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size_t write(int fd, const char *buf, size_t count);
fd: [in] the file descriptor to read from.
buf: [out] the buffer where to store the data read.
count: [in] the maximum count of bytes to read.
Read up to count bytes form fd.
On success, the number of bytes read. On error, returns -1 and sets
errno to one of the following values:
EINVAL: the kind of object attached to fd cannot be
written to.
EBADF, EFAULT, EPIPE, EINTR,
EAGAIN, ENOSPC.
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