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NetBSD 6.1.5 - man page for strerror_r (netbsd section 3)

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STRERROR(3)			   BSD Library Functions Manual 		      STRERROR(3)

NAME
     perror, strerror, strerror_r, sys_errlist, sys_nerr -- system error messages

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdio.h>

     void
     perror(const char *string);

     #include <errno.h>

     extern const char * const sys_errlist[];
     extern const int sys_nerr;

     #include <string.h>

     char *
     strerror(int errnum);

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

DESCRIPTION
     The strerror(), strerror_r(), and perror() functions look up the language-dependent error
     message string corresponding to an error number.

     The strerror() function accepts an error number argument errnum and returns a pointer to the
     corresponding message string.

     The strerror_r() function renders the same result into strerrbuf for a maximum of buflen
     characters and returns 0 upon success.

     The perror() function finds the error message corresponding to the current value of the
     global variable errno (intro(2)) and writes it, followed by a newline, to the standard error
     file descriptor.  If the argument string is non-NULL and does not point to the nul charac-
     ter, this string is prepended to the message string and separated from it by a colon and
     space (``: ''); otherwise, only the error message string is printed.  Note that in most
     cases the err(3) and warn(3) family of functions is preferable to perror(); they are more
     flexible and also print the program name.

     If the error number is not recognized, these functions pass an error message string contain-
     ing ``Unknown error: '' followed by the error number in decimal.  To warn about this,
     strerror() sets errno to EINVAL, and strerror_r() returns EINVAL.	Error numbers recognized
     by this implementation fall in the range 0 < errnum < sys_nerr.

     If insufficient storage is provided in strerrbuf (as specified in buflen) to contain the
     error string, strerror_r() returns ERANGE and strerrbuf will contain an error message that
     has been truncated and NUL terminated to fit the length specified by buflen.

     The message strings can be accessed directly using the external array sys_errlist.  The
     external value sys_nerr contains a count of the messages in sys_errlist.  The use of these
     variables is deprecated; strerror() or strerror_r() should be used instead.

SEE ALSO
     intro(2), err(3), psignal(3), warn(3)

STANDARDS
     The perror() and strerror() functions conform to ISO/IEC 9899:1999 (``ISO C99'').	The
     strerror_r() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The strerror() and perror() functions first appeared in 4.4BSD.  The strerror_r() function
     first appeared in NetBSD 4.0.

BUGS
     For unknown error numbers, the strerror() function will return its result in a static buffer
     which may be overwritten by subsequent calls.

     The return type for strerror() is missing a type-qualifier; it should actually be const char
     *.

     Programs that use the deprecated sys_errlist variable often fail to compile because they
     declare it inconsistently.

BSD					 October 24, 2010				      BSD
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