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    Command:

    sys_nerr

    
    
    

    SYNOPSIS

           #include <stdio.h>
    
           void perror(const char *s);
    
           #include <errno.h>
    
           const char *sys_errlist[];
           int sys_nerr;
           int errno;
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           sys_errlist, sys_nerr: _BSD_SOURCE
    
    
    

    DESCRIPTION

           The  routine  perror() produces a message on the standard error output,
           describing the last error encountered during a  call  to  a  system  or
           library  function.   First  (if s is not NULL and *s is not a null byte
           ('\0')) the argument string s is printed, followed by  a  colon  and  a
           blank.  Then the message and a new-line.
    
           To  be  of most use, the argument string should include the name of the
           function that incurred the error.  The error number is taken  from  the
           external variable errno, which is set when errors occur but not cleared
           when successful calls are made.
    
           The global error list sys_errlist[] indexed by errno  can  be  used  to
           obtain the error message without the newline.  The largest message num-
           ber provided in the table is  sys_nerr-1.   Be  careful  when  directly
           accessing this list because new error values may not have been added to
           sys_errlist[].  The use of sys_errlist[] is nowadays deprecated.
    
           When a system call fails, it usually returns -1 and sets  the  variable
           errno  to  a  value  describing  what went wrong.  (These values can be
           found in <errno.h>.)  Many library functions do likewise.  The function
           perror()  serves to translate this error code into human-readable form.
           Note that errno is undefined after a successful library call: this call
           may  well  change  this  variable, even though it succeeds, for example
           because it internally used some other  library  function  that  failed.
           Thus,  if  a failing call is not immediately followed by a call to per-
           ror(), the value of errno should be saved.
    
    
    

    CONFORMING TO

           The function perror() and the external errno (see errno(3)) conform  to
           C89, C99, 4.3BSD, POSIX.1-2001.  The externals sys_nerr and sys_errlist
           conform to BSD.
    
    
    

    NOTES

           The externals sys_nerr and sys_errlist are defined  by  glibc,  but  in
           <stdio.h>.
    
    
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