Linux kernel write()

 ssize_t read(struct file *filp, char *buff,
     size_t count, loff_t *offp);
 ssize_t write(struct file *filp, const char *buff,
     size_t count, loff_t *offp);

Source: oreilly.com

Linux kernel write()

 unsigned long copy_to_user(void *to, const void *from, 
        unsigned long count);
 unsigned long copy_from_user(void *to, const void *from, 
        unsigned long count);

Source: oreilly.com

Linux kernel write()

 ssize_t (*readv) (struct file *filp, const struct iovec *iov, 
      unsigned long count, loff_t *ppos);
 ssize_t (*writev) (struct file *filp, const struct iovec *iov, 
      unsigned long count, loff_t *ppos);

Source: oreilly.com

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