perror(2) plan9 man page | unix.com

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 describing 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 arguments; 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)