perror(3p) [centos man page]

PERROR(3P)						     POSIX Programmer's Manual							PERROR(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       perror - write error messages to standard error

SYNOPSIS

       #include <stdio.h>

       void perror(const char *s);

DESCRIPTION

       The perror() function shall map the error number accessed through the symbol errno to a language-dependent error message,  which  shall	be
       written to the standard error stream as follows:

	* First  (if  s  is  not  a null pointer and the character pointed to by s is not the null byte), the string pointed to by s followed by a
	  colon and a <space>.

	* Then an error message string followed by a <newline>.

       The contents of the error message strings shall be the same as those returned by strerror() with argument errno.

       The perror() function shall mark the file associated with the standard error stream as having been written (st_ctime, st_mtime  marked  for
       update) at some time between its successful completion and exit(), abort(), or the completion of fflush() or fclose() on stderr.

       The perror() function shall not change the orientation of the standard error stream.

RETURN VALUE

       The perror() function shall not return a value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

   Printing an Error Message for a Function
       The  following example replaces bufptr with a buffer that is the necessary size. If an error occurs, the perror() function prints a message
       and the program exits.

	      #include <stdio.h>
	      #include <stdlib.h>
	      ...
	      char *bufptr;
	      size_t szbuf;
	      ...
	      if ((bufptr = malloc(szbuf)) == NULL) {
		  perror("malloc"); exit(2);
	      }
	      ...

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

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

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								PERROR(3P)

PERROR(3P)						     POSIX Programmer's Manual							PERROR(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       perror - write error messages to standard error

SYNOPSIS

       #include <stdio.h>

       void perror(const char *s);

DESCRIPTION

       The perror() function shall map the error number accessed through the symbol errno to a language-dependent error message,  which  shall	be
       written to the standard error stream as follows:

	* First  (if  s  is  not  a null pointer and the character pointed to by s is not the null byte), the string pointed to by s followed by a
	  colon and a <space>.

	* Then an error message string followed by a <newline>.

       The contents of the error message strings shall be the same as those returned by strerror() with argument errno.

       The perror() function shall mark the file associated with the standard error stream as having been written (st_ctime, st_mtime  marked  for
       update) at some time between its successful completion and exit(), abort(), or the completion of fflush() or fclose() on stderr.

       The perror() function shall not change the orientation of the standard error stream.

RETURN VALUE

       The perror() function shall not return a value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

   Printing an Error Message for a Function
       The  following example replaces bufptr with a buffer that is the necessary size. If an error occurs, the perror() function prints a message
       and the program exits.

	      #include <stdio.h>
	      #include <stdlib.h>
	      ...
	      char *bufptr;
	      size_t szbuf;
	      ...
	      if ((bufptr = malloc(szbuf)) == NULL) {
		  perror("malloc"); exit(2);
	      }
	      ...

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

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

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								PERROR(3P)