mirror of https://github.com/mkerrisk/man-pages
97 lines
2.6 KiB
Groff
97 lines
2.6 KiB
Groff
.\" Copyright (c) 2006, Michael Kerrisk <mtk.manpages@gmail.com>
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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.\" manual page may be incorrect or out-of-date.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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.\" 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 POSIX_FALLOCATE 3 2008-03-03 "GNU" "Linux Programmer's Manual"
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.SH NAME
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posix_fallocate \- allocate file space
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.SH SYNOPSIS
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.nf
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.B #define _XOPEN_SOURCE 600
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.B #include <fcntl.h>
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.sp
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.BI "int posix_fallocate(int " fd ", off_t " offset ", off_t " len );
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.fi
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.SH DESCRIPTION
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The function
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.BR posix_fallocate ()
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ensures that disk space is allocated for the file referred to by the
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descriptor
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.I fd
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for the bytes in the range starting at
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.I offset
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and continuing for
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.I len
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bytes.
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After a successful call to
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.BR posix_fallocate (),
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subsequent writes to bytes in the specified range are
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guaranteed not to fail because of lack of disk space.
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If the size of the file is less than
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.IR offset + len ,
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then the file is increased to this size;
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otherwise the file size is left unchanged.
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.SH "RETURN VALUE"
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.BR posix_fallocate ()
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returns zero on success, or an error number on failure.
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Note that
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.I errno
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is not set.
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.SH "ERRORS"
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.TP
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.B EBADF
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.I fd
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is not a valid file descriptor, or is not opened for writing.
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.TP
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.B EFBIG
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.I offset+len
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exceeds the maximum file size.
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.TP
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.B EINVAL
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.I offset
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or
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.I len
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was less than 0.
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.TP
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.B ENODEV
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.I fd
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does not refer to a regular file.
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.TP
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.B ENOSPC
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There is not enough space left on the device containing the file
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referred to by
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.IR fd .
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.TP
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.B ESPIPE
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.I fd
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refers to a pipe of file descriptor.
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.SH VERSIONS
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.BR posix_fallocate ()
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is available since glibc 2.1.94.
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.SH "CONFORMING TO"
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POSIX.1-2001.
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.SH "SEE ALSO"
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.BR fallocate (2),
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.BR lseek (2),
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.BR posix_fadvise (2),
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.BR feature_test_macros (7)
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