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gutils: Add functions for working with environment arrays

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When spawning a child process, it is not safe to call setenv() before
the fork() (because setenv() isn't thread-safe), but it's also not
safe to call it after the fork() (because it's not async-signal-safe).
So the only safe way to alter the environment for a child process from
a threaded program is to pass a fully-formed envp array to
exec*/g_spawn*/etc.

So, add g_environ_getenv(), g_environ_setenv(), and
g_environ_unsetenv(), which act like their namesakes, but work on
arbitrary arrays rather than working directly on the environment.

http://bugzilla.gnome.org/show_bug.cgi?id=659326
This commit is contained in:
Dan Winship
2011-10-15 15:52:28 -04:00
committed by Matthias Clasen
parent 5ff803d91f
commit 409d93148f
5 changed files with 225 additions and 48 deletions
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27
glib/gutils.h
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@@ -265,17 +265,26 @@ void g_nullify_pointer (gpointer *nullify_location);
#endif
#endif
const gchar * g_getenv (const gchar *variable);
gboolean g_setenv (const gchar *variable,
const gchar *value,
gboolean overwrite);
void g_unsetenv (const gchar *variable);
gchar** g_listenv (void);
gchar** g_get_environ (void);
const gchar * g_getenv (const gchar *variable);
gboolean g_setenv (const gchar *variable,
const gchar *value,
gboolean overwrite);
void g_unsetenv (const gchar *variable);
gchar ** g_listenv (void);
gchar ** g_get_environ (void);
const gchar * g_environ_getenv (gchar **envp,
const gchar *variable);
gchar ** g_environ_setenv (gchar **envp,
const gchar *variable,
const gchar *value,
gboolean overwrite) G_GNUC_WARN_UNUSED_RESULT;
gchar ** g_environ_unsetenv (gchar **envp,
const gchar *variable) G_GNUC_WARN_UNUSED_RESULT;
/* private */
const gchar* _g_getenv_nomalloc (const gchar *variable,
gchar buffer[1024]);
const gchar* _g_getenv_nomalloc (const gchar *variable,
gchar buffer[1024]);
/**
* GVoidFunc: