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The C and C++ Include Header Files

cat -n /usr/include/linux/mmc/ioctl.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef LINUX_MMC_IOCTL_H
     3	#define LINUX_MMC_IOCTL_H
     4	
     5	#include <linux/types.h>
     6	#include <linux/major.h>
     7	
     8	struct mmc_ioc_cmd {
     9		/*
    10		 * Direction of data: nonzero = write, zero = read.
    11		 * Bit 31 selects 'Reliable Write' for RPMB.
    12		 */
    13		int write_flag;
    14	
    15		/* Application-specific command.  true = precede with CMD55 */
    16		int is_acmd;
    17	
    18		__u32 opcode;
    19		__u32 arg;
    20		__u32 response[4];  /* CMD response */
    21		unsigned int flags;
    22		unsigned int blksz;
    23		unsigned int blocks;
    24	
    25		/*
    26		 * Sleep at least postsleep_min_us useconds, and at most
    27		 * postsleep_max_us useconds *after* issuing command.  Needed for
    28		 * some read commands for which cards have no other way of indicating
    29		 * they're ready for the next command (i.e. there is no equivalent of
    30		 * a "busy" indicator for read operations).
    31		 */
    32		unsigned int postsleep_min_us;
    33		unsigned int postsleep_max_us;
    34	
    35		/*
    36		 * Override driver-computed timeouts.  Note the difference in units!
    37		 */
    38		unsigned int data_timeout_ns;
    39		unsigned int cmd_timeout_ms;
    40	
    41		/*
    42		 * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
    43		 * be 8-byte aligned.  Make sure this struct is the same size when
    44		 * built for 32-bit.
    45		 */
    46		__u32 __pad;
    47	
    48		/* DAT buffer */
    49		__u64 data_ptr;
    50	};
    51	#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
    52	
    53	/**
    54	 * struct mmc_ioc_multi_cmd - multi command information
    55	 * @num_of_cmds: Number of commands to send. Must be equal to or less than
    56	 *	MMC_IOC_MAX_CMDS.
    57	 * @cmds: Array of commands with length equal to 'num_of_cmds'
    58	 */
    59	struct mmc_ioc_multi_cmd {
    60		__u64 num_of_cmds;
    61		struct mmc_ioc_cmd cmds[];
    62	};
    63	
    64	#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
    65	/*
    66	 * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
    67	 *	the structure mmc_ioc_multi_cmd. The MMC driver will issue all
    68	 *	commands in array in sequence to card.
    69	 */
    70	#define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
    71	/*
    72	 * Since this ioctl is only meant to enhance (and not replace) normal access
    73	 * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
    74	 * is enforced per ioctl call.  For larger data transfers, use the normal
    75	 * block device operations.
    76	 */
    77	#define MMC_IOC_MAX_BYTES  (512L * 1024)
    78	#define MMC_IOC_MAX_CMDS    255
    79	#endif /* LINUX_MMC_IOCTL_H */