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1 .\" $NetBSD: gelf_getrela.3,v 1.2 2014/03/09 16:58:04 christos Exp $
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3 .\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
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14 .\" This software is provided by Joseph Koshy ``as is'' and
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26 .\" Id: gelf_getrela.3 189 2008-07-20 10:38:08Z jkoshy
27 .\"
28 .Dd August 29, 2006
29 .Os
30 .Dt GELF_GETRELA 3
31 .Sh NAME
32 .Nm gelf_getrela ,
33 .Nm gelf_update_rela
34 .Nd read and update ELF relocation entries with addends
35 .Sh LIBRARY
36 .Lb libelf
37 .Sh SYNOPSIS
38 .In gelf.h
39 .Ft "GElf_Rela *"
40 .Fn gelf_getrela "Elf_Data *data" "int ndx" "GElf_Rela *rela"
41 .Ft int
42 .Fn gelf_update_rela "Elf_Data *data" "int ndx" "GElf_Rela *rela"
43 .Sh DESCRIPTION
44 These convenience functions are used to retrieve and update class-dependent
45 .Vt Elf32_Rela
46 or
47 .Vt Elf64_Rela
48 structures in an ELF object.
49 .Pp
50 Argument
51 .Ar data
52 is an
53 .Vt Elf_Data
54 descriptor associated with a section of type
55 .Dv SHT_RELA .
56 Argument
57 .Ar ndx
58 is the index of the entry being retrieved or updated.
59 The class-independent
60 .Vt GElf_Rela
61 structure is described in
62 .Xr gelf 3 .
63 .Pp
64 Function
65 .Fn gelf_getrela
66 retrieves the class-dependent entry at index
67 .Ar ndx
68 in data buffer
69 .Ar data
70 and copies it to the destination pointed to by argument
71 .Ar rela
72 after translation to class-independent form.
73 .Pp
74 Function
75 .Fn gelf_update_rela
76 converts the class-independent entry pointed to
77 by argument
78 .Ar rela
79 to class-dependent form, and writes it to the entry at index
80 .Ar ndx
81 in the data buffer described by argument
82 .Ar data .
83 Function
84 .Fn gelf_update_rela
85 signals an error if any of the values in the class-independent
86 representation exceeds the representable limits of the target
87 type.
88 .Sh RETURN VALUES
89 Function
90 .Fn gelf_getrela
91 returns the value of argument
92 .Ar rela
93 if successful, or NULL in case of an error.
94 Function
95 .Fn gelf_update_rela
96 returns a non-zero value if successful, or zero in case of an error.
97 .Sh ERRORS
98 These functions may fail with the following errors:
99 .Bl -tag -width "[ELF_E_RESOURCE]"
100 .It Bq Er ELF_E_ARGUMENT
101 Arguments
102 .Ar data
103 or
104 .Ar rela
105 were NULL.
106 .It Bq Er ELF_E_ARGUMENT
107 Argument
108 .Ar ndx
109 was less than zero or larger than the number of entries in the data
110 descriptor.
111 .It Bq Er ELF_E_ARGUMENT
112 Data descriptor
113 .Ar data
114 was not associated with a section of type
115 .Dv SHT_RELA .
116 .It Bq Er ELF_E_RANGE
117 A value was not representable in the target type.
118 .El
119 .Sh SEE ALSO
120 .Xr elf 3 ,
121 .Xr elf_getdata 3 ,
122 .Xr elf_getscn 3 ,
123 .Xr gelf 3