strerror man page on Archlinux

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STRERROR(3)		   Linux Programmer's Manual		   STRERROR(3)

       strerror,  strerror_r, strerror_l - return string describing error num‐

       #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) &&
	   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,
       then  at	 most  buflen bytes are stored (the string may be truncated if
       buflen is too small and errnum is unknown).  The string always includes
       a terminating null byte ('\0').

       strerror_l()  is like strerror(), but maps errnum to a locale-dependent
       error message in the locale specified by locale.	 The behavior of  str‐
       error_l()   is  undefined  if  locale  is  the  special	locale	object
       LC_GLOBAL_LOCALE or is not a valid locale object handle.

       The strerror(), strerror_l(), and the GNU-specific  strerror_r()	 func‐
       tions  return  the appropriate error description string, or an "Unknown
       error nnn" message if the error number is unknown.

       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)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

				  2014-03-18			   STRERROR(3)

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