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The C and C++ Include Header Files

/usr/include/linux/un.h


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

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_UN_H
     3	#define _LINUX_UN_H
     4	
     5	#include <linux/socket.h>
     6	
     7	#define UNIX_PATH_MAX	108
     8	
     9	struct sockaddr_un {
    10		__kernel_sa_family_t sun_family; /* AF_UNIX */
    11		char sun_path[UNIX_PATH_MAX];	/* pathname */
    12	};
    13	
    14	#define SIOCUNIXFILE (SIOCPROTOPRIVATE + 0) /* open a socket file with O_PATH */
    15	
    16	#endif /* _LINUX_UN_H */