The C and C++ Include Header Files

/usr/include/linux/uio.h


$ cat -n /usr/include/linux/uio.h

     1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
     2	/*
     3	 *	Berkeley style UIO structures	-	Alan Cox 1994.
     4	 *
     5	 *		This program is free software; you can redistribute it and/or
     6	 *		modify it under the terms of the GNU General Public License
     7	 *		as published by the Free Software Foundation; either version
     8	 *		2 of the License, or (at your option) any later version.
     9	 */
    10	#ifndef __LINUX_UIO_H
    11	#define __LINUX_UIO_H
    12	
    13	
    14	#include <linux/types.h>
    15	
    16	
    17	struct iovec
    18	{
    19		void *iov_base;	/* BSD uses caddr_t (1003.1g requires void *) */
    20		__kernel_size_t iov_len; /* Must be size_t (1003.1g) */
    21	};
    22	
    23	/*
    24	 *	UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
    25	 */
    26	 
    27	#define UIO_FASTIOV	8
    28	#define UIO_MAXIOV	1024
    29	
    30	
    31	#endif /* __LINUX_UIO_H */