pointer-to-non-const, but the policy
elsewhere (in other analogous interfaces) seems to be to suppress the kernel
behavior by using a temp copy of the timeout to pass to the kernel.

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[Bug libc/16852] recvmmsg clobbers const argument

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com

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[Bug libc/16852] recvmmsg clobbers const argument

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|fweimer at redhat dot com          |

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[Bug libc/16852] recvmmsg clobbers const argument

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |fweimer at redhat dot com

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Shouldn't the prototype be changed instead because the interface is specific to
Linux?

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[Bug libc/16852] recvmmsg clobbers const argument

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

--- Comment #2 from Rich Felker <bugdal at aerifal dot cx> ---
This issue was discussed somewhere else -- I don't recall exactly but it was
probably the man pages list or something kernel-related -- and the feeling was
that the const in glibc is wrong since this is a Linux-specific interface. I'm
okay with removing const and updating documentation to reflect Linux behavior
if that's what you prefer. That's what we did in musl.

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[Bug network/16852] recvmmsg clobbers const argument

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16852

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|libc                        |network

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