mirror of https://github.com/mkerrisk/man-pages
83 lines
2.2 KiB
Groff
83 lines
2.2 KiB
Groff
.\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.TH FSEEKO 3 2001-11-05 "" "Linux Programmer's Manual"
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.SH NAME
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fseeko, ftello \- seek to or report file position
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.SH SYNOPSIS
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.nf
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.B #include <stdio.h>
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.sp
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.BI "int fseeko(FILE *" stream ", off_t " offset ", int " whence );
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.sp
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.BI "off_t ftello(FILE *" stream );
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.BI
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.fi
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.SH DESCRIPTION
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The
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.BR fseeko ()
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and
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.BR ftello ()
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functions are identical to
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.BR fseek (3)
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and
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.BR ftell (3)
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(see
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.BR fseek (3)),
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respectively, except that the \fIoffset\fP argument of
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.BR fseeko ()
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and the return value of
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.BR ftello ()
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is of type \fIoff_t\fP
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instead of \fIlong\fP.
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.LP
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On many architectures both \fIoff_t\fP and \fIlong\fP are 32-bit types,
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but compilation with
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.RS
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.nf
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#define _FILE_OFFSET_BITS 64
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.fi
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.RE
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.PP
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will turn \fIoff_t\fP into a 64-bit type.
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.SH RETURN VALUE
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On successful completion,
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.BR fseeko ()
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returns 0, while
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.BR ftello ()
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returns the current offset.
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Otherwise, \-1 is returned and
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.I errno
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is set to indicate the error.
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.SH ERRORS
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See the ERRORS in
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.BR fseek (3).
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.SH "CONFORMING TO"
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SUSv2, POSIX.1-2001.
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.SH NOTES
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These functions are found on System V-like systems.
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They are not present in libc4, libc5, glibc 2.0
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but are available since glibc 2.1.
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.SH "SEE ALSO"
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.BR fseek (3)
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