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+/* The <errno.h> header defines the numbers of the various errors that can
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+ * occur during program execution. They are visible to user programs and
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+ * should be small positive integers. However, they are also used within
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+ * MINIX, where they must be negative. For example, the READ system call is
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+ * executed internally by calling do_read(). This function returns either a
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+ * (negative) error number or a (positive) number of bytes actually read.
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+ *
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+ * To solve the problem of having the error numbers be negative inside the
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+ * the system and positive outside, the following mechanism is used. All the
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+ * definitions are are the form:
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+ *
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+ * #define EPERM (_SIGN 1)
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+ *
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+ * If the macro _SYSTEM is defined, then _SIGN is set to "-", otherwise it is
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+ * set to "". Thus when compiling the operating system, the macro _SYSTEM
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+ * will be defined, setting EPERM to (- 1), whereas when when this
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+ * file is included in an ordinary user program, EPERM has the value ( 1).
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+ */
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+
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+#ifndef _ERRNO_H /* check if <errno.h> is already included */
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+#define _ERRNO_H /* it is not included; note that fact */
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+
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+/* Now define _SIGN as "" or "-" depending on _SYSTEM. */
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+#ifdef _SYSTEM
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+# define _SIGN -
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+# define OK 0
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+#else
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+# define _SIGN
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+#endif
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+
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+extern int errno; /* place where the error numbers go */
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+
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+/* Here are the numerical values of the error numbers. */
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+#define _NERROR 39 /* number of errors */
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+
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+#define ERROR (_SIGN 99) /* generic error */
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+#define EPERM (_SIGN 1) /* operation not permitted */
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+#define ENOENT (_SIGN 2) /* no such file or directory */
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+#define ESRCH (_SIGN 3) /* no such process */
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+#define EINTR (_SIGN 4) /* interrupted function call */
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+#define EIO (_SIGN 5) /* input/output error */
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+#define ENXIO (_SIGN 6) /* no such device or address */
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+#define E2BIG (_SIGN 7) /* arg list too long */
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+#define ENOEXEC (_SIGN 8) /* exec format error */
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+#define EBADF (_SIGN 9) /* bad file descriptor */
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+#define ECHILD (_SIGN 10) /* no child process */
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+#define EAGAIN (_SIGN 11) /* resource temporarily unavailable */
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+#define ENOMEM (_SIGN 12) /* not enough space */
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+#define EACCES (_SIGN 13) /* permission denied */
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+#define EFAULT (_SIGN 14) /* bad address */
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+#define ENOTBLK (_SIGN 15) /* Extension: not a block special file */
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+#define EBUSY (_SIGN 16) /* resource busy */
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+#define EEXIST (_SIGN 17) /* file exists */
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+#define EXDEV (_SIGN 18) /* improper link */
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+#define ENODEV (_SIGN 19) /* no such device */
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+#define ENOTDIR (_SIGN 20) /* not a directory */
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+#define EISDIR (_SIGN 21) /* is a directory */
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+#define EINVAL (_SIGN 22) /* invalid argument */
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+#define ENFILE (_SIGN 23) /* too many open files in system */
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+#define EMFILE (_SIGN 24) /* too many open files */
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+#define ENOTTY (_SIGN 25) /* inappropriate I/O control operation */
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+#define ETXTBSY (_SIGN 26) /* no longer used */
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+#define EFBIG (_SIGN 27) /* file too large */
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+#define ENOSPC (_SIGN 28) /* no space left on device */
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+#define ESPIPE (_SIGN 29) /* invalid seek */
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+#define EROFS (_SIGN 30) /* read-only file system */
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+#define EMLINK (_SIGN 31) /* too many links */
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+#define EPIPE (_SIGN 32) /* broken pipe */
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+#define EDOM (_SIGN 33) /* domain error (from ANSI C std) */
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+#define ERANGE (_SIGN 34) /* result too large (from ANSI C std) */
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+#define EDEADLK (_SIGN 35) /* resource deadlock avoided */
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+#define ENAMETOOLONG (_SIGN 36) /* file name too long */
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+#define ENOLCK (_SIGN 37) /* no locks available */
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+#define ENOSYS (_SIGN 38) /* function not implemented */
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+#define ENOTEMPTY (_SIGN 39) /* directory not empty */
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+
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+/* The following are not POSIX errors, but they can still happen. */
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+#define ELOCKED (_SIGN 101) /* can't send message */
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+#define EBADCALL (_SIGN 102) /* error on send/receive */
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+
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+/* The following error codes are generated by the kernel itself. */
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+#ifdef _SYSTEM
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+#define E_BAD_DEST -1 /* destination address illegal */
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+#define E_BAD_SRC -2 /* source address illegal */
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+#define E_TRY_AGAIN -3 /* can't send-- tables full */
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+#define E_OVERRUN -4 /* interrupt for task that is not waiting */
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+#define E_BAD_BUF -5 /* message buf outside caller's addr space */
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+#define E_TASK -6 /* can't send to task */
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+#define E_NO_MESSAGE -7 /* RECEIVE failed: no message present */
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+#define E_NO_PERM -8 /* ordinary users can't send to tasks */
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+#define E_BAD_FCN -9 /* only valid fcns are SEND, RECEIVE, BOTH */
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+#define E_BAD_ADDR -10 /* bad address given to utility routine */
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+#define E_BAD_PROC -11 /* bad proc number given to utility */
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+#endif /* _SYSTEM */
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+
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+#endif /* _ERRNO_H */
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