1 .\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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25 .TH FSEEKO 3 2021-03-22 "" "Linux Programmer's Manual"
27 fseeko, ftello \- seek to or report file position
32 .BI "int fseeko(FILE *" stream ", off_t " offset ", int " whence );
33 .BI "off_t ftello(FILE *" stream );
37 Feature Test Macro Requirements for glibc (see
38 .BR feature_test_macros (7)):
44 _FILE_OFFSET_BITS == 64 || _POSIX_C_SOURCE >= 200112L
51 functions are identical to
57 respectively, except that the
61 and the return value of
68 On some architectures, both
72 are 32-bit types, but defining
74 with the value 64 (before including
81 On successful completion,
85 returns the current offset.
86 Otherwise, \-1 is returned and
88 is set to indicate the error.
93 These functions are available under glibc since version 2.1.
95 For an explanation of the terms used in this section, see
103 Interface Attribute Value
107 T} Thread safety MT-Safe
113 POSIX.1-2001, POSIX.1-2008, SUSv2.
115 The declarations of these functions can also be obtained by defining