一些IPC常用头文件

//my_err.h
#include <errno.h> /* for definition of errno */
#include <stdarg.h> /* ISO C variable aruments */

static void err_doit(int, int, const char *, va_list);

/*
 * Nonfatal error related to a system call.
 * Print a message and return.
 */
void err_ret(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, errno, fmt, ap);
    va_end(ap);
}


/*
 * Fatal error related to a system call.
 * Print a message and terminate.
 */
void err_sys(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, errno, fmt, ap);
    va_end(ap);
    exit(1);
}


/*
 * Fatal error unrelated to a system call.
 * Error code passed as explict parameter.
 * Print a message and terminate.
 */
void err_exit(int error, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, error, fmt, ap);
    va_end(ap);
    exit(1);
}


/*
 * Fatal error related to a system call.
 * Print a message, dump core, and terminate.
 */
void err_dump(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(1, errno, fmt, ap);
    va_end(ap);
    abort(); /* dump core and terminate */
    exit(1); /* shouldn‘t get here */
}


/*
 * Nonfatal error unrelated to a system call.
 * Print a message and return.
 */
void err_msg(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(0, 0, fmt, ap);
    va_end(ap);
}


/*
 * Fatal error unrelated to a system call.
 * Print a message and terminate.
 */
void err_quit(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    err_doit(0, 0, fmt, ap);
    va_end(ap);
    exit(1);
}


/*
 * Print a message and return to caller.
 * Caller specifies "errnoflag".
 */
static void err_doit(int errnoflag, int error, const char *fmt, va_list ap)
{
   char buf[MAXLINE];
   vsnprintf(buf, MAXLINE, fmt, ap);
   if (errnoflag)
       snprintf(buf+strlen(buf), MAXLINE-strlen(buf), ": %s",
         strerror(error));
   strcat(buf, "\n");
   fflush(stdout); /* in case stdout and stderr are the same */
   fputs(buf, stderr);
   fflush(NULL); /* flushes all stdio output streams */
}

//unpipc.h
/* include unpipch */
/* Our own header.  Tabs are set for 4 spaces, not 8 */

#ifndef    __unpipc_h
#define    __unpipc_h

#include    "./config.h"    /* configuration options for current OS */
                            /* "../config.h" is generated by configure */

/* If anything changes in the following list of #includes, must change
   ../aclocal.m4 and ../configure.in also, for configure‘s tests. */

#include    <sys/types.h>    /* basic system data types */
#include    <sys/time.h>    /* timeval{} for select() */
#include    <time.h>        /* timespec{} for pselect() */
#include    <errno.h>
#include    <fcntl.h>        /* for nonblocking */
#include    <limits.h>        /* PIPE_BUF */
#include    <signal.h>
#include    <stdio.h>
#include    <stdlib.h>
#include    <string.h>
#include    <sys/stat.h>    /* for S_xxx file mode constants */
#include    <unistd.h>
#include    <sys/wait.h>

#ifdef    HAVE_MQUEUE_H
# include    <mqueue.h>        /* Posix message queues */
#endif

#ifdef    HAVE_SEMAPHORE_H
# include    <semaphore.h>    /* Posix semaphores */

#ifndef    SEM_FAILED
#define    SEM_FAILED    ((sem_t *)(-1))
#endif

#endif

#ifdef    HAVE_SYS_MMAN_H
# include    <sys/mman.h>    /* Posix shared memory */
#endif

#ifndef    MAP_FAILED
#define    MAP_FAILED    ((void *)(-1))
#endif

#ifdef    HAVE_SYS_IPC_H
# include    <sys/ipc.h>        /* System V IPC */
#endif

#ifdef    HAVE_SYS_MSG_H
# include    <sys/msg.h>        /* System V message queues */
#endif

#ifdef    HAVE_SYS_SEM_H
#ifdef    __bsdi__
#undef    HAVE_SYS_SEM_H        /* hack: BSDI‘s semctl() prototype is wrong */
#else
# include    <sys/sem.h>        /* System V semaphores */
#endif

#ifndef    HAVE_SEMUN_UNION
/* $$.It semun$$ */
union semun {                /* define union for semctl() */
  int              val;
  struct semid_ds *buf;
  unsigned short  *array;
};
#endif
#endif    /* HAVE_SYS_SEM_H */

#ifdef    HAVE_SYS_SHM_H
# include    <sys/shm.h>        /* System V shared memory */
#endif

