diff options
Diffstat (limited to 'lib/libc/gen/getcontext.3')
| -rw-r--r-- | lib/libc/gen/getcontext.3 | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/lib/libc/gen/getcontext.3 b/lib/libc/gen/getcontext.3 index 2fda6b8..5b801fd 100644 --- a/lib/libc/gen/getcontext.3 +++ b/lib/libc/gen/getcontext.3 @@ -35,11 +35,11 @@ .\" .\" $FreeBSD$ .\" -.Dd September 10, 2002 +.Dd December 26, 2011 .Dt GETCONTEXT 3 .Os .Sh NAME -.Nm getcontext , setcontext +.Nm getcontext , getcontextx , setcontext .Nd get and set user thread context .Sh LIBRARY .Lb libc @@ -59,6 +59,20 @@ This saved context may then later be restored by calling .Fn setcontext . .Pp The +.Fn getcontextx +function saves the current execution context in the newly allocated structure +.Vt ucontext_t , +which is returned on success. +If architecture defines additional CPU states that can be stored in extended +blocks referenced from the +.Vt ucontext_t , +the memory for them may be allocated and their context also stored. +Memory returned by +.Fn getcontextx +function shall be freed using +.Fn free 3 . +.Pp +The .Fn setcontext function makes a previously saved thread context the current thread context, i.e., @@ -109,11 +123,24 @@ If successful, returns zero and .Fn setcontext does not return; otherwise \-1 is returned. +The +.Fn getcontextx +returns pointer to the allocated and initialized context on success, and +.Va NULL +on failure. .Sh ERRORS No errors are defined for .Fn getcontext or .Fn setcontext . +The +.Fn getcontextx +may return the following errors in +.Va errno : +.Bl -tag -width Er +.It Bq Er ENOMEM +No memory was available to allocate for the context or some extended state. +.El .Sh SEE ALSO .Xr sigaction 2 , .Xr sigaltstack 2 , |
