Implement an RFTSIGZMB flag to rfork(2) to specify a signal that is
delivered to parent when the child exists. Submitted by: Petr Salinger <Petr.Salinger seznam cz> (Debian/kFreeBSD) MFC after: 1 week X-MFC-note: bump __FreeBSD_version
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=223966
@ -476,7 +476,10 @@ do_fork(struct thread *td, int flags, struct proc *p2, struct thread *td2,
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sigacts_copy(newsigacts, p1->p_sigacts);
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p2->p_sigacts = newsigacts;
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}
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if (flags & RFLINUXTHPN)
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if (flags & RFTSIGZMB)
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p2->p_sigparent = RFTSIGNUM(flags);
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else if (flags & RFLINUXTHPN)
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p2->p_sigparent = SIGUSR1;
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else
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p2->p_sigparent = SIGCHLD;
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@ -719,10 +722,22 @@ fork1(struct thread *td, int flags, int pages, struct proc **procp)
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static int curfail;
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static struct timeval lastfail;
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/* Check for the undefined or unimplemented flags. */
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if ((flags & ~(RFFLAGS | RFTSIGFLAGS(RFTSIGMASK))) != 0)
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return (EINVAL);
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/* Signal value requires RFTSIGZMB. */
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if ((flags & RFTSIGFLAGS(RFTSIGMASK)) != 0 && (flags & RFTSIGZMB) == 0)
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return (EINVAL);
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/* Can't copy and clear. */
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if ((flags & (RFFDG|RFCFDG)) == (RFFDG|RFCFDG))
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return (EINVAL);
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/* Check the validity of the signal number. */
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if ((flags & RFTSIGZMB) != 0 && (u_int)RFTSIGNUM(flags) > _SIG_MAXSIG)
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return (EINVAL);
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p1 = td->td_proc;
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/*
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@ -180,8 +180,16 @@
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#define RFLINUXTHPN (1<<16) /* do linux clone exit parent notification */
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#define RFSTOPPED (1<<17) /* leave child in a stopped state */
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#define RFHIGHPID (1<<18) /* use a pid higher than 10 (idleproc) */
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#define RFTSIGZMB (1<<19) /* select signal for exit parent notification */
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#define RFTSIGSHIFT 20 /* selected signal number is in bits 20-27 */
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#define RFTSIGMASK 0xFF
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#define RFTSIGNUM(flags) (((flags) >> RFTSIGSHIFT) & RFTSIGMASK)
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#define RFTSIGFLAGS(signum) ((signum) << RFTSIGSHIFT)
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#define RFPPWAIT (1<<31) /* parent sleeps until child exits (vfork) */
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#define RFKERNELONLY (RFSTOPPED | RFHIGHPID | RFPPWAIT)
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#define RFFLAGS (RFFDG | RFPROC | RFMEM | RFNOWAIT | RFCFDG | \
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RFTHREAD | RFSIGSHARE | RFLINUXTHPN | RFSTOPPED | RFHIGHPID | RFTSIGZMB | \
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RFPPWAIT)
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#endif /* __BSD_VISIBLE */
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