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| 1 | .TH TRUNCATE 2 "Feb 13, 2006"
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| 2 | .UC 4
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| 3 | .SH NAME
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| 4 | truncate, ftruncate \- truncate a file to a specified length (may extend)
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| 5 | .SH SYNOPSIS
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| 6 | .ft B
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| 7 | .nf
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| 8 | #include <unistd.h>
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| 9 |
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| 10 | int truncate(char *filename, off_t length);
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| 11 | int ftruncate(int fd, off_t length);
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| 12 | .fi
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| 13 | .ft R
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| 14 | .SH DESCRIPTION
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| 15 | .B Truncate
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| 16 | causes the file
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| 17 | .B filename
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| 18 | to be set to the length
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| 19 | .B length
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| 20 | causing data after that size to be lost. If the file is set to a
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| 21 | length larger than the current file size, the new region can be
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| 22 | written to but reads as zeroes. There will be no disk blocks reserved
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| 23 | for it. This is a hole.
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| 24 | .PP
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| 25 | .B Ftruncate
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| 26 | does the same thing as
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| 27 | .B truncate
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| 28 | but operates on a file descriptor instead of a filename.
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| 29 | .SH "SEE ALSO
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| 30 | .BR fcntl (2)
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