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POSIX_FALLOCATE(3) Linux Programmer's Manual POSIX_FALLOCATE(3)
posix_fallocate - allocate file space
#define _XOPEN_SOURCE 600
int posix_fallocate(int fd, off_t offset, off_t len);
The function posix_fallocate() ensures that disk space is allocated for
the file referred to by the descriptor fd for the bytes in the range
starting at offset and continuing for len bytes. After a successful
call to posix_fallocate(), subsequent writes to bytes in the specified
range are guaranteed not to fail because of lack of disk space.
If the size of the file is less than offset+len, then the file is
increased to this size; otherwise the file size is left unchanged.
posix_fallocate() returns zero on success, or an error number on fail-
ure. Note that errno is not set.
EBADF fd is not a valid file descriptor, or is not opened for writing.
EFBIG offset+len exceeds the maximum file size.
EINVAL offset or len was less than 0.
ENODEV fd does not refer to a regular file.
ENOSPC There is not enough space left on the device containing the file
referred to by fd.
ESPIPE fd refers to a pipe of file descriptor.
posix_fallocate() is available since glibc 2.1.94.
GNU 2006-03-01 POSIX_FALLOCATE(3)
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