#ifdef    HAVE_SYS_SELECT_H
# include    <sys/select.h>    /* for convenience */
#endif

#ifdef    HAVE_POLL_H
# include    <poll.h>        /* for convenience */
#endif

#ifdef    HAVE_STROPTS_H
# include    <stropts.h>        /* for convenience */
#endif

#ifdef    HAVE_STRINGS_H
# include    <strings.h>        /* for convenience */
#endif

/* Next three headers are normally needed for socket/file ioctl‘s:
 * <sys/ioctl.h>, <sys/filio.h>, and <sys/sockio.h>.
 */
#ifdef    HAVE_SYS_IOCTL_H
# include    <sys/ioctl.h>
#endif
#ifdef    HAVE_SYS_FILIO_H
# include    <sys/filio.h>
#endif

#ifdef    HAVE_PTHREAD_H
# include    <pthread.h>
#endif

#ifdef    HAVE_DOOR_H
# include    <door.h>        /* Solaris doors API */
#endif

#ifdef    HAVE_RPC_RPC_H
#ifdef _PSX4_NSPACE_H_TS    /* Digital Unix 4.0b hack, hack, hack */
#undef    SUCCESS
#endif
# include    <rpc/rpc.h>        /* Sun RPC */
#endif

/* Define bzero() as a macro if it‘s not in standard C library. */
#ifndef    HAVE_BZERO
#define    bzero(ptr,n)        memset(ptr, 0, n)
#endif

/* Posix.1g requires that an #include of <poll.h> DefinE INFTIM, but many
   systems still DefinE it in <sys/stropts.h>.  We don‘t want to include
   all the streams stuff if it‘s not needed, so we just DefinE INFTIM here.
   This is the standard value, but there‘s no guarantee it is -1. */
#ifndef INFTIM
#define INFTIM          (-1)    /* infinite poll timeout */
#ifdef    HAVE_POLL_H
#define    INFTIM_UNPH                /* tell unpxti.h we defined it */
#endif
#endif

/* Miscellaneous constants */
#ifndef    PATH_MAX            /* should be in <limits.h> */
#define    PATH_MAX    1024    /* max # of characters in a pathname */
#endif

#define    MAX_PATH    1024
/* $$.ix [MAX_PATH]~constant,~definition~of$$ */
#define    MAXLINE        4096    /* max text line length */
/* $$.ix [MAXLINE]~constant,~definition~of$$ */
/* $$.ix [BUFFSIZE]~constant,~definition~of$$ */
#define    BUFFSIZE    8192    /* buffer size for reads and writes */

#define    FILE_MODE    (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
                    /* default permissions for new files */
/* $$.ix [FILE_MODE]~constant,~definition~of$$ */
#define    DIR_MODE    (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)
                    /* default permissions for new directories */
/* $$.ix [DIR_MODE]~constant,~definition~of$$ */

#define    SVMSG_MODE    (MSG_R | MSG_W | MSG_R>>3 | MSG_R>>6)
                    /* default permissions for new SV message queues */
/* $$.ix [SVMSG_MODE]~constant,~definition~of$$ */
#define    SVSEM_MODE    (SEM_R | SEM_A | SEM_R>>3 | SEM_R>>6)
                    /* default permissions for new SV semaphores */
/* $$.ix [SVSEM_MODE]~constant,~definition~of$$ */
#define    SVSHM_MODE    (SHM_R | SHM_W | SHM_R>>3 | SHM_R>>6)
                    /* default permissions for new SV shared memory */
/* $$.ix [SVSHM_MODE]~constant,~definition~of$$ */

typedef    void    Sigfunc(int);    /* for signal handlers */

#ifdef    HAVE_SIGINFO_T_STRUCT
typedef    void    Sigfunc_rt(int, siginfo_t *, void *);
#endif

#define    min(a,b)    ((a) < (b) ? (a) : (b))
#define    max(a,b)    ((a) > (b) ? (a) : (b))

#ifndef    HAVE_TIMESPEC_STRUCT
struct timespec {
  time_t    tv_sec;        /* seconds */
  long        tv_nsec;    /* and nanoseconds */
};
/* $$.It timespec$$ */
/* $$.Ib tv_sec$$ */
/* $$.Ib tv_nsec$$ */
#endif

