MFlibc_r: add and document pthread_attr_get_np() function.

4 files changed, 174 insertions, 0 deletions

diff --git a/lib/libpthread/man/Makefile.inc b/lib/libpthread/man/Makefile.inc
index ed041aa..2d4eea0 100644
--- a/lib/libpthread/man/Makefile.inc
+++ b/lib/libpthread/man/Makefile.inc
@@ -5,6 +5,7 @@
 .PATH: ${.CURDIR}/man
 
 MAN+=	pthread_attr.3 \
+	pthread_attr_get_np.3 \
 	pthread_cancel.3 \
 	pthread_cleanup_pop.3 \
 	pthread_cleanup_push.3 \
diff --git a/lib/libpthread/man/pthread_attr_get_np.3 b/lib/libpthread/man/pthread_attr_get_np.3
new file mode 100644
index 0000000..bf856d4
--- /dev/null
+++ b/lib/libpthread/man/pthread_attr_get_np.3
@@ -0,0 +1,115 @@
+.\" Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 31, 2003
+.Dt PTHREAD_ATTR_GET_NP 3
+.Os
+.Sh NAME
+.Nm pthread_attr_get_np
+.Nd get attributes of existent thread
+.Sh LIBRARY
+.Lb libc_r
+.Sh SYNOPSIS
+.In pthread_np.h
+.Ft int
+.Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst"
+.Sh DESCRIPTION
+The
+.Fn pthread_attr_get_np
+function is used to get existent thread's attributes.
+Most fields of
+.Vt pthread_attr_t
+structure are exact values of attributes provided at thread creation
+time (as parameter to
+.Xr pthread_create 3
+function), except for the stack address.
+.Pp
+Value returned as
+.Fa dst
+is supposed to be used in conjunction with
+.Fn pthread_attr_get*
+functions to retrieve individual values from
+.Vt pthread_attr_t
+structure.
+Parameter
+.Fa dst
+should point to allocated memory area big enough to fit this structure.
+.Pp
+It is HIGHLY RECOMMENDED to use
+.Xr pthread_attr_init 3
+function to allocate attribute storage.
+.Sh IMPLEMENTATION NOTES
+The
+.Fn pthread_attr_get_np
+function will always return a pointer to the thread's real stack address,
+regardless of its value in the original attributes structure.
+.Sh EXAMPLES
+.Bd -literal
+size_t
+my_thread_stack_size(pthread_t pid)
+{
+    pthread_attr_t attr;
+    size_t size;
+
+    pthread_attr_init(&attr);
+    pthread_attr_get_np(pid, &attr);
+    pthread_attr_getstacksize(&attr, &size);
+    pthread_attr_destroy(&attr);
+    return(size);
+}
+.Ed
+.Sh RETURN VALUES
+If successful,
+.Fn pthread_attr_get_np
+function returns 0.
+Otherwise, an error number is returned to indicate the error.
+.Sh ERRORS
+.Fn pthread_attr_get_np
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Invalid value for one of given parameters.
+.It Bq Er ESRC
+No thread could be found corresponding to that specified by the given
+thread ID.
+.El
+.Sh SEE ALSO
+.Xr pthread_attr_destroy 3 ,
+.Xr pthread_attr_getdetachstate 3 ,
+.Xr pthread_attr_getinheritsched 3 ,
+.Xr pthread_attr_getschedparam 3 ,
+.Xr pthread_attr_getschedpolicy 3 ,
+.Xr pthread_attr_getscope 3 ,
+.Xr pthread_attr_getstack 3 ,
+.Xr pthread_attr_getstackaddr 3 ,
+.Xr pthread_attr_getstacksize 3 ,
+.Xr pthread_attr_init 3
+.Sh AUTHORS
+The
+.Fn pthread_attr_get_np
+function and this manual page were written by
+.An Alexey Zelkin
+.Aq phantom@FreeBSD.org .
diff --git a/lib/libpthread/thread/Makefile.inc b/lib/libpthread/thread/Makefile.inc
index 974cdb1a..2b7800a 100644
--- a/lib/libpthread/thread/Makefile.inc
+++ b/lib/libpthread/thread/Makefile.inc
@@ -7,6 +7,7 @@ SRCS+= \
 	thr_aio_suspend.c \
 	thr_attr_destroy.c \
 	thr_attr_init.c \
+	thr_attr_get_np.c \
 	thr_attr_getdetachstate.c \
 	thr_attr_getguardsize.c \
 	thr_attr_getinheritsched.c \
diff --git a/lib/libpthread/thread/thr_attr_get_np.c b/lib/libpthread/thread/thr_attr_get_np.c
new file mode 100644
index 0000000..ba6fd19
--- /dev/null
+++ b/lib/libpthread/thread/thr_attr_get_np.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+#include <pthread_np.h>
+#include "pthread_private.h"
+
+__weak_reference(_pthread_attr_get_np, pthread_attr_get_np);
+
+int
+_pthread_attr_get_np(pthread_t pid, pthread_attr_t *dst)
+{
+	int	ret;
+
+	if (pid == NULL || dst == NULL || *dst == NULL)
+		return (EINVAL);
+
+	if ((ret = _find_thread(pid)) != 0)
+		return (ret);
+
+	memcpy(*dst, &pid->attr, sizeof(struct pthread_attr));
+
+	/*
+	 * Special case, if stack address was not provided by caller
+	 * of pthread_create(), then return address allocated internally
+	 */
+	if ((*dst)->stackaddr_attr == NULL)
+		(*dst)->stackaddr_attr = pid->stack;
+
+	return (0);
+}