10.3. Data Definitions for libc

This section defines global identifiers and their values that are associated with interfaces contained in libc. These definitions are organized into groups that correspond to system headers. This convention is used as a convenience for the reader, and does not imply the existence of these headers, or their content. Where an interface is defined as requiring a particular system header file all of the data definitions for that system header file presented here shall be in effect.

This section gives data definitions to promote binary application portability, not to repeat source interface definitions available elsewhere. System providers and application developers should use this ABI to supplement - not to replace - source interface definition specifications.

This specification uses the ISO C (1999) C Language as the reference programming language, and data definitions are specified in ISO C format. The C language is used here as a convenient notation. Using a C language description of these data objects does not preclude their use by other programming languages.

10.3.1. argz.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.2. assert.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.3. cpio.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.4. ctype.h


enum {
    _ISupper = 256,
    _ISlower = 512,
    _ISalpha = 1024,
    _ISdigit = 2048,
    _ISxdigit = 4096,
    _ISspace = 8192,
    _ISprint = 16384,
    _ISgraph = 32768,
    _ISblank = 1,
    _IScntrl = 2,
    _ISpunct = 4,
    _ISalnum = 8
};

10.3.5. dirent.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.6. elf.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.7. endian.h


#define __BYTE_ORDER	__LITTLE_ENDIAN

10.3.8. errno.h


#define EDEADLOCK	EDEADLK

10.3.9. fcntl.h


#define O_LARGEFILE	0100000
#define O_DIRECTORY	0200000
#define O_NOFOLLOW	0400000
#define POSIX_FADV_DONTNEED	4
#define POSIX_FADV_NOREUSE	5

#define F_GETLK64	12
#define F_SETLK64	13
#define F_SETLKW64	14

10.3.10. fmtmsg.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.11. fnmatch.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.12. ftw.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.13. getopt.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.14. glob.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.15. iconv.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.16. ifaddrs.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.17. inttypes.h


#define __PRIPTR_PREFIX
#define __PRI64_PREFIX	"ll"

typedef lldiv_t imaxdiv_t;

10.3.18. langinfo.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.19. limits.h


#define LONG_MAX	0x7FFFFFFFL
#define ULONG_MAX	0xFFFFFFFFUL
#define LONG_BIT	32

#define CHAR_MAX	SCHAR_MAX
#define CHAR_MIN	SCHAR_MIN

#define PTHREAD_STACK_MIN	16384

10.3.20. link.h


struct dl_phdr_info {
    Elf32_Addr dlpi_addr;
    const char *dlpi_name;
    const Elf32_Phdr *dlpi_phdr;
    Elf32_Half dlpi_phnum;
    unsigned long long int dlpi_adds;
    unsigned long long int dlpi_subs;
    size_t dlpi_tls_modid;
    void *dlpi_tls_data;
};

10.3.21. locale.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.22. lsb/time.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.23. lsb/types.h


typedef int32_t ssize_t;

10.3.24. lsb/wchar.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.25. net/if.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.26. netdb.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.27. netinet/icmp6.h


#define ND_NA_FLAG_OVERRIDE	0x00000020
#define ND_NA_FLAG_SOLICITED	0x00000040
#define ND_NA_FLAG_ROUTER	0x00000080
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN	0x0010
#define ICMP6_RR_RESULT_FLAGS_OOB	0x0020

10.3.28. netinet/igmp.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.29. netinet/in.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.30. netinet/in_systm.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.31. netinet/ip.h


