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Fix SIGHUP on termination (Solaris patch 260-22964338)

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This fixes the following bug filed with Solaris: "22964338 ksh93
appears to send SIGHUP to unrelated processes on occasion". It is
fixed by applying this patch by Lijo George from the Solaris repo:
https://github.com/oracle/solaris-userland/blob/master/components/ksh93/patches/260-22964338.patch

The ksh2020 upstream rejected this, but if it's in production use
in Solaris, Solaris, it's probably good enough for 93u+m. If any
breakage is left, it can be fixed later.
https://github.com/att/ast/pull/1

src/cmd/ksh93/include/jobs.h,
src/cmd/ksh93/sh/fault.c,
src/cmd/ksh93/sh/jobs.c:
- Use a new job_hup() function instead of job_kill() to send SIGHUP
  to job processes on termination. The new function checks if a job
  is in fact still live before issuing SIGHUP to it.
This commit is contained in:
Martijn Dekker 2021-01-08 17:33:04 +00:00
parent ab98ec65e4
commit 62cf88d0df
3 changed files with 50 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/cmd/ksh93/sh/fault.c
View file

@ -634,7 +634,7 @@ void sh_done(void *ptr, register int sig)
#endif
#ifdef JOBS
if((sh_isoption(SH_INTERACTIVE) && shp->login_sh) || (!sh_isoption(SH_INTERACTIVE) && (sig==SIGHUP)))
job_walk(sfstderr,job_terminate,SIGHUP,NIL(char**));
job_walk(sfstderr, job_hup, SIGHUP, NIL(char**));
#endif /* JOBS */
job_close(shp);
if(nv_search("VMTRACE", shp->var_tree,0))

48
src/cmd/ksh93/sh/jobs.c
View file

@ -1072,6 +1072,54 @@ int job_kill(register struct process *pw,register int sig)
return(r);
}
/*
* Similar to job_kill, but dedicated to SIGHUP handling when session is
* being disconnected.
*/
int job_hup(struct process *pw, int sig)
{
struct process *px;
pid_t pid;
int r;
NOT_USED(sig);
if(pw->p_pgrp == 0 || (pw->p_flag & P_DISOWN))
return(0);
job_lock();
if(pw->p_pgrp != 0)
{
int palive = 0;
for(px = pw; px != NULL; px = px->p_nxtproc)
{
if((px->p_flag & P_DONE) == 0)
{
palive = 1;
break;
}
}
/*
* If all the processes have died, there is no guarantee that
* p_pgrp is still the valid process group that we made, i.e.,
* the PID may have been recycled and the same p_pgrp may have
* been assigned to unrelated processes.
*/
if(palive)
{
if(killpg(pw->p_pgrp, SIGHUP) >= 0)
job_unstop(pw);
}
}
for(; pw != NULL && pw->p_pgrp == 0; pw = pw->p_nxtproc)
{
if(pw->p_flag & P_DONE)
continue;
if(kill(pw->p_pid, SIGHUP) >= 0)
(void)kill(pw->p_pid, SIGCONT);
pw = pw->p_nxtproc;
}
job_unlock();
return(0);
}
/*
* Get process structure from first letters of jobname
*