/*
 * In our wrappers for open(), mq_open(), and sem_open() we handle the
 * optional arguments using the va_XXX() macros.  But one of the optional
 * arguments is of type "mode_t" and this breaks under BSD/OS because it
 * uses a 16-bit integer for this datatype.  But when our wrapper function
 * is called, the compiler expands the 16-bit short integer to a 32-bit
 * integer.  This breaks our call to va_arg().  All we can do is the
 * following hack.  Other systems in addition to BSD/OS might have this
 * problem too ...
 */

#ifdef    __bsdi__
#define    va_mode_t    int
#else
#define    va_mode_t    mode_t
#endif
/* $$.ix [va_mode_t]~datatype,~definition~of$$ */

        /* our record locking macros */
#define    read_lock(fd, offset, whence, len) \
            lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len)
#define    readw_lock(fd, offset, whence, len) \
            lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len)
#define    write_lock(fd, offset, whence, len) \
            lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len)
#define    writew_lock(fd, offset, whence, len) \
            lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len)
#define    un_lock(fd, offset, whence, len) \
            lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len)
#define    is_read_lockable(fd, offset, whence, len) \
            lock_test(fd, F_RDLCK, offset, whence, len)
#define    is_write_lockable(fd, offset, whence, len) \
            lock_test(fd, F_WRLCK, offset, whence, len)
/* end unpipch */

#define    Read_lock(fd, offset, whence, len) \
            Lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len)
#define    Readw_lock(fd, offset, whence, len) \
            Lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len)
#define    Write_lock(fd, offset, whence, len) \
            Lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len)
#define    Writew_lock(fd, offset, whence, len) \
            Lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len)
#define    Un_lock(fd, offset, whence, len) \
            Lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len)
#define    Is_read_lockable(fd, offset, whence, len) \
            Lock_test(fd, F_RDLCK, offset, whence, len)
#define    Is_write_lockable(fd, offset, whence, len) \
            Lock_test(fd, F_WRLCK, offset, whence, len)

            /* prototypes for our own library functions */
void     daemon_init(const char *, int);
void     daemon_inetd(const char *, int);
char    *gf_time(void);
int         lock_reg(int, int, int, off_t, int, off_t);
pid_t     lock_test(int, int, off_t, int, off_t);
void    *my_shm(size_t);
char    *px_ipc_name(const char *);
int         readable_timeo(int, int);
ssize_t     readline(int, void *, size_t);
ssize_t     readn(int, void *, size_t);
int         set_concurrency(int);
Sigfunc *signal_intr(int, Sigfunc *);
int          sleep_us(unsigned int);
int         start_time(void);
double     stop_time(void);
int         touch(void *, int);
void     tv_sub(struct timeval *, struct timeval *);
int         writable_timeo(int, int);
ssize_t     writen(int, const void *, size_t);

#ifndef    HAVE_GETHOSTNAME_PROTO
int         gethostname(char *, int);
#endif

#ifndef    HAVE_ISFDTYPE_PROTO
int         isfdtype(int, int);
#endif

#ifndef    HAVE_PSELECT_PROTO
int         pselect(int, fd_set *, fd_set *, fd_set *,
                 const struct timespec *, const sigset_t *);
#endif

#ifndef    HAVE_SNPRINTF_PROTO
int         snprintf(char *, size_t, const char *, ...);
#endif

            /* prototypes for our own library wrapper functions */
char    *Gf_time(void);
void     Lock_reg(int, int, int, off_t, int, off_t);
pid_t     Lock_test(int, int, off_t, int, off_t);
void    *My_shm(size_t);
char    *Px_ipc_name(const char *);
int         Readable_timeo(int, int);
ssize_t     Readline(int, void *, size_t);
ssize_t     Readn(int, void *, size_t);
void     Set_concurrency(int);
Sigfunc *Signal(int, Sigfunc *);
Sigfunc *Signal_intr(int, Sigfunc *);

#ifdef    HAVE_SIGINFO_T_STRUCT
Sigfunc_rt *Signal_rt(int, Sigfunc_rt *);
Sigfunc_rt *Signal_rt_intr(int, Sigfunc_rt *);
#endif

void     Sleep_us(unsigned int);
void     Start_time(void);
double     Stop_time(void);
void     Touch(void *, int);
int         Writable_timeo(int, int);
void     Writen(int, void *, size_t);

            /* prototypes for our Unix wrapper functions */
void    *Calloc(size_t, size_t);
void     Close(int);
void     Dup2(int, int);
int         Fcntl(int, int, void *);
pid_t     Fork(void);
long     Fpathconf(int, int);
void     Fstat(int, struct stat *);
key_t     Ftok(const char *, int);
void     Ftruncate(int, off_t);
int         Getopt(int, char *const *, const char *);
void     Gettimeofday(struct timeval *, void *);
int         Ioctl(int, int, void *);
void     Kill(pid_t, int);
off_t     Lseek(int, off_t, int);
void    *Malloc(size_t);
void     Mkfifo(const char *, mode_t);
void     Mktemp(char *);
void    *Mmap(void *, size_t, int, int, int, off_t);
void     Munmap(void *, size_t);
int         Open(const char *, int, ...);
long     Pathconf(const char *, int);
void     Pipe(int *fds);
ssize_t     Read(int, void *, size_t);
int         Select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
void     Sigaddset(sigset_t *, int);
void     Sigdelset(sigset_t *, int);
void     Sigemptyset(sigset_t *);
void     Sigfillset(sigset_t *);
int         Sigismember(const sigset_t *, int);
void     Sigpending(sigset_t *);
void     Sigprocmask(int, const sigset_t *, sigset_t *);
#ifdef    HAVE_SIGINFO_T_STRUCT
void     Sigqueue(pid_t, int, const union sigval);
#endif
#ifdef    HAVE_SIGWAIT
void     Sigwait(const sigset_t *, int *);
#endif
void     Stat(const char *, struct stat *);
char    *Strdup(const char *);
long     Sysconf(int);
void     Sysctl(int *, u_int, void *, size_t *, void *, size_t);
void     Unlink(const char *);
void    *Valloc(size_t);
pid_t     Wait(int *);
pid_t     Waitpid(pid_t, int *, int);
void     Write(int, void *, size_t);

#ifdef    HAVE_MQUEUE_H
            /* 4Posix message queues */
mqd_t     Mq_open(const char *, int, ...);
void     Mq_close(mqd_t);
void     Mq_unlink(const char *pathname);
void     Mq_send(mqd_t, const char *, size_t, unsigned int);
ssize_t     Mq_receive(mqd_t, char *, size_t, unsigned int *);
void     Mq_notify(mqd_t, const struct sigevent *);
void     Mq_getattr(mqd_t, struct mq_attr *);
void     Mq_setattr(mqd_t, const struct mq_attr *, struct mq_attr *);
#endif    /* HAVE_MQUEUE_H */

#ifdef    HAVE_SEMAPHORE_H
            /* 4Posix semaphores */
sem_t    *Sem_open(const char *, int, ...);
void     Sem_close(sem_t *);
void     Sem_unlink(const char *);
void     Sem_init(sem_t *, int, unsigned int);
void     Sem_destroy(sem_t *);
void     Sem_wait(sem_t *);
int         Sem_trywait(sem_t *);
void     Sem_post(sem_t *);
void     Sem_getvalue(sem_t *, int *);
#endif    /* HAVE_SEMAPHORE_H */

/* Note that <sys/mman.h> is defined on some systems that do not support
 * Posix shared memory (e.g., 4.4BSD), because this header predates Posix
 * and appears on any system that supports mmap().  Therefore we cannot
 * use this to determine whether the implementation supports Posix shared
 * memory or not.  We use our own HAVE_SHM_OPEN_PROTO symbol.
 */

#ifdef    HAVE_SHM_OPEN_PROTO
            /* 4Posix shared memory */
int         Shm_open(const char *, int, mode_t);
void     Shm_unlink(const char *);
#endif

#ifdef    HAVE_SYS_MSG_H
            /* 4System V message queues */
int         Msgget(key_t key, int flag);
void     Msgctl(int, int, struct msqid_ds *);
void     Msgsnd(int, const void *, size_t, int);
ssize_t     Msgrcv(int, void *, size_t, int, int);
#endif    /* HAVE_SYS_MSG_H */

#ifdef    HAVE_SYS_SEM_H
            /* 4System V semaphores */
int         Semget(key_t, int, int);
int         Semctl(int, int, int, ...);
void     Semop(int, struct sembuf *, size_t);
#endif    /* HAVE_SYS_SEM_H */

#ifdef    HAVE_SYS_SHM_H
            /* 4System V shared memory */
int         Shmget(key_t, size_t, int);
void    *Shmat(int, const void *, int);
void     Shmdt(const void *);
void     Shmctl(int, int, struct shmid_ds *);
#endif    /* HAVE_SYS_SHM_H */

