ALARM(3) BSD Programmer's Manual ALARM(3)
alarm - set signal timer alarm
#include <unistd.h> unsigned int alarm(unsigned int seconds);
This interface is made obsolete by setitimer(2). The alarm() function waits a count of seconds before asserting the ter- minating signal SIGALRM. When the signal has successfully been caught, alarm() returns the amount of time left on the clock. The maximum number of seconds allowed is 100000000. If an alarm has been set with alarm(), another call to alarm() will su- persede the prior call. The request alarm(0) voids the current alarm.
If the call succeeds, any time left remaining from a previous call is re- turned. If an error occurs, the value -1 is returned, and a more precise error code is placed in the global variable errno.
setitimer(2), sigaction(2), signal(3), sigpause(3), sigvec(3), sleep(3), ualarm(3), usleep(3)
The alarm() function conforms to IEEE Std 1003.1-1990 ("POSIX").
An alarm() function appeared in Version 7 AT&T UNIX. MirOS BSD #10-current April 19, 1994 1
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