term% cat index.txt PERROR(2) System Calls Manual PERROR(2)
NAME
perror, syslog - system error messages
SYNOPSIS
#include <u.h>
#include <libc.h>
void perror(char *s)
void syslog(int cons, char *logname, char *fmt, ...)
DESCRIPTION
Perror produces a short error message on the standard error file de‐
scribing the last error encountered during a call to the system. First
the argument string s is printed, then a colon, then the message and a
newline. If s is 0, only the error message and newline are printed.
Syslog logs messages in the file named by logname in the directory
/sys/log; the file must already exist and should be append-only. Log‐
name must contain no slashes. The message is a line with several
fields: the name of the machine writing the message; the date and time;
the message specified by the print(2) format fmt and any following ar‐
guments; and a final newline. If cons is set or the log file cannot be
opened, the message is also printed on the system console. Syslog can
be used safely in multi-threaded programs.
SOURCE
/sys/src/libc/port/perror.c
/sys/src/libc/9sys/syslog.c
SEE ALSO
intro(2), errstr(2), the %r format in print(2)
BUGS
Perror is a holdover; the %r format in print(2) is preferred.
PERROR(2)