diff options
Diffstat (limited to 'audio/artswrapper/files/artswrapper.c')
-rw-r--r-- | audio/artswrapper/files/artswrapper.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/audio/artswrapper/files/artswrapper.c b/audio/artswrapper/files/artswrapper.c new file mode 100644 index 000000000000..eb86fd23417c --- /dev/null +++ b/audio/artswrapper/files/artswrapper.c @@ -0,0 +1,114 @@ +#include <stdio.h> +#include <sys/stat.h> +#include <sys/resource.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <stdlib.h> + +/* + * adjust_priority + * + * sets realtime priority + */ + +#ifdef HAVE_REALTIME_SCHED +#include <sched.h> + +void adjust_priority() +{ + int sched = sched_getscheduler(0); + if(sched == SCHED_FIFO || sched == SCHED_RR) + { + printf(">> since the scheduling policy is not standard, I assume\n"); + printf(" it has been adjusted to fit the needs of realtime audio\n"); + } + else + { + struct sched_param sp; + long priority = (sched_get_priority_max(SCHED_FIFO) + + sched_get_priority_min(SCHED_FIFO))/2; + + sp.sched_priority = priority; + + if(sched_setscheduler(0, SCHED_FIFO, &sp) != -1) + { + printf(">> running as realtime process now (priority %ld)\n", + priority); + putenv("STARTED_THROUGH_ARTSWRAPPER=1"); + } + else + { + /* can't set realtime priority */ + putenv("STARTED_THROUGH_ARTSWRAPPER=2"); + } + } +} +#else +void adjust_priority() +{ + int prio; + + prio = getpriority(PRIO_PROCESS,getpid()); + if(prio > -10) + { + setpriority(PRIO_PROCESS,getpid(),-17); + prio = getpriority(PRIO_PROCESS,getpid()); + } + + /* no system support for realtime priority */ + putenv("STARTED_THROUGH_ARTSWRAPPER=3"); + + if(prio > -10) { + printf(">> synthesizer priority is %d (which is unacceptable,",prio); + printf(" try running as root)\n"); + } + else { + printf(">> synthesizer priority is %d (which is the best\n",prio); + printf(" we can get out of a non realtime system)\n"); + } +} +#endif + +int main(int argc, char **argv) +{ + if(argc == 2) + { + if(strcmp(argv[1],"check") == 0) + { + /* backward compatibility with old artswrapper */ + printf("okay\n"); + return 0; + } + } + + adjust_priority(); + + /* drop root privileges if running setuid root + (due to realtime priority stuff) */ + if (geteuid() != getuid()) + { +#if defined (HAVE_SETEUID) && !defined (HAVE_SETEUID_FAKE) + seteuid(getuid()); +#else + setreuid(-1, getuid()); +#endif + } + + if(argc == 0) + return 1; + +/* + * Real-time status is passed to artsd via the environment variable + * STARTED_THROUGH_ARTSWRAPPER. It has one of the following values: + * + * unset - not running as real-time + * 1 - running as real-time + * 2 - no privileges to set real-time scheduling + * 3 - no support for real-time scheduling + */ + argv[0] = EXECUTE; + execv(EXECUTE,argv); + perror(EXECUTE); + return 1; +} |