NAME
posixfallocate - allocate file space SYNOPSIS
#include
int posixfallocate(int fd, offt offset, offt len); Feature Test Macro Requirements for glibc (see featuretestmacros(7)): posixfallocate(): XOPENSOURCE >= 600 || POSIXCSOURCE >= 200112L DESCRIPTION The function posixfallocate() 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 posixfallocate(), 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. RETURN VALUE posixfallocate() returns zero on success, or an error number on fail‐ ure. Note that errno is not set. ERRORS EBADF fd is not a valid file descriptor, or is not opened for writing. EFBIG offset+len exceeds the maximum file size. EINVAL offset was less than 0, or len was less than or equal to 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. VERSIONS posixfallocate() is available since glibc 2.1.94. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────┼───────────────┼─────────┤ │posixfallocate() │ Thread safety │ MT-Safe │ └──────────────────┴───────────────┴─────────┘ CONFORMING TO
POSIX.1-2001.
POSIX.1-2008 says that an implementation shall give the EINVAL error if
len was 0, or offset was less than 0. POSIX.1-2001 says that an imple‐ mentation shall give the EINVAL error if len is less than 0, or offset was less than 0, and may give the error if len equals zero. SEE ALSO fallocate(1), fallocate(2), lseek(2), posixfadvise(2) COLOPHON
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GNU 2013-02-12 POSIXFALLOCATE(3)