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add support to disable emulation of /dev/dsp,/dev/mixer,/dev/sndstat selectively by either passing an environment variable or by defining a symbol __padsp_disable__ in the process

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@964 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-05-25 01:14:06 +00:00
parent 2bb05ea667
commit 2bbd7bac63
1 changed files with 58 additions and 3 deletions
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61
src/utils/padsp.c
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@ -191,6 +191,61 @@ static void debug(const char *format, ...) {
}
}
static int padsp_disabled(void) {
static int *sym;
static int sym_resolved = 0;
/* If the current process has a symbol __padsp_disabled__ we use
* it to detect whether we should enable our stuff or not. A
* program needs to be compiled with -rdynamic for this to work!
* The symbol must be an int containing a three bit bitmask: bit 1
* -> disable /dev/dsp emulation, bit 2 -> disable /dev/sndstat
* emulation, bit 3 -> disable /dev/mixer emulation. Hence a value
* 7 disables padsp entirely. */
pthread_mutex_lock(&func_mutex);
if (!sym_resolved) {
sym = (int*) dlsym_fn(RTLD_DEFAULT, "__padsp_disabled__");
sym_resolved = 1;
}
pthread_mutex_unlock(&func_mutex);
if (!sym)
return 0;
return *sym;
}
static int dsp_cloak_enable(void) {
if (padsp_disabled() & 1)
return 0;
if (getenv("PADSP_NO_DSP"))
return 0;
return 1;
}
static int sndstat_cloak_enable(void) {
if (padsp_disabled() & 2)
return 0;
if (getenv("PADSP_NO_SNDSTAT"))
return 0;
return 1;
}
static int mixer_cloak_enable(void) {
if (padsp_disabled() & 4)
return 0;
if (getenv("PADSP_NO_MIXER"))
return 0;
return 1;
}
static pthread_key_t recursion_key;
static void recursion_key_alloc(void) {
@ -1010,11 +1065,11 @@ int open(const char *filename, int flags, ...) {
return _open(filename, flags, mode);
}
if (strcmp(filename, "/dev/dsp") == 0 || strcmp(filename, "/dev/adsp") == 0) {
if (dsp_cloak_enable() && (strcmp(filename, "/dev/dsp") == 0 || strcmp(filename, "/dev/adsp") == 0)) {
r = dsp_open(flags, &_errno);
} else if (strcmp(filename, "/dev/mixer") == 0) {
} else if (mixer_cloak_enable() && strcmp(filename, "/dev/mixer") == 0) {
r = mixer_open(flags, &_errno);
} else if (strcmp(filename, "/dev/sndstat") == 0) {
} else if (sndstat_cloak_enable() && strcmp(filename, "/dev/sndstat") == 0) {
r = sndstat_open(flags, &_errno);
} else {
function_exit();