            /* prototypes for our stdio wrapper functions */
void     Fclose(FILE *);
FILE    *Fdopen(int, const char *);
char    *Fgets(char *, int, FILE *);
FILE    *Fopen(const char *, const char *);
void     Fputs(const char *, FILE *);
FILE    *Popen(const char *, const char *);
int         Pclose(FILE *);

#ifdef    HAVE_FATTACH
void     Fattach(int, const char *);
#endif
#ifdef    HAVE_POLL
int         Poll(struct pollfd *, unsigned long, int);
#endif

void     err_dump(const char *, ...);
void     err_msg(const char *, ...);
void     err_quit(const char *, ...);
void     err_ret(const char *, ...);
void     err_sys(const char *, ...);

            /* prototypes for our pthread wrapper functions */
void     Pthread_attr_init(pthread_attr_t *);
void     Pthread_attr_destroy(pthread_attr_t *);
void     Pthread_attr_setdetachstate(pthread_attr_t *, int);
void     Pthread_attr_setscope(pthread_attr_t *, int);
void     Pthread_create(pthread_t *, const pthread_attr_t *,
                        void * (*)(void *), void *);
void     Pthread_join(pthread_t, void **);
void     Pthread_detach(pthread_t);
void     Pthread_kill(pthread_t, int);
void     Pthread_setcancelstate(int, int *);

void     Pthread_mutexattr_init(pthread_mutexattr_t *);
void     Pthread_mutexattr_destroy(pthread_mutexattr_t *);
void     Pthread_mutexattr_setpshared(pthread_mutexattr_t *, int);
void     Pthread_mutex_init(pthread_mutex_t *, pthread_mutexattr_t *);
void     Pthread_mutex_destroy(pthread_mutex_t *);
void     Pthread_mutex_lock(pthread_mutex_t *);
void     Pthread_mutex_unlock(pthread_mutex_t *);

void     Pthread_condattr_init(pthread_condattr_t *);
void     Pthread_condattr_destroy(pthread_condattr_t *);
void     Pthread_condattr_setpshared(pthread_condattr_t *, int);
void     Pthread_cond_broadcast(pthread_cond_t *);
void     Pthread_cond_signal(pthread_cond_t *);
void     Pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
void     Pthread_cond_timedwait(pthread_cond_t *, pthread_mutex_t *,
                                const struct timespec *);

void     Pthread_key_create(pthread_key_t *, void (*)(void *));
void     Pthread_setspecific(pthread_key_t, const void *);
void     Pthread_once(pthread_once_t *, void (*)(void));
long     pr_thread_id(pthread_t *);

#ifdef    HAVE_DOOR_H
            /* typedefs to simplify declarations */
typedef    void  Door_server_proc(void *, char *, size_t, door_desc_t *, size_t);
typedef    void  Door_create_proc(door_info_t *);

            /* prototypes for our doors wrapper functions */

void     Door_bind(int);
void     Door_call(int, door_arg_t *);
int         Door_create(Door_server_proc *, void *, u_int);
void     Door_cred(door_cred_t *);
void     Door_info(int, door_info_t *);
void     Door_return(char *, size_t, door_desc_t *, size_t);
void     Door_revoke(int);
void     Door_unbind(void);
Door_create_proc    *Door_server_create(Door_create_proc *);
#endif    /* HAVE_DOOR_H */

#ifdef    HAVE_RPC_RPC_H
CLIENT    *Clnt_create(const char *, u_long, u_long, const char *);
void     Clnt_control(CLIENT *, u_int, char *);
#endif

#endif    /* __unpipc_h */

//errors.h
#ifndef __errors_h  
#define __errors_h  
  
#include <unistd.h>  
#include <errno.h>  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#ifdef DEBUG  
#define DPRINTF(arg) printf arg  
#eles  
#define DPRINTF(arg)  
#endif  
// 用do_while语句结束，把{}里的当作语句块  
#define err_abort(code, text) do {\
  fprintf( stderr, "%s at \"%s\":%d: %s\n",       text, __FILE__, __LINE__, strerror(code));  abort();   } while (0)  
  
#define errno_abort(text) do{ \
  fprintf( stderr, "%s at \"%s\":%d: %s\n",              text, __FILE__, __LINE__, strerror(errno));   abort();   } while (0)  
  
#endif 

//config.h
/* config.h.  Generated automatically by configure.  */
/* Define the following if you have the corresponding header */
#define    CPU_VENDOR_OS "i686-pc-linux-gnu"

