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SHOPT_SPAWN: rm unused job control code (re: f207cd57, 41ebb55a)

Browse source 
Since f207cd57, sh_ntfork() is never called if job.jobcontrol is
set (i.e. if job control is active on an interactive shell), so the
code that is only run if job.jobcontrol is set should be removed.

src/cmd/ksh93/sh/xec.c:
- Remove spawnveg() define that is unused as of 7b0e0776.
- sh_exec(): Simplify SHOPT_SPAWN preprocessor logic. As sh_fork()
  never returns a negative value, only run the parent<0 check after
  running sh_ntfork() -- that check already didn't happen when
  compiling ksh with SHOPT_SPAWN disabled.
- sh_ntfork(): Remove signal and terminal handling (with race
  condition) that was only run with job.jobcontrol set.
This commit is contained in:
Martijn Dekker 2021-04-10 17:56:11 +01:00
parent 23964f89c6
commit 66c37202fd
1 changed files with 15 additions and 47 deletions
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50
src/cmd/ksh93/sh/xec.c
View file

@ -57,9 +57,6 @@
#if _lib_nice
extern int nice(int);
#endif /* _lib_nice */
#if !_lib_spawnveg
# define spawnveg(a,b,c,d) spawnve(a,b,c)
#endif /* !_lib_spawnveg */
#if SHOPT_SPAWN
static pid_t sh_ntfork(Shell_t*,const Shnode_t*,char*[],int*,int);
#endif /* SHOPT_SPAWN */
@ -1624,22 +1621,20 @@ int sh_exec(register const Shnode_t *t, int flags)
#endif
#if SHOPT_SPAWN
if(com && !job.jobcontrol)
{
parent = sh_ntfork(shp,t,com,&jobid,ntflag);
else
parent = sh_fork(shp,type,&jobid);
if(parent<0)
{
/* prevent a file descriptor leak from a 'not found' error */
if(shp->topfd > topfd)
sh_iorestore(shp,topfd,0);
sh_iorestore(shp,topfd,0); /* prevent FD leak from 'not found' */
if(shp->comsub==1 && usepipe && unpipe)
sh_iounpipe(shp);
break;
}
#else
parent = sh_fork(shp,type,&jobid);
}
else
#endif /* SHOPT_SPAWN */
parent = sh_fork(shp,type,&jobid);
}
if(job.parent=parent)
/* This is the parent branch of fork
@ -1735,7 +1730,7 @@ int sh_exec(register const Shnode_t *t, int flags)
}
sh_offstate(SH_INTERACTIVE);
/* pipe in or out */
#ifdef _lib_nice
#if _lib_nice
if((type&FAMP) && sh_isoption(SH_BGNICE))
nice(4);
#endif /* _lib_nice */
@ -3500,7 +3495,7 @@ static void sigreset(Shell_t *shp,int mode)
/*
* A combined fork/exec for systems with slow fork().
* Note: Incompatible with job control.
* Incompatible with job control on interactive shells (job.jobcontrol).
*/
static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,int flag)
{
@ -3509,7 +3504,7 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
static int savejobid;
struct checkpt *buffp = (struct checkpt*)stkalloc(shp->stk,sizeof(struct checkpt));
int otype=0, jmpval,jobfork=0;
volatile int jobwasset=0, scope=0, sigwasset=0;
volatile int scope=0, sigwasset=0;
char **arge, *path;
volatile pid_t grp = 0;
Pathcomp_t *pp;
@ -3577,17 +3572,8 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
}
arge = sh_envgen();
shp->exitval = 0;
#ifdef SIGTSTP
if(job.jobcontrol)
{
signal(SIGTTIN,SIG_DFL);
signal(SIGTTOU,SIG_DFL);
signal(SIGTSTP,SIG_DFL);
jobwasset++;
}
#endif /* SIGTSTP */
#ifdef JOBS
if(sh_isstate(SH_MONITOR) && (job.jobcontrol || (otype&FAMP)))
if(sh_isstate(SH_MONITOR) && (otype&FAMP))
{
if((otype&FAMP) || job.curpgid==0)
grp = 1;
@ -3643,17 +3629,6 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
sh_popcontext(shp,buffp);
if(buffp->olist)
free_list(buffp->olist);
#ifdef SIGTSTP
if(jobwasset)
{
signal(SIGTTIN,SIG_IGN);
signal(SIGTTOU,SIG_IGN);
if(sh_isstate(SH_INTERACTIVE))
signal(SIGTSTP,SIG_IGN);
else
signal(SIGTSTP,SIG_DFL);
}
#endif /* SIGTSTP */
if(sigwasset)
sigreset(shp,1); /* restore ignored signals */
if(scope)
@ -3673,13 +3648,6 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
#ifdef JOBS
if(grp==1)
job.curpgid = spawnpid;
# ifdef SIGTSTP
if(job.jobcontrol && grp>0 && !(otype&FAMP))
{
while(tcsetpgrp(job.fd,job.curpgid)<0 && job.curpgid!=spawnpid)
job.curpgid = spawnpid;
}
# endif /* SIGTSTP */
#endif /* JOBS */
savejobid = *jobid;
if(otype)