struct timestamp {
    u_int8_t len;
    u_int8_t ptr;
    unsigned int flags:4;
    unsigned int overflow:4;
    u_int32_t data[9];
};
struct iphdr {
    unsigned int ihl:4;
    unsigned int version:4;
    u_int8_t tos;
    u_int16_t tot_len;
    u_int16_t id;
    u_int16_t frag_off;
    u_int8_t ttl;
    u_int8_t protocol;
    u_int16_t check;
    u_int32_t saddr;
    u_int32_t daddr;
};
struct ip {
    unsigned int ip_hl:4;
    unsigned int ip_v:4;
    u_int8_t ip_tos;
    u_short ip_len;
    u_short ip_id;
    u_short ip_off;
    u_int8_t ip_ttl;
    u_int8_t ip_p;
    u_short ip_sum;
    struct in_addr ip_src;
    struct in_addr ip_dst;
};
struct ip_timestamp {
    u_int8_t ipt_code;
    u_int8_t ipt_len;
    u_int8_t ipt_ptr;
    unsigned int ipt_flg:4;
    unsigned int ipt_oflw:4;
    u_int32_t data[9];
};

10.3.32. netinet/ip6.h


#define IP6_ALERT_MLD	0x0000
#define IP6F_MORE_FRAG	0x0100
#define IP6_ALERT_RSVP	0x0100
#define IP6_ALERT_AN	0x0200
#define IP6F_RESERVED_MASK	0x0600
#define IP6F_OFF_MASK	0xf8ff

10.3.33. netinet/ip_icmp.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.34. netinet/tcp.h


struct tcphdr {
    uint16_t source;
    uint16_t dest;
    uint32_t seq;
    uint32_t ack_seq;
    uint16_t res1:4;
    uint16_t doff:4;
    uint16_t fin:1;
    uint16_t syn:1;
    uint16_t rst:1;
    uint16_t psh:1;
    uint16_t ack:1;
    uint16_t urg:1;
    uint16_t res2:2;
    uint16_t window;
    uint16_t check;
    uint16_t urg_ptr;
};

10.3.35. netinet/udp.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.36. nl_types.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.37. pwd.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.38. regex.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.39. rpc/auth.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.40. rpc/clnt.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.41. rpc/rpc_msg.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.42. rpc/svc.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.43. rpc/types.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.44. rpc/xdr.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.45. sched.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.46. search.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.47. setjmp.h


typedef int __jmp_buf[6];

10.3.48. signal.h


#define SIGEV_PAD_SIZE	((SIGEV_MAX_SIZE/sizeof(int))-3)

#define SI_PAD_SIZE	((SI_MAX_SIZE/sizeof(int))-3)

struct sigaction {
    union {
	sighandler_t _sa_handler;
	void (*_sa_sigaction) (int, siginfo_t *, void *);
    } __sigaction_handler;
    sigset_t sa_mask;
    unsigned long int sa_flags;
    void (*sa_restorer) (void);
};

#define MINSIGSTKSZ	2048	/* Minimum stack size for a signal handler. */
#define SIGSTKSZ	8192	/* System default stack size. */

struct _fpreg {
    unsigned short significand[4];
    unsigned short exponent;
};
struct _fpxreg {
    unsigned short significand[4];
    unsigned short exponent;
    unsigned short padding[3];
};
struct _xmmreg {
    unsigned long int element[4];
};

struct _fpstate {
    unsigned long int cw;
    unsigned long int sw;
    unsigned long int tag;
    unsigned long int ipoff;
    unsigned long int cssel;
    unsigned long int dataoff;
    unsigned long int datasel;
    struct _fpreg _st[8];
    unsigned short status;
    unsigned short magic;
    unsigned long int _fxsr_env[6];
    unsigned long int mxcsr;
    unsigned long int reserved;
    struct _fpxreg _fxsr_st[8];
    struct _xmmreg _xmm[8];
    unsigned long int padding1[44];
    __extension__ union {
	unsigned long int padding2[12];
	struct _fpx_sw_bytes sw_reserved;
    };
};

struct sigcontext {
    unsigned short gs;
    unsigned short __gsh;
    unsigned short fs;
    unsigned short __fsh;
    unsigned short es;
    unsigned short __esh;
    unsigned short ds;
    unsigned short __dsh;
    unsigned long int edi;
    unsigned long int esi;
    unsigned long int ebp;
    unsigned long int esp;
    unsigned long int ebx;
    unsigned long int edx;
    unsigned long int ecx;
    unsigned long int eax;
    unsigned long int trapno;
    unsigned long int err;
    unsigned long int eip;
    unsigned short cs;
    unsigned short __csh;
    unsigned long int eflags;
    unsigned long int esp_at_signal;
    unsigned short ss;
    unsigned short __ssh;
    struct _fpstate *fpstate;
    unsigned long int oldmask;
    unsigned long int cr2;
};