/* *INDENT-OFF* */
/* #undef    HAVE_DOOR_H */                /* <door.h> */
/* #undef    HAVE_MQUEUE_H */                /* <mqueue.h> */
#define    HAVE_POLL_H 1                /* <poll.h> */
#define    HAVE_PTHREAD_H 1            /* <pthread.h> */
#define    HAVE_RPC_RPC_H 1            /* <rpc/rpc.h> */
#define    HAVE_SEMAPHORE_H 1            /* <semaphore.h> */
#define    HAVE_STRINGS_H 1            /* <strings.h> */
/* #undef    HAVE_SYS_FILIO_H */            /* <sys/filio.h> */
#define    HAVE_SYS_IOCTL_H 1            /* <sys/ioctl.h> */
#define    HAVE_SYS_IPC_H 1            /* <sys/ipc.h> */
#define    HAVE_SYS_MMAN_H 1            /* <sys/mman.h> */
#define    HAVE_SYS_MSG_H 1            /* <sys/msg.h> */
#define    HAVE_SYS_SEM_H 1            /* <sys/sem.h> */
#define    HAVE_SYS_SHM_H 1            /* <sys/shm.h> */
#define    HAVE_SYS_SELECT_H 1            /* <sys/select.h> */
#define    HAVE_SYS_SYSCTL_H 1    /* <sys/sysctl.h> */
#define    HAVE_SYS_TIME_H 1            /* <sys/time.h> */

/* Define if we can include <time.h> with <sys/time.h> */
#define    TIME_WITH_SYS_TIME 1

/* Define the following if the function is provided */
#define    HAVE_BZERO 1
/* #undef    HAVE_FATTACH */
#define    HAVE_POLL 1
#define    HAVE_PSELECT 1
#define    HAVE_SIGWAIT 1
#define    HAVE_VALLOC 1
#define    HAVE_VSNPRINTF 1

/* Define the following if the function prototype is in a header */
#define    HAVE_GETHOSTNAME_PROTO 1    /* <unistd.h> */
#define    HAVE_GETRUSAGE_PROTO 1        /* <sys/resource.h> */
/* #undef    HAVE_PSELECT_PROTO */    /* <sys/select.h> */
#define    HAVE_SHM_OPEN_PROTO 1        /* <sys/mman.h> */
#define    HAVE_SNPRINTF_PROTO 1        /* <stdio.h> */
/* #undef    HAVE_THR_SETCONCURRENCY_PROTO */        /* <thread.h> */

/* Define the following if the structure is defined. */
#define    HAVE_SIGINFO_T_STRUCT 1        /* <signal.h> */
#define    HAVE_TIMESPEC_STRUCT 1        /* <time.h> */
/* #undef    HAVE_SEMUN_UNION */        /* <sys/sem.h> */

/* Devices */
#define    HAVE_DEV_ZERO 1

/* Define the following to the appropriate datatype, if necessary */
/* #undef    int8_t */                /* <sys/types.h> */
/* #undef    int16_t */                /* <sys/types.h> */
/* #undef    int32_t */                /* <sys/types.h> */
//#define    uint8_t unsigned char                /* <sys/types.h> */
//#define    uint16_t unsigned short                /* <sys/types.h> */
//#define    uint32_t unsigned int                /* <sys/types.h> */
/* #undef    size_t */                /* <sys/types.h> */
/* #undef    ssize_t */                /* <sys/types.h> */

/* #undef    POSIX_IPC_PREFIX */
#define    RPCGEN_ANSIC 1            /* defined if rpcgen groks -C option */
/* *INDENT-ON* */
//add by jcq
//typedef unsigned long ulong_t;
#define MSG_R 0400
#define MSG_W 0200
#define _GNU_SOURCE

//让c程序在后台执行的代码
void OS_Daemon()
{
    pid_t pid;

    if ((pid = fork()) < 0)
    {   
        fprintf(stderr, "fork1 failed: %d\n", errno);
        exit(-1);
    }

    if (pid)
    {   
        exit(0);
    }   

    setsid();

//    signal(SIGCLD, SIG_IGN);
    signal(SIGTERM, SIG_IGN);
    signal(SIGQUIT, SIG_IGN);
    signal(SIGINT, SIG_IGN);
    signal(SIGHUP, SIG_IGN);
    signal(SIGPIPE, SIG_IGN);

    if ((pid = fork()) < 0)
    {   
        fprintf(stderr, "fork2 failed: %d\n", errno);
        exit(-1);
    }   

    if (pid)
    {   
        exit(0);
    }   

/*
    chdir("/");
    umask(0);
*/
}