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The C and C++ Include Header Files
/usr/include/x86_64-linux-gnu/bits/socket.h
$ cat -n /usr/include/x86_64-linux-gnu/bits/socket.h 1 /* System-specific socket constants and types. Linux version. 2 Copyright (C) 1991-2024 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef __BITS_SOCKET_H 20 #define __BITS_SOCKET_H 21 22 #ifndef _SYS_SOCKET_H 23 # error "Never include <bits/socket.h> directly; use <sys/socket.h> instead." 24 #endif 25 26 #define __need_size_t 27 #include <stddef.h> 28 29 #include <sys/types.h> 30 31 /* Type for length arguments in socket calls. */ 32 #ifndef __socklen_t_defined 33 typedef __socklen_t socklen_t; 34 # define __socklen_t_defined 35 #endif 36 37 /* Get the architecture-dependent definition of enum __socket_type. */ 38 #include <bits/socket_type.h> 39 40 /* Protocol families. */ 41 #define PF_UNSPEC 0 /* Unspecified. */ 42 #define PF_LOCAL 1 /* Local to host (pipes and file-domain). */ 43 #define PF_UNIX PF_LOCAL /* POSIX name for PF_LOCAL. */ 44 #define PF_FILE PF_LOCAL /* Another non-standard name for PF_LOCAL. */ 45 #define PF_INET 2 /* IP protocol family. */ 46 #define PF_AX25 3 /* Amateur Radio AX.25. */ 47 #define PF_IPX 4 /* Novell Internet Protocol. */ 48 #define PF_APPLETALK 5 /* Appletalk DDP. */ 49 #define PF_NETROM 6 /* Amateur radio NetROM. */ 50 #define PF_BRIDGE 7 /* Multiprotocol bridge. */ 51 #define PF_ATMPVC 8 /* ATM PVCs. */ 52 #define PF_X25 9 /* Reserved for X.25 project. */ 53 #define PF_INET6 10 /* IP version 6. */ 54 #define PF_ROSE 11 /* Amateur Radio X.25 PLP. */ 55 #define PF_DECnet 12 /* Reserved for DECnet project. */ 56 #define PF_NETBEUI 13 /* Reserved for 802.2LLC project. */ 57 #define PF_SECURITY 14 /* Security callback pseudo AF. */ 58 #define PF_KEY 15 /* PF_KEY key management API. */ 59 #define PF_NETLINK 16 60 #define PF_ROUTE PF_NETLINK /* Alias to emulate 4.4BSD. */ 61 #define PF_PACKET 17 /* Packet family. */ 62 #define PF_ASH 18 /* Ash. */ 63 #define PF_ECONET 19 /* Acorn Econet. */ 64 #define PF_ATMSVC 20 /* ATM SVCs. */ 65 #define PF_RDS 21 /* RDS sockets. */ 66 #define PF_SNA 22 /* Linux SNA Project */ 67 #define PF_IRDA 23 /* IRDA sockets. */ 68 #define PF_PPPOX 24 /* PPPoX sockets. */ 69 #define PF_WANPIPE 25 /* Wanpipe API sockets. */ 70 #define PF_LLC 26 /* Linux LLC. */ 71 #define PF_IB 27 /* Native InfiniBand address. */ 72 #define PF_MPLS 28 /* MPLS. */ 73 #define PF_CAN 29 /* Controller Area Network. */ 74 #define PF_TIPC 30 /* TIPC sockets. */ 75 #define PF_BLUETOOTH 31 /* Bluetooth sockets. */ 76 #define PF_IUCV 32 /* IUCV sockets. */ 77 #define PF_RXRPC 33 /* RxRPC sockets. */ 78 #define PF_ISDN 34 /* mISDN sockets. */ 79 #define PF_PHONET 35 /* Phonet sockets. */ 80 #define PF_IEEE802154 36 /* IEEE 802.15.4 sockets. */ 81 #define PF_CAIF 37 /* CAIF sockets. */ 82 #define PF_ALG 38 /* Algorithm sockets. */ 83 #define PF_NFC 39 /* NFC sockets. */ 84 #define PF_VSOCK 40 /* vSockets. */ 85 #define PF_KCM 41 /* Kernel Connection Multiplexor. */ 86 #define PF_QIPCRTR 42 /* Qualcomm IPC Router. */ 87 #define PF_SMC 43 /* SMC sockets. */ 88 #define PF_XDP 44 /* XDP sockets. */ 89 #define PF_MCTP 45 /* Management component transport protocol. */ 90 #define PF_MAX 46 /* For now.. */ 91 92 /* Address families. */ 93 #define AF_UNSPEC PF_UNSPEC 94 #define AF_LOCAL PF_LOCAL 95 #define AF_UNIX PF_UNIX 96 #define AF_FILE PF_FILE 97 #define AF_INET PF_INET 98 #define AF_AX25 