10.3.49. spawn.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.50. stddef.h


typedef long int wchar_t;
typedef unsigned int size_t;
typedef int ptrdiff_t;

10.3.51. stdint.h


#define INT64_C(c)	c ## LL
#define INTMAX_C(c)	c ## LL
#define __INT64_C(c)	c ## LL
#define UINT64_C(c)	c ## ULL
#define UINTMAX_C(c)	c ## ULL
#define __UINT64_C(c)	c ## ULL

#define INTPTR_MIN	(-2147483647-1)
#define INT_FAST16_MIN	(-2147483647-1)
#define INT_FAST32_MIN	(-2147483647-1)
#define PTRDIFF_MIN	(-2147483647-1)
#define INTPTR_MAX	(2147483647)
#define INT_FAST16_MAX	(2147483647)
#define INT_FAST32_MAX	(2147483647)
#define PTRDIFF_MAX	(2147483647)
#define SIZE_MAX	(4294967295U)
#define UINTPTR_MAX	(4294967295U)
#define UINT_FAST16_MAX	(4294967295U)
#define UINT_FAST32_MAX	(4294967295U)

typedef long long int int64_t;
typedef long long int intmax_t;
typedef unsigned long long int uintmax_t;
typedef int intptr_t;
typedef unsigned int uintptr_t;
typedef unsigned long long int uint64_t;
typedef long long int int_least64_t;
typedef unsigned long long int uint_least64_t;
typedef int int_fast16_t;
typedef int int_fast32_t;
typedef long long int int_fast64_t;
typedef unsigned int uint_fast16_t;
typedef unsigned int uint_fast32_t;
typedef unsigned long long int uint_fast64_t;

10.3.52. stdio.h


#define __IO_FILE_SIZE	148

10.3.53. stdlib.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.54. string.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.55. sys/epoll.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.56. sys/file.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.57. sys/inotify.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.58. sys/io.h


extern int ioperm(unsigned long int from, unsigned long int num,
		  int turn_on);
extern int iopl(int level);

10.3.59. sys/ioctl.h


#define TIOCGWINSZ	0x5413
#define TIOCSWINSZ	0x5414
#define FIONREAD	0x541B
#define TIOCNOTTY	0x5422

10.3.60. sys/ipc.h


struct ipc_perm {
    key_t __key;
    uid_t uid;
    gid_t gid;
    uid_t cuid;
    gid_t cgid;
    unsigned short mode;
    unsigned short __pad1;
    unsigned short __seq;
    unsigned short __pad2;
    unsigned long int __unused1;
    unsigned long int __unused2;
};

10.3.61. sys/mman.h


#define MCL_CURRENT	1
#define MCL_FUTURE	2

10.3.62. sys/msg.h


typedef unsigned long int msgqnum_t;
typedef unsigned long int msglen_t;

struct msqid_ds {
    struct ipc_perm msg_perm;	/* structure describing operation permission */
    time_t msg_stime;		/* time of last msgsnd command */
    unsigned long int __unused1;
    time_t msg_rtime;		/* time of last msgrcv command */
    unsigned long int __unused2;
    time_t msg_ctime;		/* time of last change */
    unsigned long int __unused3;
    unsigned long int __msg_cbytes;	/* current number of bytes on queue */
    msgqnum_t msg_qnum;		/* number of messages currently on queue */
    msglen_t msg_qbytes;	/* max number of bytes allowed on queue */
    pid_t msg_lspid;		/* pid of last msgsnd() */
    pid_t msg_lrpid;		/* pid of last msgrcv() */
    unsigned long int __unused4;
    unsigned long int __unused5;
};

