ff07dd913e
Instead of failing with ENAMETOOLONG, which is swallowed by pthread_set_name_np() anyway, truncate the given name to MAXCOMLEN+1 bytes. This is more likely what the user wants, and saves the caller from truncating it before the call (which was the only recourse). Polish pthread_set_name_np(3) and add a .Xr to thr_set_name(2) so the user might find the documentation for this behavior. Reviewed by: jilles MFC after: 3 days Sponsored by: Dell EMC
95 lines
2.8 KiB
Groff
95 lines
2.8 KiB
Groff
.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This documentation was written by
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.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
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.\" from the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 2, 2016
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.Dt THR_SET_NAME 2
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.Os
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.Sh NAME
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.Nm thr_set_name
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.Nd set user-visible thread name
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/thr.h
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.Ft int
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.Fn thr_set_name "long id" "const char *name"
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.Sh DESCRIPTION
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The
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.Fn thr_set_name
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system call sets the user-visible name for the thread with the identifier
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.Va id
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in the current process to the NUL-terminated string
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.Va name .
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The name will be silently truncated to fit into a buffer of
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.Dv MAXCOMLEN + 1
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bytes.
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The thread name can be seen in the output of the
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.Xr ps 1
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and
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.Xr top 1
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commands, in the kernel debuggers and kernel tracing facility outputs,
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and in userland debuggers and program core files, as notes.
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.Sh RETURN VALUES
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If successful,
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.Fn thr_set_name
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returns zero; otherwise, \-1 is returned, and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn thr_set_name
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system call may return the following errors:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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The memory pointed to by the
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.Fa name
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argument is not valid.
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.It Bq Er ESRCH
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The thread with the identifier
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.Fa id
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does not exist in the current process.
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.El
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.Sh SEE ALSO
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.Xr ps 1 ,
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.Xr thr_exit 2 ,
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.Xr thr_kill 2 ,
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.Xr thr_kill2 2 ,
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.Xr thr_new 2 ,
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.Xr thr_self 2 ,
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.Xr _umtx_op 2 ,
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.Xr pthread_set_name_np 3 ,
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.Xr ddb 4 ,
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.Xr ktr 9
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.Sh STANDARDS
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The
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.Fn thr_set_name
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system call is non-standard and is used by the
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.Lb libthr .
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