|POSIX_FALLOCATE(3)||Linux Programmer's Manual||POSIX_FALLOCATE(3)|
NAMEposix_fallocate - allocate file space
int posix_fallocate(int fd , off_t offset , off_t len );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
DESCRIPTIONThe 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.
RETURN VALUEposix_fallocate() returns zero on success, or an error number on failure. Note that errno is not set.
- fd is not a valid file descriptor, or is not opened for writing.
- offset+len exceeds the maximum file size.
- offset was less than 0, or len was less than or equal to 0.
- fd does not refer to a regular file.
- There is not enough space left on the device containing the file referred to by fd.
- fd refers to a pipe.
VERSIONSposix_fallocate() is available since glibc 2.1.94.
SEE ALSOfallocate(1), fallocate(2), lseek(2), posix_fadvise(2)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.