10.3.63. sys/param.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.64. sys/poll.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.65. sys/ptrace.h


enum __ptrace_request {
    PTRACE_TRACEME = 0,
    PTRACE_PEEKTEXT = 1,
    PTRACE_PEEKDATA = 2,
    PTRACE_PEEKUSER = 3,
    PTRACE_POKETEXT = 4,
    PTRACE_POKEDATA = 5,
    PTRACE_POKEUSER = 6,
    PTRACE_CONT = 7,
    PTRACE_KILL = 8,
    PTRACE_SINGLESTEP = 9,
    PTRACE_GETREGS = 12,
    PTRACE_SETREGS = 13,
    PTRACE_GETFPREGS = 14,
    PTRACE_SETFPREGS = 15,
    PTRACE_ATTACH = 16,
    PTRACE_DETACH = 17,
    PTRACE_GETFPXREGS = 18,
    PTRACE_SETFPXREGS = 19,
    PTRACE_SYSCALL = 24,
    PTRACE_SETOPTIONS = 0x4200,
    PTRACE_GETEVENTMSG = 0x4201,
    PTRACE_GETSIGINFO = 0x4202,
    PTRACE_SETSIGINFO = 0x4203
};

10.3.66. sys/resource.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.67. sys/select.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.68. sys/sem.h


struct semid_ds {
    struct ipc_perm sem_perm;	/* operation permission struct */
    time_t sem_otime;		/* last semop() time */
    unsigned long int __unused1;
    time_t sem_ctime;		/* last time changed by semctl() */
    unsigned long int __unused2;
    unsigned long int sem_nsems;	/* number of semaphores in set */
    unsigned long int __unused3;
    unsigned long int __unused4;
};

10.3.69. sys/shm.h


#define SHMLBA	(__getpagesize())

typedef unsigned long int shmatt_t;

struct shmid_ds {
    struct ipc_perm shm_perm;
    int shm_segsz;
    time_t shm_atime;
    unsigned long int __unused1;
    time_t shm_dtime;
    unsigned long int __unused2;
    time_t shm_ctime;
    unsigned long int __unused3;
    pid_t shm_cpid;
    pid_t shm_lpid;
    shmatt_t shm_nattch;
    unsigned long int __unused4;
    unsigned long int __unused5;
};

10.3.70. sys/socket.h


typedef uint32_t __ss_aligntype;

#define SO_RCVLOWAT	18
#define SO_SNDLOWAT	19
#define SO_RCVTIMEO	20
#define SO_SNDTIMEO	21

10.3.71. sys/stat.h


#define _MKNOD_VER	1
#define _STAT_VER	3

struct stat {
    dev_t st_dev;
    unsigned short __pad1;
    unsigned long int st_ino;
    mode_t st_mode;
    nlink_t st_nlink;
    uid_t st_uid;
    gid_t st_gid;
    dev_t st_rdev;
    unsigned short __pad2;
    off_t st_size;
    blksize_t st_blksize;
    blkcnt_t st_blocks;
    struct timespec st_atim;	/* Time of last access. */
    struct timespec st_mtim;	/* Time of last modification. */
    struct timespec st_ctim;	/* Time of last status change. */
    unsigned long int __unused4;
    unsigned long int __unused5;
};
struct stat64 {
    dev_t st_dev;
    unsigned int __pad1;
    ino_t __st_ino;
    mode_t st_mode;
    nlink_t st_nlink;
    uid_t st_uid;
    gid_t st_gid;
    dev_t st_rdev;
    unsigned int __pad2;
    off64_t st_size;
    blksize_t st_blksize;
    blkcnt64_t st_blocks;
    struct timespec st_atim;	/* Time of last access. */
    struct timespec st_mtim;	/* Time of last modification. */
    struct timespec st_ctim;	/* Time of last status change. */
    ino64_t st_ino;
};

10.3.72. sys/statfs.h


struct statfs {
    int f_type;			/* type of filesystem */
    int f_bsize;		/* optimal transfer block size */
    fsblkcnt_t f_blocks;	/* total data blocks in file system */
    fsblkcnt_t f_bfree;		/* free blocks in fs */
    fsblkcnt_t f_bavail;	/* free blocks avail to non-superuser */
    fsfilcnt_t f_files;		/* total file nodes in file system */
    fsfilcnt_t f_ffree;		/* free file nodes in file system */
    fsid_t f_fsid;		/* file system id */
    int f_namelen;		/* maximum length of filenames */
    int f_frsize;		/* fragment size */
    int f_spare[5];		/* spare for later */
};
struct statfs64 {
    int f_type;			/* type of filesystem */
    int f_bsize;		/* optimal transfer block size */
    fsblkcnt64_t f_blocks;	/* total data blocks in file system */
    fsblkcnt64_t f_bfree;	/* free blocks in fs */
    fsblkcnt64_t f_bavail;	/* free blocks avail to non-superuser */
    fsfilcnt64_t f_files;	/* total file nodes in file system */
    fsfilcnt64_t f_ffree;	/* free file nodes in file system */
    fsid_t f_fsid;		/* file system id */
    int f_namelen;		/* maximum length of filenames */
    int f_frsize;		/* fragment size */
    int f_spare[5];		/* spare for later */
};

10.3.73. sys/statvfs.h


struct statvfs {
    unsigned long int f_bsize;
    unsigned long int f_frsize;
    fsblkcnt_t f_blocks;
    fsblkcnt_t f_bfree;
    fsblkcnt_t f_bavail;
    fsfilcnt_t f_files;
    fsfilcnt_t f_ffree;
    fsfilcnt_t f_favail;
    unsigned long int f_fsid;
    int __f_unused;
    unsigned long int f_flag;
    unsigned long int f_namemax;
    int __f_spare[6];
};
struct statvfs64 {
    unsigned long int f_bsize;
    unsigned long int f_frsize;
    fsblkcnt64_t f_blocks;
    fsblkcnt64_t f_bfree;
    fsblkcnt64_t f_bavail;
    fsfilcnt64_t f_files;
    fsfilcnt64_t f_ffree;
    fsfilcnt64_t f_favail;
    unsigned long int f_fsid;
    int __f_unused;
    unsigned long int f_flag;
    unsigned long int f_namemax;
    int __f_spare[6];
};

10.3.74. sys/sysinfo.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.75. sys/time.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.76. sys/timeb.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.77. sys/times.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.78. sys/un.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.79. sys/utsname.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.80. sys/wait.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.81. sysexits.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.82. syslog.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.83. tar.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.84. termios.h


#define OLCUC	0000002
#define ONLCR	0000004
#define XCASE	0000004
#define NLDLY	0000400
#define CR1	0001000
#define IUCLC	0001000
#define CR2	0002000
#define CR3	0003000
#define CRDLY	0003000
#define TAB1	0004000
#define TAB2	0010000
#define TAB3	0014000
#define TABDLY	0014000
#define BS1	0020000
#define BSDLY	0020000
#define VT1	0040000
#define VTDLY	0040000
#define FF1	0100000
#define FFDLY	0100000

#define VSUSP	10
#define VEOL	11
#define VREPRINT	12
#define VDISCARD	13
#define VWERASE	14
#define VEOL2	16
#define VMIN	6
#define VSWTC	7
#define VSTART	8
#define VSTOP	9

#define IXON	0002000
#define IXOFF	0010000

#define CS6	0000020
#define CS7	0000040
#define CS8	0000060
#define CSIZE	0000060
#define CSTOPB	0000100
#define CREAD	0000200
#define PARENB	0000400
#define PARODD	0001000
#define HUPCL	0002000
#define CLOCAL	0004000
#define VTIME	5

