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fuse_log_level is guaranteed to be the same as libc as syslog is
a network protocol and levels are numerical constants enforced in
RFCs. Syslog is originally BSD-only and was imported by glibc and
standardised in SUS and POSIX.
Use vsyslog rather than formatting a new intermediate string.
Signed-off-by: Vassili Tchersky <vt+git@vbc.su>
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I see random ENOTCONN failures in xfstest generic/013 and generic/014
in my branch, but earliest on the 2nd run - takes ~12hours to get
the issue, but then there are no further information logged.
ENOTCONN points to a daemon crash - I need backtraces and a core dump.
This adds optional handling of fatal signals to print a core dump
and optional syslog logging with these new public functions:
fuse_set_fail_signal_handlers()
In addition to the existing fuse_set_signal_handlers(). This is not
enabled together with fuse_set_signal_handlers(), as it is change
in behavior and file systems might already have their own fatal
handlers.
fuse_log_enable_syslog
Print logs to syslog instead of stderr
fuse_log_close_syslog
Close syslog (for now just does closelog())
Code in fuse_signals.c is also updated, to be an array of signals,
and setting signal handlers is now down with a for-loop instead
of one hand coded set_one_signal_handler() per signal.
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Applications may wish to call fuse_log() for unified logging. This way
they don't need to define their own wrappers to invoke the log message
handler function installed by fuse_set_log_func().
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Introduce an API for custom log handler functions. This allows libfuse
applications to send messages to syslog(3) or other logging systems.
See include/fuse_log.h for details.
Convert libfuse from fprintf(stderr, ...) to log_fuse(level, ...). Most
messages are error messages with FUSE_LOG_ERR log level. There are also
some debug messages which now use the FUSE_LOG_DEBUG log level.
Note that lib/mount_util.c is used by both libfuse and fusermount3.
Since fusermount3 does not link against libfuse, we cannot call
fuse_log() from lib/mount_util.c. This file will continue to use
fprintf(stderr, ...) until someone figures out how to split it up.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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