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core-util: improve comments in pa_machine_id()

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Tanu Kaskinen 2015-08-12 11:37:00 +02:00 • committed by David Henningsson
parent 96b368b960
commit 96f4b4ffe3
1 changed files with 12 additions and 7 deletions
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19
src/pulsecore/core-util.c
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@ -3061,14 +3061,19 @@ char *pa_machine_id(void) {
char *h;
/* The returned value is supposed be some kind of ascii identifier
* that is unique and stable across reboots. */
/* First we try ${sysconfdir}/etc/machine-id, with fallbacks to
* ${localstatedir}/lib/dbus/machine-id, /etc/machine-id and
* /var/lib/dbus/machine-id, which are the best option we
* have, since they fit perfectly our needs and are not as volatile
* as the hostname which might be set from dhcp. */
* that is unique and stable across reboots. First we try if the machine-id
* file is available. If it's available, that's great, since it provides an
* identifier that suits our needs perfectly. If it's not, we fall back to
* the hostname, which is not as good, since it can change over time. */
/* We search for the machine-id file from four locations. The first two are
* relative to the configured installation prefix, but if we're installed
* under /usr/local, for example, it's likely that the machine-id won't be
* found there, so we also try the hardcoded paths.
*
* PA_MACHINE_ID or PA_MACHINE_ID_FALLBACK might exist on a Windows system,
* but the last two hardcoded paths certainly don't, hence we don't try
* them on Windows. */
if ((f = pa_fopen_cloexec(PA_MACHINE_ID, "r")) ||
(f = pa_fopen_cloexec(PA_MACHINE_ID_FALLBACK, "r")) ||
#if !defined(OS_IS_WIN32)