#define ISIG	0000001
#define ICANON	0000002
#define ECHOE	0000020
#define ECHOK	0000040
#define ECHONL	0000100
#define NOFLSH	0000200
#define TOSTOP	0000400
#define ECHOCTL	0001000
#define ECHOPRT	0002000
#define ECHOKE	0004000
#define FLUSHO	0010000
#define PENDIN	0040000
#define IEXTEN	0100000

10.3.85. time.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.86. ucontext.h


enum {
    REG_GS = 0,
    REG_FS = 1,
    REG_ES = 2,
    REG_DS = 3,
    REG_EDI = 4,
    REG_ESI = 5,
    REG_EBP = 6,
    REG_ESP = 7,
    REG_EBX = 8,
    REG_EDX = 9,
    REG_ECX = 10,
    REG_EAX = 11,
    REG_TRAPNO = 12,
    REG_ERR = 13,
    REG_EIP = 14,
    REG_CS = 15,
    REG_EFL = 16,
    REG_UESP = 17,
    REG_SS = 18
};

typedef int greg_t;

#define NGREG	19

typedef greg_t gregset_t[19];

struct _libc_fpreg {
    unsigned short significand[4];
    unsigned short exponent;
};

struct _libc_fpstate {
    unsigned long int cw;
    unsigned long int sw;
    unsigned long int tag;
    unsigned long int ipoff;
    unsigned long int cssel;
    unsigned long int dataoff;
    unsigned long int datasel;
    struct _libc_fpreg _st[8];
    unsigned long int status;
};
typedef struct _libc_fpstate *fpregset_t;

typedef struct {
    gregset_t gregs;
    fpregset_t fpregs;
    unsigned long int oldmask;
    unsigned long int cr2;
} mcontext_t;

typedef struct ucontext {
    unsigned long int uc_flags;
    struct ucontext *uc_link;
    stack_t uc_stack;
    mcontext_t uc_mcontext;
    sigset_t uc_sigmask;
    struct _libc_fpstate __fpregs_mem;
} ucontext_t;

10.3.87. ulimit.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.88. unistd.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.89. utime.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */

10.3.90. utmp.h


struct lastlog {
    time_t ll_time;
    char ll_line[UT_LINESIZE];
    char ll_host[UT_HOSTSIZE];
};

struct utmp {
    short ut_type;		/* Type of login. */
    pid_t ut_pid;		/* Process ID of login process. */
    char ut_line[UT_LINESIZE];	/* Devicename. */
    char ut_id[4];		/* Inittab ID. */
    char ut_user[UT_NAMESIZE];	/* Username. */
    char ut_host[UT_HOSTSIZE];	/* Hostname for remote login. */
    struct exit_status ut_exit;	/* Exit status of a process marked as DEAD_PROCESS. */
    long int ut_session;	/* Session ID, used for windowing. */
    struct timeval ut_tv;	/* Time entry was made. */
    int32_t ut_addr_v6[4];	/* Internet address of remote host. */
    char __unused[20];		/* Reserved for future use. */
};

10.3.91. utmpx.h


struct utmpx {
    short ut_type;		/* Type of login. */
    pid_t ut_pid;		/* Process ID of login process. */
    char ut_line[UT_LINESIZE];	/* Devicename. */
    char ut_id[4];		/* Inittab ID. */
    char ut_user[UT_NAMESIZE];	/* Username. */
    char ut_host[UT_HOSTSIZE];	/* Hostname for remote login. */
    struct exit_status ut_exit;	/* Exit status of a process marked as DEAD_PROCESS. */
    long int ut_session;	/* Session ID, used for windowing. */
    struct timeval ut_tv;	/* Time entry was made. */
    int32_t ut_addr_v6[4];	/* Internet address of remote host. */
    char __unused[20];		/* Reserved for future use. */
};

10.3.92. wordexp.h


/*
 * This header is architecture neutral
 * Please refer to the generic specification for details
 */