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Linux 2.6 - man page for strerror_r (linux section 3posix)

STRERROR(P)			    POSIX Programmer's Manual			      STRERROR(P)

       strerror, strerror_r - get error message string

       #include <string.h>

       char *strerror(int errnum);

       int strerror_r(int errnum, char *strerrbuf, size_t buflen);

       For  strerror():    The functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the requirements described here and the  ISO C  stan-
       dard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

       The  strerror()	function shall map the error number in errnum to a locale-dependent error
       message string and shall return a pointer to it. Typically, the	values	for  errnum  come
       from errno, but strerror() shall map any value of type int to a message.

       The  string pointed to shall not be modified by the application, but may be overwritten by
       a subsequent call to strerror()	or perror().

       The contents of the error message strings returned by strerror() should be  determined  by
       the setting of the LC_MESSAGES category in the current locale.

       The   implementation   shall   behave  as  if  no  function  defined  in  this  volume  of
       IEEE Std 1003.1-2001 calls strerror().

       The strerror() function shall not change the setting of errno if successful.

       Since no return value is reserved to indicate an error, an application  wishing	to  check
       for error situations should set errno to 0, then call strerror(), then check errno.

       The strerror() function need not be reentrant. A function that is not required to be reen-
       trant is not required to be thread-safe.

       The strerror_r() function shall map the error number in errnum to a locale-dependent error
       message	string	and  shall  return the string in the buffer pointed to by strerrbuf, with
       length buflen.

       Upon successful completion, strerror() shall return a pointer  to  the  generated  message
       string. On error errno may be set, but no return value is reserved to indicate an error.

       Upon  successful completion, strerror_r() shall return 0. Otherwise, an error number shall
       be returned to indicate the error.

       These functions may fail if:

       EINVAL The value of errnum is not a valid error number.

       The strerror_r() function may fail if:

       ERANGE Insufficient storage was supplied via strerrbuf and buflen to contain the generated
	      message string.

       The following sections are informative.





       perror() , the Base Definitions volume of IEEE Std 1003.1-2001, <string.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				      STRERROR(P)

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