1 .\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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25 .TH FSEEKO 3 2017-09-15 "" "Linux Programmer's Manual"
27 fseeko, ftello \- seek to or report file position
32 .BI "int fseeko(FILE *" stream ", off_t " offset ", int " whence );
34 .BI "off_t ftello(FILE *" stream );
39 Feature Test Macro Requirements for glibc (see
40 .BR feature_test_macros (7)):
48 _FILE_OFFSET_BITS\ ==\ 64 || _POSIX_C_SOURCE\ >=\ 200112L
50 (defining the obsolete _LARGEFILE_SOURCE macro also works)
58 functions are identical to
64 respectively, except that the
68 and the return value of
75 On some architectures, both
79 are 32-bit types, but defining
81 with the value 64 (before including
88 On successful completion,
92 returns the current offset.
93 Otherwise, \-1 is returned and
95 is set to indicate the error.
100 These functions are available under glibc since version 2.1.
102 For an explanation of the terms used in this section, see
108 Interface Attribute Value
112 T} Thread safety MT-Safe
116 POSIX.1-2001, POSIX.1-2008, SUSv2.