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log: Drop newlines in the middle of the perror()-like messages

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Calling vlogmsg() twice from logmsg_perror() results in this beauty:

  $ ./pasta -i foo
  Invalid interface name foo
  : No such device

because the first part of the message, corresponding to the first
call, doesn't end with a newline, and vlogmsg() adds it.

Given that we can't easily append an argument (error description) to
a variadic list, add a 'newline' parameter to all the functions that
currently add a newline if missing, and disable that on the first call
to vlogmsg() from logmsg_perror(). Not very pretty but I can't think
of any solution that's less messy than this.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2024-07-24 16:36:17 +02:00
parent 13295583f8
commit 1cd773081f
3 changed files with 32 additions and 22 deletions

18
log.h
View file

@ -13,16 +13,16 @@
#define LOGFILE_CUT_RATIO 30 /* When full, cut ~30% size */
#define LOGFILE_SIZE_MIN (5UL * MAX(BUFSIZ, PAGE_SIZE))
void vlogmsg(int pri, const char *format, va_list ap);
void logmsg(int pri, const char *format, ...)
__attribute__((format(printf, 2, 3)));
void vlogmsg(bool newline, int pri, const char *format, va_list ap);
void logmsg(bool newline, int pri, const char *format, ...)
__attribute__((format(printf, 3, 4)));
void logmsg_perror(int pri, const char *format, ...)
__attribute__((format(printf, 2, 3)));
#define err(...) logmsg( LOG_ERR, __VA_ARGS__)
#define warn(...) logmsg( LOG_WARNING, __VA_ARGS__)
#define info(...) logmsg( LOG_INFO, __VA_ARGS__)
#define debug(...) logmsg( LOG_DEBUG, __VA_ARGS__)
#define err(...) logmsg(true, LOG_ERR, __VA_ARGS__)
#define warn(...) logmsg(true, LOG_WARNING, __VA_ARGS__)
#define info(...) logmsg(true, LOG_INFO, __VA_ARGS__)
#define debug(...) logmsg(true, LOG_DEBUG, __VA_ARGS__)
#define err_perror(...) logmsg_perror( LOG_ERR, __VA_ARGS__)
#define warn_perror(...) logmsg_perror( LOG_WARNING, __VA_ARGS__)
@ -54,8 +54,8 @@ void trace_init(int enable);
void __openlog(const char *ident, int option, int facility);
void logfile_init(const char *name, const char *path, size_t size);
void passt_vsyslog(int pri, const char *format, va_list ap);
void logfile_write(int pri, const char *format, va_list ap);
void passt_vsyslog(bool newline, int pri, const char *format, va_list ap);
void logfile_write(bool newline, int pri, const char *format, va_list ap);
void __setlogmask(int mask);
#endif /* LOG_H */