From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050513 Fedora/1.7.8-1.3.1 Description of problem: The read call on /dev/lp0 is not interrupted by SGIALARM. The following progam can only be terminated by ^C or kill. The read call shall be interrupted (an alarm generated via alarm(1)), the signal is processed but the read call do not return (this was OK on 2.4 kernels) #include <stdio.h> #include <signal.h> #include <fcntl.h> typedef void (*signalHandler_t)(int); static signalHandler_t sig; static void _sigAlarm(int code); static void _sigAlarm(int code) { printf("_sigAlarm got\n"); } int main(int argc, char **argv) { char *dev = "/dev/lp0"; char buf[511]; int fd; int rd; if (argc > 1 ) dev = argv[1]; fd = open(dev, O_RDWR); if (fd > -1 ) { sig = signal(SIGALRM, _sigAlarm); alarm(1); rd = read(fd, buf,511); printf("read -> %d\n",rd); } return 0; } Version-Release number of selected component (if applicable): kernel-2.6.11-1.35_FC3 How reproducible: Always Steps to Reproduce: 1. compile provided example 2. run example 3. Actual Results: see above Expected Results: the read call shall return after the signal was processed. Additional info: All was OK on tzhe 2.4 kernels, the acual behaviour is very bad and all printer port (USB //) have different (buggy) working mode.
*** This bug has been marked as a duplicate of 163486 ***