2 * gmisc.c: Misc functions with no place to go (right now)
5 * Aaron Bockover (abockover@novell.com)
7 * (C) 2006 Novell, Inc.
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42 static pthread_mutex_t env_lock = PTHREAD_MUTEX_INITIALIZER;
46 * As per the UNIX spec,
47 * "The return value from getenv() may point to static data which may be overwritten by subsequent calls to getenv(), setenv(), or unsetenv()."
48 * Source: Unix Manual Pages for getenv, IEEE Std 1003.1
50 * This means that using pointers returned from getenv may (and does) lead to many
51 * pointers which refer to the same piece of memory. When one is freed, all will be freed.
53 * This is unsafe and an ergonomics risk to fix in the callers. While the caller could lock,
54 * this introduces the risk for looping or exiting while inside of a lock. For this reason,
55 * g_getenv does not mimic the behavior of POSIX getenv anymore.
57 * The memory address returned will be unique to the invocaton, and must be freed.
60 g_getenv (const gchar *variable)
63 pthread_mutex_lock (&env_lock);
64 gchar *res = getenv(variable);
67 pthread_mutex_unlock (&env_lock);
73 * This function checks if the given variable is non-NULL
74 * in the environment. It's useful because it removes memory
75 * freeing requirements.
79 g_hasenv (const gchar *variable)
81 pthread_mutex_lock (&env_lock);
82 gchar *res = getenv(variable);
83 gboolean not_null = (res != NULL);
84 pthread_mutex_unlock (&env_lock);
90 g_setenv(const gchar *variable, const gchar *value, gboolean overwrite)
93 pthread_mutex_lock (&env_lock);
94 res = (setenv(variable, value, overwrite) == 0);
95 pthread_mutex_unlock (&env_lock);
100 g_unsetenv(const gchar *variable)
102 pthread_mutex_lock (&env_lock);
104 pthread_mutex_unlock (&env_lock);
108 g_win32_getlocale(void)
114 g_path_is_absolute (const char *filename)
116 g_return_val_if_fail (filename != NULL, FALSE);
118 return (*filename == '/');
121 static pthread_mutex_t pw_lock = PTHREAD_MUTEX_INITIALIZER;
122 static const gchar *home_dir;
123 static const gchar *user_name;
128 #ifdef HAVE_GETPWUID_R
130 struct passwd *result;
134 if (user_name != NULL)
137 pthread_mutex_lock (&pw_lock);
138 if (user_name != NULL) {
139 pthread_mutex_unlock (&pw_lock);
143 home_dir = g_getenv ("HOME");
144 user_name = g_getenv ("USER");
146 #ifdef HAVE_GETPWUID_R
147 if (home_dir == NULL || user_name == NULL) {
148 if (getpwuid_r (getuid (), &pw, buf, 4096, &result) == 0) {
149 if (home_dir == NULL)
150 home_dir = g_strdup (pw.pw_dir);
151 if (user_name == NULL)
152 user_name = g_strdup (pw.pw_name);
157 if (user_name == NULL)
158 user_name = "somebody";
159 if (home_dir == NULL)
162 pthread_mutex_unlock (&pw_lock);
166 g_get_home_dir (void)
173 g_get_user_name (void)
179 static const char *tmp_dir;
181 static pthread_mutex_t tmp_lock = PTHREAD_MUTEX_INITIALIZER;
186 if (tmp_dir == NULL){
187 pthread_mutex_lock (&tmp_lock);
188 if (tmp_dir == NULL){
189 tmp_dir = g_getenv ("TMPDIR");
190 if (tmp_dir == NULL){
191 tmp_dir = g_getenv ("TMP");
192 if (tmp_dir == NULL){
193 tmp_dir = g_getenv ("TEMP");
199 pthread_mutex_unlock (&tmp_lock);