Am 06.10.2004 um 16:48 schrieb Dan Nelson:
The only unsafe part is openlog(), so set that up before you start any threads and you'll be okay. Once the log fd is opened, the syslog() call looks to be thread-safe. Everything in there is done with local variables and atomic writes.
At least on OpenBSD I can use "%m" in the syslog() format string. This results in a call to strerror(), which is not thread safe, AFAIK. This probably is true for FreeBSD as well, so we have the following three conditions for thread safe syslog():
1) openlog() must be called before any threads that use syslog() are started.
2) The first argument to openlog() must not be NULL.
3) The "%m" Format String must not be used in syslog() calls.
Any comments?
- Marc
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