error logging in c - linux environment

Question

I have been reading about how to keep error/warning logs of a C program on Linux environment. Is it better to write the errno to a file as it is done here or is it better to use syslog or setlogmask system calls or another method? I would appreciate an answer with an example code.

Notice that syslog is not a system call (which are listed in syscalls(2) man page). — Basile Starynkevitch
– Basile Starynkevitch, Commented Apr 29, 2013 at 9:31

Pradheep · Accepted Answer · 2013-04-29 08:59:50Z

I would strongly suggest using syslog for logging errors as its more standard way of logging.

you can look at the example implemenation here (bio3d.colorado.edu/tor/sadocs/misc/syslog.html)

Also unix network programming book by richard stevens also contains good explanation of using syslog

Den-Jason · Accepted Answer · 2019-09-05 10:01:21Z

The above link no longer works - try this one here: https://www.gnu.org/software/libc/manual/html_node/Syslog-Example.html#Syslog-Example

....which contains the following example:

#include <syslog.h> setlogmask (LOG_UPTO (LOG_NOTICE)); openlog ("exampleprog", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1); syslog (LOG_NOTICE, "Program started by User %d", getuid ()); syslog (LOG_INFO, "A tree falls in a forest"); closelog ();

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