PF_AX25 99 #define AF_IPX PF_IPX 100 #define AF_APPLETALK PF_APPLETALK 101 #define AF_NETROM PF_NETROM 102 #define AF_BRIDGE PF_BRIDGE 103 #define AF_ATMPVC PF_ATMPVC 104 #define AF_X25 PF_X25 105 #define AF_INET6 PF_INET6 106 #define AF_ROSE PF_ROSE 107 #define AF_DECnet PF_DECnet 108 #define AF_NETBEUI PF_NETBEUI 109 #define AF_SECURITY PF_SECURITY 110 #define AF_KEY PF_KEY 111 #define AF_NETLINK PF_NETLINK 112 #define AF_ROUTE PF_ROUTE 113 #define AF_PACKET PF_PACKET 114 #define AF_ASH PF_ASH 115 #define AF_ECONET PF_ECONET 116 #define AF_ATMSVC PF_ATMSVC 117 #define AF_RDS PF_RDS 118 #define AF_SNA PF_SNA 119 #define AF_IRDA PF_IRDA 120 #define AF_PPPOX PF_PPPOX 121 #define AF_WANPIPE PF_WANPIPE 122 #define AF_LLC PF_LLC 123 #define AF_IB PF_IB 124 #define AF_MPLS PF_MPLS 125 #define AF_CAN PF_CAN 126 #define AF_TIPC PF_TIPC 127 #define AF_BLUETOOTH PF_BLUETOOTH 128 #define AF_IUCV PF_IUCV 129 #define AF_RXRPC PF_RXRPC 130 #define AF_ISDN PF_ISDN 131 #define AF_PHONET PF_PHONET 132 #define AF_IEEE802154 PF_IEEE802154 133 #define AF_CAIF PF_CAIF 134 #define AF_ALG PF_ALG 135 #define AF_NFC PF_NFC 136 #define AF_VSOCK PF_VSOCK 137 #define AF_KCM PF_KCM 138 #define AF_QIPCRTR PF_QIPCRTR 139 #define AF_SMC PF_SMC 140 #define AF_XDP PF_XDP 141 #define AF_MCTP PF_MCTP 142 #define AF_MAX PF_MAX 143 144 /* Socket level values. Others are defined in the appropriate headers. 145 146 XXX These definitions also should go into the appropriate headers as 147 far as they are available. */ 148 #define SOL_RAW 255 149 #define SOL_DECNET 261 150 #define SOL_X25 262 151 #define SOL_PACKET 263 152 #define SOL_ATM 264 /* ATM layer (cell level). */ 153 #define SOL_AAL 265 /* ATM Adaption Layer (packet level). */ 154 #define SOL_IRDA 266 155 #define SOL_NETBEUI 267 156 #define SOL_LLC 268 157 #define SOL_DCCP 269 158 #define SOL_NETLINK 270 159 #define SOL_TIPC 271 160 #define SOL_RXRPC 272 161 #define SOL_PPPOL2TP 273 162 #define SOL_BLUETOOTH 274 163 #define SOL_PNPIPE 275 164 #define SOL_RDS 276 165 #define SOL_IUCV 277 166 #define SOL_CAIF 278 167 #define SOL_ALG 279 168 #define SOL_NFC 280 169 #define SOL_KCM 281 170 #define SOL_TLS 282 171 #define SOL_XDP 283 172 #define SOL_MPTCP 284 173 #define SOL_MCTP 285 174 #define SOL_SMC 286 175 176 /* Maximum queue length specifiable by listen. */ 177 #define SOMAXCONN 4096 178 179 /* Get the definition of the macro to define the common sockaddr members. */ 180 #include <bits/sockaddr.h> 181 182 /* Structure describing a generic socket address. */ 183 struct sockaddr 184 { 185 __SOCKADDR_COMMON (sa_); /* Common data: address family and length. */ 186 char sa_data[14]; /* Address data. */ 187 }; 188 189 190 /* Structure large enough to hold any socket address (with the historical 191 exception of AF_UNIX). */ 192 #define __ss_aligntype unsigned long int 193 #define _SS_PADSIZE \ 194 (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype)) 195 196 struct sockaddr_storage 197 { 198 __SOCKADDR_COMMON (ss_); /* Address family, etc. */ 199 char __ss_padding[_SS_PADSIZE]; 200 __ss_aligntype __ss_align; /* Force desired alignment. */ 201 }; 202 203 204 /* Bits in the FLAGS argument to `send', `recv', et al. */ 205 enum 206 { 207 MSG_OOB = 0x01, /* Process out-of-band data. */ 208 #define MSG_OOB MSG_OOB 209 MSG_PEEK = 0x02, /* Peek at incoming messages. */ 210 #define MSG_PEEK MSG_PEEK 211 MSG_DONTROUTE = 0x04, /* Don't use local routing. */ 212 #define MSG_DONTROUTE MSG_DONTROUTE 