FreeBSD/Linux Kernel Cross Reference
sys/include/errno.h

     /* The <errno.h> header defines the numbers of the various errors that can
      * occur during program execution.  They are visible to user programs and 
      * should be small positive integers.  However, they are also used within 
      * MINIX, where they must be negative.  For example, the READ system call is 
      * executed internally by calling do_read().  This function returns either a 
      * (negative) error number or a (positive) number of bytes actually read.
      *
      * To solve the problem of having the error numbers be negative inside the
      * the system and positive outside, the following mechanism is used.  All the
     * definitions are are the form:
     *
     *      #define EPERM           (_SIGN 1)
     *
     * If the macro _SYSTEM is defined, then  _SIGN is set to "-", otherwise it is
     * set to "".  Thus when compiling the operating system, the  macro _SYSTEM
     * will be defined, setting EPERM to (- 1), whereas when when this
     * file is included in an ordinary user program, EPERM has the value ( 1).
     */
    
    #ifndef _ERRNO_H                /* check if <errno.h> is already included */
    #define _ERRNO_H                /* it is not included; note that fact */
    
    /* Now define _SIGN as "" or "-" depending on _SYSTEM. */
    #ifdef _SYSTEM
    #   define _SIGN         -
    #   define OK            0
    #else
    #   define _SIGN         
    #endif
    
    extern int errno;                 /* place where the error numbers go */
    
    /* Here are the numerical values of the error numbers. */
    #define _NERROR               70  /* number of errors */  
    
    #define EGENERIC      (_SIGN 99)  /* generic error */
    #define EPERM         (_SIGN  1)  /* operation not permitted */
    #define ENOENT        (_SIGN  2)  /* no such file or directory */
    #define ESRCH         (_SIGN  3)  /* no such process */
    #define EINTR         (_SIGN  4)  /* interrupted function call */
    #define EIO           (_SIGN  5)  /* input/output error */
    #define ENXIO         (_SIGN  6)  /* no such device or address */
    #define E2BIG         (_SIGN  7)  /* arg list too long */
    #define ENOEXEC       (_SIGN  8)  /* exec format error */
    #define EBADF         (_SIGN  9)  /* bad file descriptor */
    #define ECHILD        (_SIGN 10)  /* no child process */
    #define EAGAIN        (_SIGN 11)  /* resource temporarily unavailable */
    #define ENOMEM        (_SIGN 12)  /* not enough space */
    #define EACCES        (_SIGN 13)  /* permission denied */
    #define EFAULT        (_SIGN 14)  /* bad address */
    #define ENOTBLK       (_SIGN 15)  /* Extension: not a block special file */
    #define EBUSY         (_SIGN 16)  /* resource busy */
    #define EEXIST        (_SIGN 17)  /* file exists */
    #define EXDEV         (_SIGN 18)  /* improper link */
    #define ENODEV        (_SIGN 19)  /* no such device */
    #define ENOTDIR       (_SIGN 20)  /* not a directory */
    #define EISDIR        (_SIGN 21)  /* is a directory */
    #define EINVAL        (_SIGN 22)  /* invalid argument */
    #define ENFILE        (_SIGN 23)  /* too many open files in system */
    #define EMFILE        (_SIGN 24)  /* too many open files */
    #define ENOTTY        (_SIGN 25)  /* inappropriate I/O control operation */
    #define ETXTBSY       (_SIGN 26)  /* no longer used */
    #define EFBIG         (_SIGN 27)  /* file too large */
    #define ENOSPC        (_SIGN 28)  /* no space left on device */
    #define ESPIPE        (_SIGN 29)  /* invalid seek */
    #define EROFS         (_SIGN 30)  /* read-only file system */
    #define EMLINK        (_SIGN 31)  /* too many links */
    #define EPIPE         (_SIGN 32)  /* broken pipe */
    #define EDOM          (_SIGN 33)  /* domain error       (from ANSI C std) */
    #define ERANGE        (_SIGN 34)  /* result too large   (from ANSI C std) */
    #define EDEADLK       (_SIGN 35)  /* resource deadlock avoided */
    #define ENAMETOOLONG  (_SIGN 36)  /* file name too long */
    #define ENOLCK        (_SIGN 37)  /* no locks available */
    #define ENOSYS        (_SIGN 38)  /* function not implemented */
    #define ENOTEMPTY     (_SIGN 39)  /* directory not empty */
    
    /* The following errors relate to networking. */
    #define EPACKSIZE     (_SIGN 50)  /* invalid packet size for some protocol */
    #define EOUTOFBUFS    (_SIGN 51)  /* not enough buffers left */
    #define EBADIOCTL     (_SIGN 52)  /* illegal ioctl for device */
    #define EBADMODE      (_SIGN 53)  /* badmode in ioctl */
    #define EWOULDBLOCK   (_SIGN 54)
    #define EBADDEST      (_SIGN 55)  /* not a valid destination address */
    #define EDSTNOTRCH    (_SIGN 56)  /* destination not reachable */
    #define EISCONN       (_SIGN 57)  /* all ready connected */
    #define EADDRINUSE    (_SIGN 58)  /* address in use */
    #define ECONNREFUSED  (_SIGN 59)  /* connection refused */
    #define ECONNRESET    (_SIGN 60)  /* connection reset */
    #define ETIMEDOUT     (_SIGN 61)  /* connection timed out */
    #define EURG          (_SIGN 62)  /* urgent data present */
    #define ENOURG        (_SIGN 63)  /* no urgent data present */
    #define ENOTCONN      (_SIGN 64)  /* no connection (yet or anymore) */
    #define ESHUTDOWN     (_SIGN 65)  /* a write call to a shutdown connection */
    #define ENOCONN       (_SIGN 66)  /* no such connection */
    #define EAFNOSUPPORT  (_SIGN 67)  /* address family not supported */
    #define EPROTONOSUPPORT (_SIGN 68) /* protocol not supported by AF */
    #define EPROTOTYPE    (_SIGN 69)  /* Protocol wrong type for socket */
    #define EINPROGRESS   (_SIGN 70)  /* Operation now in progress */
    #define EADDRNOTAVAIL (_SIGN 71)  /* Can't assign requested address */
   #define EALREADY      (_SIGN 72)  /* Connection already in progress */
   #define EMSGSIZE      (_SIGN 73)  /* Message too long */
   #define ELOOP         (_SIGN 74)  /* Too many levels of symbolic links */
   
   /* The following are not POSIX errors, but they can still happen. 
    * All of these are generated by the kernel and relate to message passing.
    */
   #define ELOCKED      (_SIGN 101)  /* can't send message due to deadlock */
   #define EBADCALL     (_SIGN 102)  /* illegal system call number */
   #define EBADSRCDST   (_SIGN 103)  /* bad source or destination process */
   #define ECALLDENIED  (_SIGN 104)  /* no permission for system call */
   #define EDEADSRCDST  (_SIGN 105)  /* source or destination is not alive */
   #define ENOTREADY    (_SIGN 106)  /* source or destination is not ready */
   #define EBADREQUEST  (_SIGN 107)  /* destination cannot handle request */
   #define ESRCDIED     (_SIGN 108)  /* source just died */
   #define EDSTDIED     (_SIGN 109)  /* destination just died */
   #define ETRAPDENIED  (_SIGN 110)  /* IPC trap not allowed */
   #define EDONTREPLY   (_SIGN 201)  /* pseudo-code: don't send a reply */
   
   #endif /* _ERRNO_H */

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