perror(3C)
NAME
perror, errno - print system error messages
SYNOPSIS
#include <stdio.h>
void perror(const char *s);
#include <errno.h>
int errno;
DESCRIPTION
The perror() function produces a message on the standard
error output (file descriptor 2) describing the last error
encountered during a call to a system or library function.
The argument string s is printed, followed by a colon and a
blank, followed by the message and a NEWLINE character. If
s is a null pointer or points to a null string, the colon is
not printed. The argument string should include the name of
the program that incurred the error. The error number is
taken from the external variable errno, which is set when
errors occur but not cleared when non-erroneous calls are
made. See intro(2).
USAGE
If the application is linked with -lintl, then messages
printed from this function are in the native language speci-
fied by the LC_MESSAGES locale category. See setlocale(3C).
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT-Level | MT-Safe |
|_____________________________|_____________________________|
SEE ALSO
intro(2), fmtmsg(3C), gettext(3C), setlocale(3C),
strerror(3C), attributes(5)
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