svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
posix_fallocate(3c)
posix_fallocate(3C) Standard C Library Functions posix_fallocate(3C)
NAME
posix_fallocate - file space control
SYNOPSIS
#include <fcntl.h>
int posix_fallocate(int fd, off_t offset, off_t len);
DESCRIPTION
The posix_fallocate() function ensures that any required storage for
regular file data starting at offset and continuing for len bytes is
allocated on the file system storage media. If posix_fallocate() re‐
turns successfully, subsequent writes to the specified file data will
not fail due to the lack of free space on the file system storage me‐
dia.
If the offset+len is beyond the current file size, then posix_fallo‐
cate() adjusts the file size to offset+len. Otherwise, the file size is
not changed.
Space allocated with posix_fallocate() is freed by a successful call to
creat(2) or open(2) that truncates the size of the file. Space allo‐
cated with posix_fallocate() may be freed by a successful call to
ftruncate(3C) that reduces the file size to a size smaller than off‐
set+len.
RETURN VALUES
Upon successful completion, posix_fallocate() returns zero. Otherwise,
an error number is returned to indicate the error.
ERRORS
The posix_fallocate() function will fail if:
EAGAIN The file exists, mandatory file/record locking is set, and
there are outstanding record locks on the file. See
chmod(2).
EBADF The fd argument is not a valid file descriptor or references
a file that was opened without write permission.
EDEADLK The file exists, mandatory file/record locking is set and a
deadlock condition was detected.
EFBIG The value of offset+len is greater than the maximum file
size.
EINTR A signal was caught during execution.
EINVAL The len argument is less than or equal to zero, or the off‐
set argument is less than zero.
EIO An I/O error occurred while reading from or writing to a
file system.
ENODEV The fd argument does not refer to a regular file.
ENOLINK The fd argument points to a remote machine and the link to
that machine is no longer active.
ENOSPC There is insufficient free space remaining on the file sys‐
tem storage media.
EPERM The file has one or more of the appendonly, readonly, im‐
mutable, or rtime system attributes set.
ESPIPE The fd argument is associated with a pipe or FIFO.
USAGE
The posix_fallocate() function has a transitional interface for 64-bit
file offsets. See lf64(7).
Due to the copy-on-write nature of zfs(4FS), posix_fallocate() will not
actually allocate additional space on ZFS filesystems.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
chmod(2), creat(2), open(2), unlink(2), ftruncate(3C), spawn.h(3HEAD),
attributes(7), standards(7), sysattr(7)
HISTORY
The posix_fallocate() function was added in Solaris 11.0.0.
Oracle Solaris 11.4 27 Aug 2025 posix_fallocate(3C)