diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/Makefile.am | 8 | ||||
| -rw-r--r-- | man/Makefile.in | 448 | ||||
| -rw-r--r-- | man/ffi.3 | 31 | ||||
| -rw-r--r-- | man/ffi_call.3 | 103 | ||||
| -rw-r--r-- | man/ffi_prep_cif.3 | 66 |
5 files changed, 656 insertions, 0 deletions
diff --git a/man/Makefile.am b/man/Makefile.am new file mode 100644 index 0000000..2519277 --- /dev/null +++ b/man/Makefile.am @@ -0,0 +1,8 @@ +## Process this with automake to create Makefile.in + +AUTOMAKE_OPTIONS=foreign + +EXTRA_DIST = ffi.3 ffi_call.3 ffi_prep_cif.3 + +man_MANS = ffi.3 ffi_call.3 ffi_prep_cif.3 + diff --git a/man/Makefile.in b/man/Makefile.in new file mode 100644 index 0000000..3e40be2 --- /dev/null +++ b/man/Makefile.in @@ -0,0 +1,448 @@ +# Makefile.in generated by automake 1.11 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, +# Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; 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The return value from +.Fa fn +is placed in storage pointed to by +.Fa rvalue . +.Fa cif +contains information describing the data types, sizes and alignments of the +arguments to and return value from +.Fa fn , +and must be initialized with +.Nm ffi_prep_cif +before it is used with +.Nm ffi_call . +.Pp +.Fa rvalue +must point to storage that is sizeof(ffi_arg) or larger for non-floating point +types. For smaller-sized return value types, the +.Nm ffi_arg +or +.Nm ffi_sarg +integral type must be used to hold +the return value. +.Sh EXAMPLES +.Bd -literal +#include <ffi.h> +#include <stdio.h> + +unsigned char +foo(unsigned int, float); + +int +main(int argc, const char **argv) +{ + ffi_cif cif; + ffi_type *arg_types[2]; + void *arg_values[2]; + ffi_status status; + + // Because the return value from foo() is smaller than sizeof(long), it + // must be passed as ffi_arg or ffi_sarg. + ffi_arg result; + + // Specify the data type of each argument. Available types are defined + // in <ffi/ffi.h>. + arg_types[0] = &ffi_type_uint; + arg_types[1] = &ffi_type_float; + + // Prepare the ffi_cif structure. + if ((status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, + 2, &ffi_type_uint8, arg_types)) != FFI_OK) + { + // Handle the ffi_status error. + } + + // Specify the values of each argument. + unsigned int arg1 = 42; + float arg2 = 5.1; + + arg_values[0] = &arg1; + arg_values[1] = &arg2; + + // Invoke the function. + ffi_call(&cif, FFI_FN(foo), &result, arg_values); + + // The ffi_arg 'result' now contains the unsigned char returned from foo(), + // which can be accessed by a typecast. + printf("result is %hhu", (unsigned char)result); + + return 0; +} + +// The target function. +unsigned char +foo(unsigned int x, float y) +{ + unsigned char result = x - y; + return result; +} +.Ed +.Sh SEE ALSO +.Xr ffi 3 , +.Xr ffi_prep_cif 3 diff --git a/man/ffi_prep_cif.3 b/man/ffi_prep_cif.3 new file mode 100644 index 0000000..9436b31 --- /dev/null +++ b/man/ffi_prep_cif.3 @@ -0,0 +1,66 @@ +.Dd February 15, 2008 +.Dt ffi_prep_cif 3 +.Sh NAME +.Nm ffi_prep_cif +.Nd Prepare a +.Nm ffi_cif +structure for use with +.Nm ffi_call +. +.Sh SYNOPSIS +.In ffi.h +.Ft ffi_status +.Fo ffi_prep_cif +.Fa "ffi_cif *cif" +.Fa "ffi_abi abi" +.Fa "unsigned int nargs" +.Fa "ffi_type *rtype" +.Fa "ffi_type **atypes" +.Fc +.Sh DESCRIPTION +The +.Nm ffi_prep_cif +function prepares a +.Nm ffi_cif +structure for use with +.Nm ffi_call +. +.Fa abi +specifies a set of calling conventions to use. +.Fa atypes +is an array of +.Fa nargs +pointers to +.Nm ffi_type +structs that describe the data type, size and alignment of each argument. +.Fa rtype +points to an +.Nm ffi_type +that describes the data type, size and alignment of the +return value. +.Sh RETURN VALUES +Upon successful completion, +.Nm ffi_prep_cif +returns +.Nm FFI_OK . +It will return +.Nm FFI_BAD_TYPEDEF +if +.Fa cif +is +.Nm NULL +or +.Fa atypes +or +.Fa rtype +is malformed. If +.Fa abi +does not refer to a valid ABI, +.Nm FFI_BAD_ABI +will be returned. Available ABIs are +defined in +.Nm <ffitarget.h> +. +.Sh SEE ALSO +.Xr ffi 3 , +.Xr ffi_call 3 |