reboot
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From: neilsolent on 12 Jan 2010 17:20 Hi The C program below certainly reboots my Solaris 10 system, but it does not seem to do it cleanly (doesn't send SIGTERM to the running processes). If I run the Solaris reboot command though, that does seem to cleanly reboot. How come? [code] #include <sys/reboot.h> int main(int argc, char* argv[]) { reboot(RB_AUTOBOOT, NULL); return 0; } [/code]
From: John Gordon on 12 Jan 2010 17:22 In <b7e4da0b-bd35-4233-98da-ee6ba2ea1d77(a)j19g2000yqk.googlegroups.com> neilsolent <n(a)solenttechnology.co.uk> writes: > The C program below certainly reboots my Solaris 10 system, but it > does not seem to do it cleanly (doesn't send SIGTERM to the running > processes). If I run the Solaris reboot command though, that does seem > to cleanly reboot. > How come? At a guess, because the reboot command does more than just call reboot(). -- John Gordon A is for Amy, who fell down the stairs gordon(a)panix.com B is for Basil, assaulted by bears -- Edward Gorey, "The Gashlycrumb Tinies"
From: Scott Lurndal on 12 Jan 2010 17:24 neilsolent <n(a)solenttechnology.co.uk> writes: >Hi > >The C program below certainly reboots my Solaris 10 system, but it >does not seem to do it cleanly (doesn't send SIGTERM to the running >processes). If I run the Solaris reboot command though, that does seem >to cleanly reboot. >How come? > > >[code] > >#include <sys/reboot.h> > >int main(int argc, char* argv[]) >{ > reboot(RB_AUTOBOOT, NULL); > return 0; >} > >[/code] because the reboot(2) system call is not intended to be used by user applications. If you want to initiate a reboot from a (suitably privileged) user application call the 'shutdown' utility using the system(3) library function (which will, after running all the appropriate shutdown scripts in /etc/init.d, execute the reboot(2) system call itself).
From: David Schwartz on 12 Jan 2010 23:17 On Jan 12, 2:20 pm, neilsolent <n...(a)solenttechnology.co.uk> wrote: > The C program below certainly reboots my Solaris 10 system, but it > does not seem to do it cleanly (doesn't send SIGTERM to the running > processes). If I run the Solaris reboot command though, that does seem > to cleanly reboot. > How come? The reboot command sends a SIGTERM to the running process before rebooting and your code doesn't. Your question is self-answering. Your code doesn't send a SIGTERM to the running processes because it contains no code that would do that anywhere in it. It simply commands the system to reboot, so that's what happens. DS
From: Barry Margolin on 13 Jan 2010 00:53
In article <9711e184-7cb6-46e4-9c55-d4b7bd03aea4(a)j19g2000yqk.googlegroups.com>, David Schwartz <davids(a)webmaster.com> wrote: > On Jan 12, 2:20�pm, neilsolent <n...(a)solenttechnology.co.uk> wrote: > > > The C program below certainly reboots my Solaris 10 system, but it > > does not seem to do it cleanly (doesn't send SIGTERM to the running > > processes). If I run the Solaris reboot command though, that does seem > > to cleanly reboot. > > How come? > > The reboot command sends a SIGTERM to the running process before > rebooting and your code doesn't. Your question is self-answering. Your > code doesn't send a SIGTERM to the running processes because it > contains no code that would do that anywhere in it. It simply commands > the system to reboot, so that's what happens. > > DS More to the point, the reboot() system call is what the reboot command calls AFTER it has broadcast a shutdown notice on all the terminals, sent all the SIGTERMs, etc. Eventually it has to tell the OS to reboot, and it does it using this system call. -- Barry Margolin, barmar(a)alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** |