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| 1 | .\" @(#)fseek.3s 6.3 (Berkeley) 2/24/86
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| 2 | .\"
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| 3 | .TH FSEEK 3 "February 24, 1986"
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| 4 | .AT 3
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| 5 | .SH NAME
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| 6 | fseek, ftell, rewind \- reposition a stream
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| 7 | .SH SYNOPSIS
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| 8 | .nf
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| 9 | .ft B
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| 10 | #include <stdio.h>
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| 11 |
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| 12 | int fseek(FILE *\fIstream\fP, long \fIoffset\fP, int \fIptrname\fP)
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| 13 | long ftell(FILE *\fIstream\fP)
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| 14 | void rewind(FILE *\fIstream\fP)
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| 15 | .ft R
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| 16 | .fi
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| 17 | .SH DESCRIPTION
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| 18 | .B Fseek
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| 19 | sets the position of the next input or output
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| 20 | operation on the
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| 21 | .IR stream .
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| 22 | The new position is at the signed distance
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| 23 | .I offset
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| 24 | bytes
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| 25 | from the beginning, the current position, or the end of the file,
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| 26 | according as
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| 27 | .I ptrname
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| 28 | has the value 0, 1, or 2.
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| 29 | .PP
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| 30 | .B Fseek
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| 31 | undoes any effects of
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| 32 | .BR ungetc (3).
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| 33 | .PP
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| 34 | .B Ftell
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| 35 | returns the current value of the offset relative to the beginning
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| 36 | of the file associated with the named
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| 37 | .IR stream .
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| 38 | It is measured in bytes on UNIX;
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| 39 | on some other systems it is a magic cookie,
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| 40 | and the only foolproof way to obtain an
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| 41 | .I offset
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| 42 | for
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| 43 | .BR fseek .
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| 44 | .PP
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| 45 | .BR Rewind "(\fIstream\fR)"
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| 46 | is equivalent to
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| 47 | .BR fseek "(\fIstream\fR, 0L, 0)."
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| 48 | .SH "SEE ALSO"
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| 49 | .BR lseek (2),
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| 50 | .BR fopen (3).
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| 51 | .SH DIAGNOSTICS
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| 52 | .B Fseek
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| 53 | returns \-1 for improper seeks, otherwise zero.
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