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