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$Id: dwarf_undef_macro.3 3644 2018-10-15 19:55:01Z jkoshy $
.Dd November 9, 2011 .Dt DWARF_UNDEF_MACRO 3 .Os .Sh NAME .Nm dwarf_undef_macro .Nd record the removal of a macro definition .Sh LIBRARY .Lb libdwarf .Sh SYNOPSIS n libdwarf.h .Ft "int" .Fo dwarf_undef_macro .Fa "Dwarf_P_Debug dbg" .Fa "Dwarf_Unsigned lineno" .Fa "char *name" .Fa "Dwarf_Error *err" .Fc .Sh DESCRIPTION Function .Fn dwarf_undef_macro records the removal of a macro definition in a DWARF producer instance.
p Argument .Ar dbg should reference a DWARF producer instance allocated using .Xr dwarf_producer_init 3 or .Xr dwarf_producer_init_b 3 .
p Argument .Ar lineno specifies the line number of the source line where the macro definition was removed. A value of zero indicates that the macro definition was removed before any source files were read.
p Argument .Ar name should point to a NUL-terminated string containing the name of the macro.
p If argument .Ar err is not NULL, it will be used to store error information in case of an error. .Sh RETURN VALUES On success, function .Fn dwarf_undef_macro returns .Dv DW_DLV_OK . In case of an error, function .Fn dwarf_undef_macro returns .Dv DW_DLV_ERROR and sets the argument .Ar err . .Sh EXAMPLES To record the fact that the macro named .Dv _STDIO_H_ was removed at line 220 of the current macro file, use: d -literal -offset indent Dwarf_P_Debug dbg; Dwarf_Error de; /* ... Assume 'dbg' refers to a DWARF producer instance... */ if (dwarf_undef_macro(dbg, 220, "_STDIO_H_", &de) != DW_DLV_OK) errx(EXIT_FAILURE, "dwarf_def_macro failed: %s", dwarf_errmsg(-1)); .Ed .Sh ERRORS Function .Fn dwarf_undef_macro can fail with: l -tag -width ".Bq Er DW_DLE_ARGUMENT" t Bq Er DW_DLE_ARGUMENT Either arguments .Ar dbg or .Ar name was NULL. t Bq Er DW_DLE_MEMORY An out of memory condition was encountered during the execution of the function. .El .Sh SEE ALSO .Xr dwarf 3 , .Xr dwarf_def_macro 3 , .Xr dwarf_end_macro_file 3 , .Xr dwarf_producer_init 3 , .Xr dwarf_producer_init_b 3 , .Xr dwarf_start_macro_file 3 , .Xr dwarf_vendor_ext 3