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ungetc(3s) -- push character back into input stream
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ungetc inserts the character c into the buffer associated with an input stream. Pushed-back characters will be returned by subsequent reads on that stream in the reverse order of their pushing. A successful intervening call (with the stream pointed to by stream) to a file positioning function (fseek(3S), fsetpos(3S) or rewind(3S)), discards any pushed-back characters. The external storage corresponding to the stream is unchanged. A successful call to ungetc clears the end-of-file indicator for t... |
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ungetwc(3s) -- push wchar_t character back into input stream
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ungetwc inserts the wchar_t character c into the buffer associated with the input stream. That character, c, will be returned by the next getwc call on that stream. ungetwc returns c. One character of pushback is guaranteed, provided something has already been read from the stream and the stream is actually buffered. If c equals (wchar_t)EOF, ungetwc does nothing to th... |
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f90/unit(3) -- Returns the status of a BUFFER IN or BUFFER OUT statement
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UNICOS, UNICOS/mk, and IRIX systems |
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perl5/UNIVERSAL(3) -- base class for ALL classes (blessed references)
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UNIVERSAL is the base class which all bless references will inherit from, see the perlobj manpage UNIVERSAL provides the following methods isa ( TYPE ) isa returns true if REF is blessed into package TYPE or inherits from package TYPE. isa can be called as either a static or object method call. can ( METHOD ) can checks if the object has a method called METHOD. If it does then a reference to the sub is returned. If it does not then undef is returned. can can be called as either a static or objec... |
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Tcl/unknown(3) -- Handle attempts to use non-existent commands
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This command doesn't actually exist as part of Tcl, but Tcl will invoke it if it does exist. If the Tcl interpreter encounters a command name for which there is not a defined command, then Tcl checks for the existence of a command named unknown. If there is no such command, then the interpreter returns an error. If the unknown command exists, then it is invoked with arguments consisting of the fully-substituted name and arguments for the original non-existent command. The unknown command typica... |
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unlockpt(3c) -- unlock a pseudo-terminal master/slave pair
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The function unlockpt() clears a lock flag associated with the slave pseudo-terminal device associated with its master pseudo-terminal counterpart so that the slave pseudo-terminal device can be opened. fildes is a file descriptor returned from a successful open of a master pseudo-terminal device. |
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f90/unpack(3) -- Unpacks an array of rank one into an array under control of a mask
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UNICOS, UNICOS/mk, and IRIX systems |
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standard/unqdevice(3) -- disables the specified device from making entries in the event queue
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dev expects a device identifier |
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unregisterhost(3c) -- remove the existing host entry in NIS hosts database
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Unregisterhost sends an host name unregister request to registrar(1M) on NIS master via the yp_update(3R) call. After successfully completed, the host name will no longer be in the NIS hosts database and its Internet address is freed. This routine should be used only when NIS is enabled in the network. The arguments for the routine are: name The host name of the entry to be deleted. passwd The root password of NIS master. If the NIS master does not have root password, simply pass a NULL. Unregis... |
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Tcl/unset(3) -- Delete variables
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This command removes one or more variables. Each name is a variable name, specified in any of the ways acceptable to the set command. If a name refers to an element of an array then that element is removed without affecting the rest of the array. If a name consists of an array name with no parenthesized index, then the entire array is deleted. The unset command returns an empty string as result. An error occurs if any of the variables doesn't exist, and any variables after the non-existent one ... |
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Tk/update(3) -- Process pending events and/or when-idle handlers
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This command is used to bring the entire application world ``up to date.'' It flushes all pending output to the display, waits for the server to process that output and return errors or events, handles all pending events of any sort (including when-idle handlers), and repeats this set of operations until there are no pending events, no pending when-idle handlers, no pending output to the server, and no operations still outstanding at the server. If the idletasks keyword is specified as an argu... |
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Tcl/uplevel(3) -- Execute a script in a different stack frame
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All of the arg arguments are concatenated as if they had been passed to concat; the result is then evaluated in the variable context indicated by level. Uplevel returns the result of that evaluation. If level is an integer then it gives a distance (up the procedure calling stack) to move before executing the command. If level consists of # followed by a number then the number gives an absolute level number. If level is omitted then it defaults to 1. Level cannot be defaulted if the first command... |
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Tcl/upvar(3) -- Create link to variable in a different stack frame
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This command arranges for one or more local variables in the current procedure to refer to variables in an enclosing procedure call or to global variables. Level may have any of the forms permitted for the uplevel command, and may be omitted if the first letter of the first otherVar isn't # or a digit (it defaults to 1). For each otherVar argument, upvar makes the variable by that name in the procedure frame given by level (or at global level, if level is #0) accessible in the current procedure... |
