1.\" Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd January 31, 2003 28.Dt PTHREAD_ATTR_GET_NP 3 29.Os 30.Sh NAME 31.Nm pthread_attr_get_np 32.Nd get attributes of existent thread 33.Sh LIBRARY 34.Lb libpthread 35.Lb libthr 36.Sh SYNOPSIS 37.In pthread_np.h 38.Ft int 39.Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst" 40.Sh DESCRIPTION 41The 42.Fn pthread_attr_get_np 43function is used to get existent thread's attributes. 44Most fields of 45.Vt pthread_attr_t 46structure are exact values of attributes provided at thread creation 47time (as parameter to 48.Xr pthread_create 3 49function), except for the stack address. 50.Pp 51Value returned as 52.Fa dst 53is supposed to be used in conjunction with 54.Fn pthread_attr_get* 55functions to retrieve individual values from 56.Vt pthread_attr_t 57structure. 58Parameter 59.Fa dst 60should point to allocated memory area big enough to fit this structure. 61.Pp 62It is HIGHLY RECOMMENDED to use 63.Xr pthread_attr_init 3 64function to allocate attribute storage. 65.Sh IMPLEMENTATION NOTES 66The 67.Fn pthread_attr_get_np 68function will always return a pointer to the thread's real stack address, 69regardless of its value in the original attributes structure. 70.Sh RETURN VALUES 71If successful, 72.Fn pthread_attr_get_np 73function returns 0. 74Otherwise, an error number is returned to indicate the error. 75.Sh EXAMPLES 76.Bd -literal 77size_t 78my_thread_stack_size(pthread_t pid) 79{ 80 pthread_attr_t attr; 81 size_t size; 82 83 pthread_attr_init(&attr); 84 pthread_attr_get_np(pid, &attr); 85 pthread_attr_getstacksize(&attr, &size); 86 pthread_attr_destroy(&attr); 87 return(size); 88} 89.Ed 90.Sh ERRORS 91The 92.Fn pthread_attr_get_np 93function will fail if: 94.Bl -tag -width Er 95.It Bq Er EINVAL 96Invalid value for one of given parameters. 97.It Bq Er ESRC 98No thread could be found corresponding to that specified by the given 99thread ID. 100.El 101.Sh SEE ALSO 102.Xr pthread_attr_destroy 3 , 103.Xr pthread_attr_getdetachstate 3 , 104.Xr pthread_attr_getinheritsched 3 , 105.Xr pthread_attr_getschedparam 3 , 106.Xr pthread_attr_getschedpolicy 3 , 107.Xr pthread_attr_getscope 3 , 108.Xr pthread_attr_getstack 3 , 109.Xr pthread_attr_getstackaddr 3 , 110.Xr pthread_attr_getstacksize 3 , 111.Xr pthread_attr_init 3 112.Sh AUTHORS 113The 114.Fn pthread_attr_get_np 115function and this manual page were written by 116.An Alexey Zelkin 117.Aq phantom@FreeBSD.org . 118