/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2016 Joyent, Inc.
 */

/*
 * Header file to support the signalfd facility. Note that this facility
 * is designed to be binary compatible with the Linux signalfd facility, modulo
 * the signals themselves; values for constants here should therefore exactly
 * match those found in Linux, and this facility shouldn't be extended
 * independently of Linux.
 */

#ifndef _SYS_SIGNALFD_H
#define _SYS_SIGNALFD_H

#include <sys/types.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * To assure binary compatibility with Linux, these values are fixed at their
 * Linux equivalents, not their native ones.
 */
#define SFD_CLOEXEC             02000000                /* LX_O_CLOEXEC */
#define SFD_NONBLOCK            04000                   /* LX_O_NONBLOCK */

/*
 * These ioctl values are specific to the native implementation; applications
 * shouldn't be using them directly, and they should therefore be safe to
 * change without breaking apps.
 */
#define SIGNALFDIOC             (('s' << 24) | ('f' << 16) | ('d' << 8))
#define SIGNALFDIOC_MASK        (SIGNALFDIOC | 1)       /* set mask */

typedef struct signalfd_siginfo {
        uint32_t ssi_signo;     /* signal from signal.h */
        int32_t  ssi_errno;     /* error from errno.h */
        int32_t  ssi_code;      /* signal code */
        uint32_t ssi_pid;       /* PID of sender */
        uint32_t ssi_uid;       /* real UID of sender */
        int32_t  ssi_fd;        /* File descriptor (SIGIO) */
        uint32_t ssi_tid;       /* unused */
        uint32_t ssi_band;      /* band event (SIGIO) */
        uint32_t ssi_overrun;   /* unused */
        uint32_t ssi_trapno;    /* trap number that caused signal */
        int32_t  ssi_status;    /* exit status or signal (SIGCHLD) */
        int32_t  ssi_int;       /* unused */
        uint64_t ssi_ptr;       /* unused */
        uint64_t ssi_utime;     /* user CPU time consumed (SIGCHLD) */
        uint64_t ssi_stime;     /* system CPU time consumed (SIGCHLD) */
        uint64_t ssi_addr;      /* address that generated signal */
        uint8_t  ssi_pad[48];   /* Pad size to 128 bytes to allow for */
                                /* additional fields in the future. */
} signalfd_siginfo_t;

#ifndef _KERNEL

extern int signalfd(int, const sigset_t *, int);

#else

#define SIGNALFDMNRN_SIGNALFD   0
#define SIGNALFDMNRN_CLONE      1

/*
 * This holds the proc_t state for a process which is using signalfd.
 * Its presence and contents are protected by p_lock.
 */
typedef struct sigfd_proc_state {
        void (*sigfd_pollwake_cb)(void *, int);
        list_t sigfd_list;
} sigfd_proc_state_t;


extern void (*sigfd_exit_helper)();

#endif /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_SIGNALFD_H */