Originální popis anglicky:
perror - write error messages to standard error
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
void perror(const char *
s);
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.
The
perror() function shall not return a value.
No errors are defined.
The following sections are informative.
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);
}
...
None.
None.
None.
strerror() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<stdio.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- 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
.
