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head/share/man/man9/casuword.9
| .\" Copyright (c) 2014 The FreeBSD Foundation | .\" Copyright (c) 2014, 2019 The FreeBSD Foundation | ||||
| .\" All rights reserved. | .\" All rights reserved. | ||||
| .\" | .\" | ||||
| .\" Part of this documentation was written by | .\" Part of this documentation was written by | ||||
| .\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship | .\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship | ||||
| .\" from the FreeBSD Foundation. | .\" from the FreeBSD Foundation. | ||||
| .\" | .\" | ||||
| .\" Redistribution and use in source and binary forms, with or without | .\" Redistribution and use in source and binary forms, with or without | ||||
| .\" modification, are permitted provided that the following conditions | .\" modification, are permitted provided that the following conditions | ||||
| Show All 13 Lines | |||||
| .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||||
| .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||||
| .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | .\" 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 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||||
| .\" SUCH DAMAGE. | .\" SUCH DAMAGE. | ||||
| .\" | .\" | ||||
| .\" $FreeBSD$ | .\" $FreeBSD$ | ||||
| .\" | .\" | ||||
| .Dd October 21, 2014 | .Dd April 19, 2019 | ||||
| .Dt CASU 9 | .Dt CASU 9 | ||||
| .Os | .Os | ||||
| .Sh NAME | .Sh NAME | ||||
| .Nm casueword , | .Nm casueword , | ||||
| .Nm casueword32 , | .Nm casueword32 , | ||||
| .Nm casuword , | .Nm casuword , | ||||
| .Nm casuword32 | .Nm casuword32 | ||||
| .Nd fetch, compare and store data from user-space | .Nd fetch, compare and store data from user-space | ||||
| ▲ Show 20 Lines • Show All 61 Lines • ▼ Show 20 Lines | |||||
| .Fn casuword | .Fn casuword | ||||
| and | and | ||||
| .Fn casuword32 | .Fn casuword32 | ||||
| functions return the data fetched or -1 on failure. | functions return the data fetched or -1 on failure. | ||||
| The | The | ||||
| .Fn casueword | .Fn casueword | ||||
| and | and | ||||
| .Fn casueword32 | .Fn casueword32 | ||||
| functions return 0 on success and -1 on failure. | functions return 0 on success, -1 on failure to access memory, | ||||
| and 1 when comparison or store failed. | |||||
| The store can fail on load-linked/store-conditional architectures. | |||||
| .Sh SEE ALSO | .Sh SEE ALSO | ||||
| .Xr atomic 9 , | .Xr atomic 9 , | ||||
| .Xr fetch 9 , | .Xr fetch 9 , | ||||
| .Xr store 9 | .Xr store 9 | ||||