/*
- * Copyright (C) 2008-2011 Tobias Brunner
+ * Copyright (C) 2008-2012 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
#include <limits.h>
#include <dirent.h>
#include <time.h>
+#include <pthread.h>
#include "enum.h"
#include "debug.h"
return TRUE;
}
+
+/**
+ * The size of the thread-specific error buffer
+ */
+#define STRERROR_BUF_LEN 256
+
+/**
+ * Key to store thread-specific error buffer
+ */
+static pthread_key_t strerror_buf_key;
+
+/**
+ * Only initialize the key above once
+ */
+static pthread_once_t strerror_buf_key_once = PTHREAD_ONCE_INIT;
+
+/**
+ * Create the key used for the thread-specific error buffer
+ */
+static void create_strerror_buf_key()
+{
+ pthread_key_create(&strerror_buf_key, free);
+}
+
+/**
+ * Retrieve the error buffer assigned to the current thread (or create it)
+ */
+static inline char *get_strerror_buf()
+{
+ char *buf;
+
+ pthread_once(&strerror_buf_key_once, create_strerror_buf_key);
+ buf = pthread_getspecific(strerror_buf_key);
+ if (!buf)
+ {
+ buf = malloc(STRERROR_BUF_LEN);
+ pthread_setspecific(strerror_buf_key, buf);
+ }
+ return buf;
+}
+
+#ifdef HAVE_STRERROR_R
+/*
+ * Described in header.
+ */
+const char *safe_strerror(int errnum)
+{
+ char *buf = get_strerror_buf(), *msg;
+
+#ifdef STRERROR_R_CHAR_P
+ /* char* version which may or may not return the original buffer */
+ msg = strerror_r(errnum, buf, STRERROR_BUF_LEN);
+#else
+ /* int version returns 0 on success */
+ msg = strerror_r(errnum, buf, STRERROR_BUF_LEN) ? "Unknown error" : buf;
+#endif
+ return msg;
+}
+#else /* HAVE_STRERROR_R */
+/*
+ * Described in header.
+ */
+const char *safe_strerror(int errnum)
+{
+ static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+ char *buf = get_strerror_buf();
+
+ /* use a mutex to ensure calling strerror(3) is thread-safe */
+ pthread_mutex_lock(&mutex);
+ strncpy(buf, strerror(errnum), STRERROR_BUF_LEN);
+ pthread_mutex_unlock(&mutex);
+ buf[STRERROR_BUF_LEN - 1] = '\0';
+ return buf;
+}
+#endif /* HAVE_STRERROR_R */
+
+
#ifndef HAVE_CLOSEFROM
/**
* Described in header.
}
#ifndef HAVE_GCC_ATOMIC_OPERATIONS
-#include <pthread.h>
/**
* We use a single mutex for all refcount variables.
/*
- * Copyright (C) 2008-2011 Tobias Brunner
+ * Copyright (C) 2008-2012 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
*/
bool mkdir_p(const char *path, mode_t mode);
+/**
+ * Thread-safe wrapper around strerror and strerror_r.
+ *
+ * This is required because the first is not thread-safe (on some platforms)
+ * and the second uses two different signatures (POSIX/GNU) and is impractical
+ * to use anyway.
+ *
+ * @param errnum error code (i.e. errno)
+ * @return error message
+ */
+const char *safe_strerror(int errnum);
+
#ifndef HAVE_CLOSEFROM
/**
* Close open file descriptors greater than or equal to lowfd.
*/
bool cas_ptr(void **ptr, void *oldval, void *newval);
-
#endif /* HAVE_GCC_ATOMIC_OPERATIONS */
/**