|Linux Standard Base Core Specification 4.0|
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pwrite64() shall write count bytes from buf to the file associated with the open file descriptor fd, at the position specified by offset, without changing the file position.
pwrite64() is a large-file version of the pwrite() function as defined in ISO POSIX (2003). It differs from pwrite() in that the offset parameter is an off64_t instead of an off_t
On success, pwrite64() shall return the number
of bytes actually written. Otherwise pwrite()
shall return -1 and
errno to indicate the error.
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