[Bug libc/26402] New: pthread_setname_np should truncate instead of bail out

[Bug libc/26402] New: pthread_setname_np should truncate instead of bail out

[trass3r at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26402

            Bug ID: 26402
           Summary: pthread_setname_np should truncate instead of bail out
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: trass3r at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

IMHO pthread_setname_np should truncate instead of bail out, i.e. do
size_t name_len = min(strlen(name), TASK_COMM_LEN);
@
https://code.woboq.org/userspace/glibc/sysdeps/unix/sysv/linux/pthread_setname.c.html#39

Especially in cross-platform code you may have thread names longer than
TASK_COMM_LEN and a truncated name is more useful when debugging than an unset
one.

The function can still return ERANGE in the end.

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[Bug libc/26402] pthread_setname_np should truncate instead of bail out

[trass3r at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26402

--- Comment #1 from trass3r <trass3r at gmail dot com> ---
In fact both PR_SET_NAME and writing to /proc/self/task/%u/comm automatically
truncate.
https://man7.org/linux/man-pages/man2/prctl.2.html

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