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FFI: Add ffi.errno().

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This commit is contained in:
Mike Pall 2011-05-08 22:34:40 +02:00
parent 77ba7726e2
commit 868ecad32b
2 changed files with 30 additions and 0 deletions
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22
doc/ext_ffi_api.html
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@ -336,6 +336,28 @@ objects.
<h2 id="util">Utility Functions</h2> <h2 id="util">Utility Functions</h2>
<h3 id="ffi_errno"><tt>err = ffi.errno()</tt></h3>
<p>
Returns the error number set by the last C&nbsp;function call which
indicated an error condition.
</p>
<p>
This function offers a portable and OS-independent way to get the error
number. Note that only <em>some</em> C&nbsp;functions set the error
number. And it's only significant if the function actually indicated an
error condition (e.g. with a return value of <tt>-1</tt> or
<tt>NULL</tt>). Otherwise, it may or may not contain any previously set
value.
</p>
<p>
You're advised to call this function only when needed and as close as
possible after the return of the related C&nbsp;function. The
<tt>errno</tt> value is preserved across hooks, memory allocations,
invocations of the JIT compiler and other internal VM activity. The same
applies to the value returned by <tt>GetLastError()</tt> on Windows, but
you need to declare and call it yourself.
</p>
<h3 id="ffi_string"><tt>str = ffi.string(ptr [,len])</tt></h3> <h3 id="ffi_string"><tt>str = ffi.string(ptr [,len])</tt></h3>
<p> <p>
Creates an interned Lua string from the data pointed to by Creates an interned Lua string from the data pointed to by

8
src/lib_ffi.c
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@ -6,6 +6,8 @@
#define lib_ffi_c #define lib_ffi_c
#define LUA_LIB #define LUA_LIB
#include <errno.h>
#include "lua.h" #include "lua.h"
#include "lauxlib.h" #include "lauxlib.h"
#include "lualib.h" #include "lualib.h"
@ -541,6 +543,12 @@ LJLIB_CF(ffi_offsetof)
return 0; return 0;
} }
LJLIB_CF(ffi_errno)
{
setintV(L->top++, errno);
return 1;
}
LJLIB_CF(ffi_string) LJLIB_REC(.) LJLIB_CF(ffi_string) LJLIB_REC(.)
{ {
CTState *cts = ctype_cts(L); CTState *cts = ctype_cts(L);