http://bugzilla.kernel.org/show_bug.cgi?id=13035 Summary: select for cpufreq/ files Product: Power Management Version: 2.5 Kernel Version: 2.6.24 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: cpufreq AssignedTo: cpufreq@xxxxxxxxxxxxxxx ReportedBy: suzuki.hironobu@xxxxxxxxx Regression: No /* A code of select test for "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies" file. $cat /proc/version Linux version 2.6.24-23-generic (buildd@crested) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP Mon Jan 26 01:04:16 UTC 2009 $ cc foo.c $ ./a.out blah, blah, blah <It should not wait but it wait 10 seconds> $ I don't know that it is a bug or kind of specification of kernel. I think that "/sys/devices/......./scaling_available_frequencies" should be closed by kernel because "/proc/version" has been worked well for this sample program. By Hironobu SUZUKI <hironobu at h2np dot net> 7 Apr 2009 */ #include <stdio.h> #include <stdlib.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #include <sys/stat.h> #include <fcntl.h> main() { int fd; fd_set rfds; struct timeval tv; char buf[BUFSIZ]; FD_ZERO (&rfds); fd=open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies",O_RDONLY); /* cf. fd=open("/proc/version",O_RDONLY); */ FD_SET (fd, &rfds); tv.tv_sec = 10; tv.tv_usec = 0; while ( read(fd,&buf,BUFSIZ) > 0 ) { puts(buf); select (fd+1, &rfds, NULL, NULL, &tv); } close(fd); } -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
