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crtools: make to be able to split messages by pid

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If the option --log-pid is set, each process will have an own log file.
Otherwise PID is added to each log message.

A message can't be bigger than one page minus some bytes for pid.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-05-02 14:42:00 +04:00
committed by Pavel Emelyanov
parent ad7c18a1d4
commit fc7bedc50a
6 changed files with 48 additions and 4 deletions
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34
log.c
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@@ -23,6 +23,9 @@
static unsigned int current_loglevel = DEFAULT_LOGLEVEL;
static int current_logfd = DEFAULT_LOGFD;
static char buffer[PAGE_SIZE];
static char buf_off = 0;
int log_get_fd(void)
{
return current_logfd;
@@ -67,6 +70,23 @@ err:
return -1;
}
int log_init_by_pid(void)
{
char path[PATH_MAX];
if (!opts.log_file_per_pid) {
buf_off = snprintf(buffer, PAGE_SIZE, "%6d: ", getpid());
return 0;
}
if (!opts.output)
return 0;
snprintf(path, PATH_MAX, "%s.%d", opts.output, getpid());
return log_init(path);
}
void log_fini(void)
{
if (current_logfd > 2)
@@ -86,7 +106,7 @@ void log_set_loglevel(unsigned int level)
void print_on_level(unsigned int loglevel, const char *format, ...)
{
va_list params;
int fd;
int fd, size, ret, off;
if (unlikely(loglevel == LOG_MSG)) {
fd = STDOUT_FILENO;
@@ -97,6 +117,16 @@ void print_on_level(unsigned int loglevel, const char *format, ...)
}
va_start(params, format);
vdprintf(fd, format, params);
size = vsnprintf(buffer + buf_off, PAGE_SIZE - buf_off, format, params);
va_end(params);
size += buf_off;
off = 0;
while (off < size) {
ret = write(fd, buffer + off, size - off);
if (ret <= 0)
break;
off += ret;
}
}