213 #ifdef __USE_GNU 214 /* DECnet uses a different name. */ 215 MSG_TRYHARD = MSG_DONTROUTE, 216 # define MSG_TRYHARD MSG_DONTROUTE 217 #endif 218 MSG_CTRUNC = 0x08, /* Control data lost before delivery. */ 219 #define MSG_CTRUNC MSG_CTRUNC 220 MSG_PROXY = 0x10, /* Supply or ask second address. */ 221 #define MSG_PROXY MSG_PROXY 222 MSG_TRUNC = 0x20, 223 #define MSG_TRUNC MSG_TRUNC 224 MSG_DONTWAIT = 0x40, /* Nonblocking IO. */ 225 #define MSG_DONTWAIT MSG_DONTWAIT 226 MSG_EOR = 0x80, /* End of record. */ 227 #define MSG_EOR MSG_EOR 228 MSG_WAITALL = 0x100, /* Wait for a full request. */ 229 #define MSG_WAITALL MSG_WAITALL 230 MSG_FIN = 0x200, 231 #define MSG_FIN MSG_FIN 232 MSG_SYN = 0x400, 233 #define MSG_SYN MSG_SYN 234 MSG_CONFIRM = 0x800, /* Confirm path validity. */ 235 #define MSG_CONFIRM MSG_CONFIRM 236 MSG_RST = 0x1000, 237 #define MSG_RST MSG_RST 238 MSG_ERRQUEUE = 0x2000, /* Fetch message from error queue. */ 239 #define MSG_ERRQUEUE MSG_ERRQUEUE 240 MSG_NOSIGNAL = 0x4000, /* Do not generate SIGPIPE. */ 241 #define MSG_NOSIGNAL MSG_NOSIGNAL 242 MSG_MORE = 0x8000, /* Sender will send more. */ 243 #define MSG_MORE MSG_MORE 244 MSG_WAITFORONE = 0x10000, /* Wait for at least one packet to return.*/ 245 #define MSG_WAITFORONE MSG_WAITFORONE 246 MSG_BATCH = 0x40000, /* sendmmsg: more messages coming. */ 247 #define MSG_BATCH MSG_BATCH 248 MSG_ZEROCOPY = 0x4000000, /* Use user data in kernel path. */ 249 #define MSG_ZEROCOPY MSG_ZEROCOPY 250 MSG_FASTOPEN = 0x20000000, /* Send data in TCP SYN. */ 251 #define MSG_FASTOPEN MSG_FASTOPEN 252 253 MSG_CMSG_CLOEXEC = 0x40000000 /* Set close_on_exit for file 254 descriptor received through 255 SCM_RIGHTS. */ 256 #define MSG_CMSG_CLOEXEC MSG_CMSG_CLOEXEC 257 }; 258 259 260 /* Structure describing messages sent by 261 `sendmsg' and received by `recvmsg'. */ 262 struct msghdr 263 { 264 void *msg_name; /* Address to send to/receive from. */ 265 socklen_t msg_namelen; /* Length of address data. */ 266 267 struct iovec *msg_iov; /* Vector of data to send/receive into. */ 268 size_t msg_iovlen; /* Number of elements in the vector. */ 269 270 void *msg_control; /* Ancillary data (eg BSD filedesc passing). */ 271 size_t msg_controllen; /* Ancillary data buffer length. 272 !! The type should be socklen_t but the 273 definition of the kernel is incompatible 274 with this. */ 275 276 int msg_flags; /* Flags on received message. */ 277 }; 278 279 /* Structure used for storage of ancillary data object information. */ 280 struct cmsghdr 281 { 282 size_t cmsg_len; /* Length of data in cmsg_data plus length 283 of cmsghdr structure. 284 !! The type should be socklen_t but the 285 definition of the kernel is incompatible 286 with this. */ 287 int cmsg_level; /* Originating protocol. */ 288 int cmsg_type; /* Protocol specific type. */ 289 #if __glibc_c99_flexarr_available 290 __extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */ 291 #endif 292 }; 293 294 /* Ancillary data object manipulation macros. */ 295 #if __glibc_c99_flexarr_available 296 # define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data) 297 #else 298 # define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1)) 299 #endif 300 #define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg) 301 #define CMSG_FIRSTHDR(mhdr) \ 302 ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \ 303 ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) 0) 304 #define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \ 305 & (size_t) ~(sizeof (size_t) - 1)) 306 #define CMSG_SPACE(len) (CMSG_ALIGN (len) \ 307 + CMSG_ALIGN (sizeof (struct cmsghdr))) 308 #define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len)) 309 310 /* Given a length, return the additional padding necessary such that 311 len + __CMSG_PADDING(len) == CMSG_ALIGN (len). */ 312 #define __CMSG_PADDING(len) ((sizeof (size_t) \ 313 - ((len) & (sizeof (size_t) - 1))) \ 314 & (sizeof (size_t) - 1)) 315 316 extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr, 317 struct cmsghdr *__cmsg) __THROW; 318 #ifdef __USE_EXTERN_INLINES 319 # ifndef _EXTERN_INLINE 320 # define _EXTERN_INLINE __extern_inline 321 # endif 322 _EXTERN_INLINE struct cmsghdr * 323 __NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg)) 324 { 325 /* We may safely assume that __cmsg lies between __mhdr->msg_control and 326 __mhdr->msg_controllen because the user is required to obtain the first 327 cmsg via CMSG_FIRSTHDR, set its length, then obtain subsequent cmsgs 328 via CMSG_NXTHDR, setting lengths along the way. However, we don't yet 329 trust the value of __cmsg->cmsg_len and therefore do not use it in any 330 pointer arithmetic until we check its value. */ 331 332 unsigned char * __msg_control_ptr = (unsigned char *) __mhdr->msg_control; 333 unsigned char * __cmsg_ptr = (unsigned char *) __cmsg; 334 335 size_t __size_needed = sizeof (struct cmsghdr) 336 + __CMSG_PADDING (__cmsg->cmsg_len); 337 338 /* The current header is malformed, too small to be a full header. */ 339 if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr)) 340 return (struct cmsghdr *) 0; 341 342 /* There isn't enough space between __cmsg and the end of the buffer to 343 hold the current cmsg *and* the next one. */ 344 if (((size_t) 345 (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr) 346 < __size_needed) 347 || ((size_t) 348 (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr 349 - __size_needed) 350 < __cmsg->cmsg_len)) 351 352 return (struct cmsghdr *) 0; 353 354 /* Now, we trust cmsg_len and can use it to find the next header. */ 355 __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg 356 + CMSG_ALIGN (__cmsg->cmsg_len)); 357 return __cmsg; 358 } 359 #endif /* Use `extern inline'. */ 360 361 /* Socket level message types. This must match the definitions in 362 <linux/socket.h>. */ 363 enum 364 { 365 SCM_RIGHTS = 0x01 /* Transfer file descriptors. */ 366 #define SCM_RIGHTS SCM_RIGHTS 367 #ifdef __USE_GNU 368 , SCM_CREDENTIALS = 0x02 /* Credentials passing. */ 369 # define SCM_CREDENTIALS SCM_CREDENTIALS 370 , SCM_SECURITY = 0x03 /* Security label. */ 371 # define SCM_SECURITY SCM_SECURITY 372 , SCM_PIDFD = 0x04 /* Pidfd. */ 373 # define SCM_PIDFD SCM_PIDFD 374 #endif 375 }; 376 377 #ifdef __USE_GNU 378 /* User visible structure for SCM_CREDENTIALS message */ 379 struct ucred 380 { 381 pid_t pid; /* PID of sending process. */ 382 uid_t uid; /* UID of sending process. */ 383 gid_t gid; /* GID of sending process. */ 384 }; 385 #endif 386 387 #ifdef __USE_MISC 388 # include <bits/types/time_t.h> 389 # include <asm/socket.h> 390 #else 391 # define SO_DEBUG 1 392 # include <bits/socket-constants.h> 393 #endif 394 395 /* Structure used to manipulate the SO_LINGER option. */ 396 struct linger 397 { 398 int l_onoff; /* Nonzero to linger on close. */ 399 int l_linger; /* Time to linger. */ 400 }; 401 402 #endif /* bits/socket.h */
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