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           #include <string.h>
           char *strerror(int errnum);
           int strerror_r(int errnum, char *buf, size_t buflen);
                       /* XSI-compliant */
           char *strerror_r(int errnum, char *buf, size_t buflen);
                       /* GNU-specific */
           char *strerror_l(int errnum, locale_t locale);
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
               The XSI-compliant version is provided if:
               (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) &&
               ! _GNU_SOURCE
               Otherwise, the GNU-specific version is provided.


           The  strerror()  function  returns a pointer to a string that describes
           the error code passed  in  the  argument  errnum,  possibly  using  the
           LC_MESSAGES  part  of the current locale to select the appropriate lan-
           guage.  (For example, if errnum is  EINVAL,  the  returned  description
           will  be  "Invalid argument".)  This string must not be modified by the
           application, but may be modified by a subsequent call to strerror()  or
           strerror_l().   No  other  library  function, including perror(3), will
           modify this string.
           The strerror_r() function is similar to strerror(), but is thread safe.
           This  function  is  available in two versions: an XSI-compliant version
           specified in POSIX.1-2001 (available since glibc 2.3.4, but not  POSIX-
           compliant  until  glibc  2.13),  and  a GNU-specific version (available
           since glibc 2.0).  The XSI-compliant version is provided with the  fea-
           ture test macros settings shown in the SYNOPSIS; otherwise the GNU-spe-
           cific version is provided.  If no feature test  macros  are  explicitly
           defined,  then  (since  glibc  2.4) _POSIX_SOURCE is defined by default
           with the value 200112L, so  that  the  XSI-compliant  version  of  str-
           error_r() is provided by default.
           The  XSI-compliant strerror_r() is preferred for portable applications.
           It returns the error string in the user-supplied buffer buf  of  length
           The  GNU-specific strerror_r() returns a pointer to a string containing
           the error message.  This may be either a pointer to a string  that  the
           function  stores in buf, or a pointer to some (immutable) static string
           (in which case buf is unused).  If the function stores a string in buf,
           The XSI-compliant strerror_r()  function  returns  0  on  success.   On
           error,  a (positive) error number is returned (since glibc 2.13), or -1
           is returned and errno is set to  indicate  the  error  (glibc  versions
           before 2.13).
           POSIX.1-2001  and  POSIX.1-2008  require that a successful call to str-
           error() or strerror_l() shall leave errno  unchanged,  and  note  that,
           since  no  function  return  value is reserved to indicate an error, an
           application that wishes to check for errors should initialize errno  to
           zero before the call, and then check errno after the call.


           EINVAL The value of errnum is not a valid error number.
           ERANGE Insufficient  storage was supplied to contain the error descrip-
                  tion string.


       Multithreading (see pthreads(7))
           The strerror() function is not thread-safe.
           The strerror_r() function is thread-safe.


           The strerror_l() function first appeared in glibc 2.6.


           strerror() is specified by POSIX.1-2001, POSIX.1-2008,  C89,  and  C99.
           strerror_r() is specified by POSIX.1-2001 and POSIX.1-2008.
           strerror_l() is specified in POSIX.1-2008.
           The GNU-specific strerror_r() function is a nonstandard extension.
           POSIX.1-2001  permits strerror() to set errno if the call encounters an
           error, but does not specify what value should be returned as the  func-
           tion  result  in  the  event  of an error.  On some systems, strerror()
           returns NULL if the error number is unknown.  On  other  systems,  str-
           error()  returns  a string something like "Error nnn occurred" and sets
           errno to EINVAL if the error number is unknown.  C99  and  POSIX.1-2008
           require the return value to be non-NULL.


           err(3), errno(3), error(3), perror(3), strsignal(3), locale(7)
                                      2014-03-18                       STRERROR(3)

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