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    Command:

    posix_fallocate

    
    
    

    SYNOPSIS

           #include <fcntl.h>
    
           int posix_fallocate(int fd, off_t offset, off_t len);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           posix_fallocate():
               _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
    
    
    

    DESCRIPTION

           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.
    
    
    

    RETURN VALUE

           posix_fallocate() 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

           posix_fallocate() is available since glibc 2.1.94.
    
    
    

    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), posix_fadvise(2)
    
    
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