INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

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EDID (9) NetBSD Kernel Developer’s Manual EDID (9)SEE ALSOddc(9), edid(9), iic(9)HISTORYThese routines were added in NetBSD 4.0.AUTHORSGarrett D’Amore 〈gdamore@NetBSD.org〉NetBSD 3.0 May 11, 2006 2
ERRNO (9) NetBSD Kernel Developer’s Manual ERRNO (9)NAMEerrno —kernel internal error numbersSYNOPSIS#include DESCRIPTIONThis section provides an overview ofthe error numbers used internally by the kernel and indicate neither successnor failure. These error numbers are not returned to userland code.DIAGNOSTICSKernel functions that indicate success or failure by means of either 0 or an errno(2) value sometimes haveaneed to indicate that “special” handling is required at an upper layer or, inthe case of ioctl(2) processing,that “nothing was wrong but the request was not handled”. To handle these cases, some negativeerrno(2) values are defined which are handled by the kernel before returning a different errno(2) value touserland or simply zero.The following is a list of the defined names and their meanings as given in 〈errno.h〉. Itisimportant tonote that the value −1 is not used, since it is commonly used to indicate generic failure and leaves ituptothecaller to determine the action to take.−2 EJUSTRETURN Modify regs, just return. Nomore work is required and the function should just return.−3 ERESTART Restart syscall. The system call should be restarted. This typically means that themachine dependent system call trap code will reposition the process’s instruction pointer or programcounter to re-execute the current system call with no other work required.−4 EPASSTHROUGH Operation not handled by this layer. The operation was not handled and should bepassed through to another layer. This often occurs when processing ioctl(2) requests since lowerlayer processing may not handle something that subsequent code at a higher level will.−5 EDUPFD Duplicate file descriptor. This error is returned from the device open routine indicating thatthe l_dupfd field contains the file descriptor information to be returned to the caller, instead of thefile descriptor that has been opened already. This error is used by cloning device multiplexors.Cloning device multiplexors open a new file descriptor and associate that file descriptor with theappropriate cloned device. They set l_dupfd to that new file descriptor and return EDUPFD.vn_open(9) takes the file descriptor pointed to by l_dupfd and copies it to the file descriptor thatthe open call will return.−6 EMOVEFD Move file descriptor. This error is similar to EDUPFD except that the file descriptor inl_dupfd is closed after it has been copied.SEE ALSOerrno(2), ioctl(9)HISTORYAn errno manual page appeared in Version 6 AT&T UNIX.NetBSD 3.0.This errno manual page appeared inNetBSD 3.0 December 3, 2004 1
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