ftello(3)

1FSEEKO(3)                  Linux Programmer's Manual                 FSEEKO(3)
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NAME

6       fseeko, ftello - seek to or report file position
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SYNOPSIS

9       #include <stdio.h>
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11       int fseeko(FILE *stream, off_t offset, int whence);
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13       off_t ftello(FILE *stream);
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DESCRIPTION

16       The  fseeko()  and  ftello()  functions  are  identical  to fseek() and
17       ftell() (see fseek(3)), respectively, except that the  offset  argument
18       of  fseeko()  and the return value of ftello() is of type off_t instead
19       of long.
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21       On many architectures both off_t and long are 32-bit types, but  compi‐
22       lation with
23              #define _FILE_OFFSET_BITS 64
24       will turn off_t into a 64-bit type.
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RETURN VALUE

27       On  successful  completion,  fseeko() returns 0, while ftello() returns
28       the current offset.  Otherwise, -1 is returned  and  errno  is  set  to
29       indicate the error.
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ERRORS

32       See the ERRORS in fseek(3).
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NOTES

35       These  functions  are  found  on  System  V-like systems.  They are not
36       present in libc4, libc5, glibc 2.0 but are available since glibc 2.1.
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CONFORMING TO

39       SUSv2, POSIX.1-2001.
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