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/* $OpenBSD: rthread_debug.c,v 1.5 2016/09/01 10:56:46 deraadt Exp $ */
/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
#include <pthread.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "rthread.h"
REDIRECT_SYSCALL(issetugid);
int _rthread_debug_level;
/*
* Note: messages truncated at 255 characters. Could use vasprintf,
* but don't want to use malloc here so the function can be used
* in signal handlers.
*/
#define MAX_MSG_LEN 256
#define RTHREAD_ENV_DEBUG "RTHREAD_DEBUG"
/*
* format and send output to stderr if the given "level" is less than or
* equal to the current debug level. Messages with a level <= 0 will
* always be printed.
*/
void
_rthread_debug(int level, const char *fmt, ...)
{
char msg[MAX_MSG_LEN];
char *p;
int cnt;
ssize_t c;
if (_rthread_debug_level >= level) {
va_list ap;
va_start(ap, fmt);
cnt = vsnprintf(msg, MAX_MSG_LEN, fmt, ap);
va_end(ap);
if (cnt > MAX_MSG_LEN - 1)
cnt = MAX_MSG_LEN - 1;
p = msg;
do {
c = write(STDERR_FILENO, p, cnt);
if (c == -1)
break;
if (c != cnt)
sched_yield();
p += c;
cnt -= c;
} while (cnt > 0);
}
}
/*
* set the debug level from an environment string. Bogus values are
* silently ignored.
*/
void
_rthread_debug_init(void)
{
char *envp;
char *rem;
if (issetugid())
return;
envp = getenv(RTHREAD_ENV_DEBUG);
if (envp) {
_rthread_debug_level = (int) strtol(envp, &rem, 0);
if (*rem || _rthread_debug_level < 0)
_rthread_debug_level = 0;
}
}
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