I've:
Linux version 2.6.12-rc6
LSB_VERSION="1.3"
Red Hat Enterprise Linux AS release 4 (Nahant)
Gnu C gcc (GCC) 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)
Gnu make 3.80
util-linux 2.12a
mount 2.12a
modutils 3.1-pre5
e2fsprogs 1.35
pcmcia-cs 3.2.7
PPP 2.4.2
isdn4k-utils 3.3
Linux C Library 2.3.4
Dynamic linker (ldd) 2.3.4
this behavior is new:
alarm() does not return the number of seconds remaining until any
previously scheduled alarm was due to be delivered
but
it returns (the number of seconds remaining + 1)
(with 2.6.10 and previous, 1 was not added to the returned value)
----------------------------------------------------------------------------------
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
int almreceived = 0; /* flag to indicate SIGALRM received or not */
void setup(); /* Main setup function of test */
void sigproc(int sig); /* signal catching function */
int
main(int ac, char **av)
{
int time_sec1 = 10; /* time for which 1st alarm is set */
int time_sec2 = 5; /* time for which 2st alarm is set */
int ret_val1, ret_val2; /* return values for alarm() calls */
int ret_val3;
int sleep_time1 = 3; /* waiting time for the signal */
int sleep_time2 = 6; /* waiting time for the signal */
/* Perform global setup for test */
setup();
/*
* Call First alarm() with non-zero time parameter
* 'time_sec1' to send SIGALRM to the calling process.
*/
ret_val1 = (alarm(time_sec1));
/* Wait for signal SIGALARM */
sleep(sleep_time1);
/*
* Call Second alarm() with non-zero time parameter
* 'time_sec2' to send SIGALRM to the calling process.
*/
ret_val2 = (alarm(time_sec2));
/* Wait for signal SIGALRM */
sleep(sleep_time2);
/*
* Check whether the second alarm() call returned
* the amount of time previously remaining in the
* alarm clock of the calling process, and
* sigproc() executed when SIGALRM received by the
* process, the variable almreceived is set.
*/
printf("ret_val2 returned = %d \n",ret_val2);
printf("ret_val2 expected = %d\n",time_sec1 - sleep_time1);
if ((almreceived == 1) &&
(ret_val2 == (time_sec1 - sleep_time1))) {
/*
* Make sure the system cleaned up the alarm
* after it delivered it.
*/
ret_val3 = (alarm(0));
if (ret_val3 != 0) {
printf("System did not "
"clean up delivered "
"alarm");
} else {
printf("Functionality of "
"alarm(%u) successful",
time_sec2);
}
} else {
printf("alarm(%u) fails, returned %d, "
"almreceived:%d",
time_sec2, ret_val2, almreceived);
}
return 0;
/*NOTREACHED*/
}
/*
* sigproc(int) - This function defines the action that has to be taken
* when the SIGALRM signal is caught.
* It also sets the variable which is used to check whether the
* alarm system call was successful.
*/
void
sigproc(int sig)
{
almreceived = almreceived + 1;
}
/*
* setup() - performs all ONE TIME setup for this test.
* Setup the signal handler to catch SIGALRM.
*/
void
setup()
{
if (signal(SIGALRM, sigproc) == SIG_ERR) {
printf("signal() fails to catch SIGALARM, errno=%d",
errno);
}
}
-----------------------------------------------------------
result:
------
ret_val2 returned = 8
ret_val2 expected = 7
I'm interested knowing what is the expected behavior ...
many thanks,
--
Jacky Malcles B1-403 Email : [email protected]
Bull SA, 1 rue de Provence, B.P 208, 38432 Echirolles CEDEX, FRANCE
Tel : 04.76.29.73.14
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