erl_error(3erl) [linux man page]

erl_error(3erl) 						C Library Functions						   erl_error(3erl)

NAME

       erl_error - Error Print Routines

DESCRIPTION

       This module contains some error printing routines taken from Advanced Programming in the UNIX Environment by W. Richard Stevens.

       These  functions are all called in the same manner as printf() , i.e. with a string containing format specifiers followed by a list of cor-
       responding arguments. All output from these functions is to stderr .

EXPORTS

       void erl_err_msg(FormatStr, ... )

	      Types  const char *FormatStr;

	      The message provided by the caller is printed. This function is simply a wrapper for fprintf() .

       void erl_err_quit(FormatStr, ... )

	      Types  const char *FormatStr;

	      Use this function when a fatal error has occurred that is not due to a system call. The message provided by the  caller  is  printed
	      and the process terminates with an exit value of 1. The function does not return.

       void erl_err_ret(FormatStr, ... )

	      Types  const char *FormatStr;

	      Use this function after a failed system call. The message provided by the caller is printed followed by a string describing the rea-
	      son for failure.

       void erl_err_sys(FormatStr, ... )

	      Types  const char *FormatStr;

	      Use this function after a failed system call. The message provided by the caller is printed followed by a string describing the rea-
	      son for failure, and the process terminates with an exit value of 1. The function does not return.

ERROR REPORTING

       Most  functions	in erl_interface report failures to the caller by returning some otherwise meaningless value (typically NULL or a negative
       number). As this only tells you that things did not go well, you will have to examine the error code in erl_errno if you want to  find  out
       more about the failure.

EXPORTS

       volatile int erl_errno

	      erl_errno is initially (at program startup) zero and is then set by many erl_interface functions on failure to a non-zero error code
	      to indicate what kind of error it encountered. A successful function call might change erl_errno (by  calling  some  other  function
	      that  fails),  but  no function will ever set it to zero. This means that you cannot use erl_errno to see if a function call failed.
	      Instead, each function reports failure in its own way (usually by returning a negative number or NULL ), in which case you can exam-
	      ine erl_errno for details.

	      erl_errno uses the error codes defined in your system's <errno.h> .

   Note:
       Actually,  erl_errno  is  a "modifiable lvalue" (just like ISO C defines errno to be) rather than a variable. This means it might be imple-
       mented as a macro (expanding to, e.g., *_erl_errno() ). For reasons of thread- (or task-)safety, this is exactly what we do on  most  plat-
       forms.

Ericsson AB							erl_interface 3.7.3						   erl_error(3erl)

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erl_global(3erl)						C Library Functions						  erl_global(3erl)

NAME

       erl_global - Access globally registered names

DESCRIPTION

       This module provides support for registering, looking up and unregistering names in the Erlang Global module. For more information, see the
       description of Global in the reference manual.

       Note that the functions below perform an RPC using an open file descriptor provided by the caller. This file descriptor must  not  be  used
       for other traffic during the global operation or the function may receive unexpected data and fail.

EXPORTS

       char ** erl_global_names(fd,count)

	      Types  int fd;
		     int *count;

	      Retrieve a list of all known global names.

	      fd is an open descriptor to an Erlang connection.

	      count is the address of an integer, or NULL. If count is not NULL, it will be set by the function to the number of names found.

	      On  success,  the  function  returns  an array of strings, each containing a single registered name, and sets count to the number of
	      names found. The array is terminated by a single NULL pointer. On failure, the function returns NULL and count is not modified.

   Note:
       It is the caller's responsibility to free the array afterwards. It has been allocated by the function with a single call to malloc() , so a
       single free() is all that is necessary.

       int erl_global_register(fd,name,pid)

	      Types  int fd;
		     const char *name;
		     ETERM *pid;

	      This function registers a name in Global.

	      fd is an open descriptor to an Erlang connection.

	      name is the name to register in Global.

	      pid  is  the pid that should be associated with name . This is the value that Global will return when processes request the location
	      of name .

	      The function returns 0 on success, or -1 on failure.

       int erl_global_unregister(fd,name)

	      Types  int fd;
		     const char *name;

	      This function unregisters a name from Global.

	      fd is an open descriptor to an Erlang connection.

	      name is the name to unregister from Global.

	      The function returns 0 on success, or -1 on failure.

       ETERM * erl_global_whereis(fd,name,node)

	      Types  int fd;
		     const char *name;
		     char *node;

	      fd is an open descriptor to an Erlang connection.

	      name is the name that is to be looked up in Global.

	      If node is not NULL, it is a pointer to a buffer where the function can fill in the name of the node where name is found.  node  can
	      be passed directly to erl_connect() if necessary.

	      On  success,  the function returns an Erlang Pid containing the address of the given name, and node will be initialized to the node-
	      name where name is found. On failure NULL will be returned and node will not be modified.

Ericsson AB							erl_interface 3.7.3						  erl_global(3erl)

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erl_error(3erl) [linux man page]

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