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git://git.code.sf.net/p/cdesktopenv/code
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cleanup: remove legacy code for systems without fork(2)
In 2021, it seems like it's about time to join the 21st century and officially require fork(2). In practice this was already the case as the legacy code was unmaintained and didn't compile.
This commit is contained in:
Martijn Dekker
parent
38f2b94f55
commit
7b0e0776e2
7 changed files with 7 additions and 269 deletions
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@ -1617,15 +1617,10 @@ int sh_exec(register const Shnode_t *t, int flags)
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fifo_save_ppid = shgd->current_pid;
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#endif
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#if SHOPT_SPAWN
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# ifdef _lib_fork
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if(com && !job.jobcontrol)
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parent = sh_ntfork(shp,t,com,&jobid,ntflag);
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else
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parent = sh_fork(shp,type,&jobid);
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# else
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if((parent = sh_ntfork(shp,t,com,&jobid,ntflag))<=0)
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break;
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# endif /* _lib_fork */
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if(parent<0)
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{
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/* prevent a file descriptor leak from a 'not found' error */
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@ -3458,85 +3453,6 @@ static void coproc_init(Shell_t *shp, int pipes[])
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#if SHOPT_SPAWN
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#if !defined(_lib_fork)
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/*
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* create a shell script consisting of t->fork.forktre and execute it
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*/
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static int run_subshell(Shell_t *shp,const Shnode_t *t,pid_t grp)
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{
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static const char prolog[] = "(print $(typeset +A);set; typeset -p; print .sh.dollar=$$;set +o)";
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register int i, fd, trace = sh_isoption(SH_XTRACE);
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int pin,pout;
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pid_t pid;
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char *arglist[3], *envlist[2], devfd[12], *cp;
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Sfio_t *sp = sftmp(0);
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envlist[0] = "_=" SH_ID;
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envlist[1] = 0;
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arglist[0] = error_info.id?error_info.id:shp->shname;
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if(*arglist[0]=='-')
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arglist[0]++;
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arglist[1] = devfd;
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strncpy(devfd,e_devfdNN,sizeof(devfd));
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arglist[2] = 0;
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sfstack(sfstdout,sp);
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if(trace)
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sh_offoption(SH_XTRACE);
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sfwrite(sfstdout,"typeset -A -- ",14);
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sh_trap(prolog,0);
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nv_scan(shp->fun_tree, print_fun, (void*)0,0, 0);
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if(shp->st.dolc>0)
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{
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/* pass the positional parameters */
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char **argv = shp->st.dolv+1;
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sfwrite(sfstdout,"set --",6);
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while(*argv)
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sfprintf(sfstdout," %s",sh_fmtq(*argv++));
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sfputc(sfstdout,'\n');
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}
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pin = (shp->inpipe?shp->inpipe[1]:0);
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pout = (shp->outpipe?shp->outpipe[0]:0);
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for(i=3; i < 10; i++)
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{
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if(shp->fdstatus[i]&IOCLEX && i!=pin && i!=pout)
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{
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sfprintf(sfstdout,"exec %d<&%d\n",i,i);
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fcntl(i,F_SETFD,0);
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}
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}
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sfprintf(sfstdout,"LINENO=%d\n",t->fork.forkline);
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if(trace)
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{
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sfwrite(sfstdout,"set -x\n",7);
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sh_onoption(SH_XTRACE);
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}
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sfstack(sfstdout,NIL(Sfio_t*));
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sh_deparse(sp,t->fork.forktre,0);
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sfseek(sp,(Sfoff_t)0,SEEK_SET);
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fd = sh_dup(sffileno(sp));
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cp = devfd+8;
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if(fd>9)
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*cp++ = '0' + (fd/10);
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*cp++ = '0' + fd%10;
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*cp = 0;
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sfclose(sp);
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sfsync(NIL(Sfio_t*));
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if(!shp->gd->shpath)
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shp->gd->shpath = pathshell();
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pid = spawnveg(shp->shpath,arglist,envlist,grp);
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close(fd);
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for(i=3; i < 10; i++)
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{
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if(shp->fdstatus[i]&IOCLEX && i!=pin && i!=pout)
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fcntl(i,F_SETFD,FD_CLOEXEC);
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}
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if(pid <=0)
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errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,arglist[0]);
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return(pid);
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}
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#endif /* !_lib_fork */
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static void sigreset(Shell_t *shp,int mode)
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{
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register char *trap;
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@ -3551,7 +3467,7 @@ static void sigreset(Shell_t *shp,int mode)
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}
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/*
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* A combined fork/exec for systems with slow or non-existent fork()
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* A combined fork/exec for systems with slow fork().
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* Note: Incompatible with job control.
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*/
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static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,int flag)
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@ -3570,145 +3486,6 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
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otype = savetype;
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savetype=0;
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}
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# if !defined(_lib_fork)
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if(!argv)
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{
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register Shnode_t *tchild = t->fork.forktre;
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int optimize=0;
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otype = t->tre.tretyp;
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savetype = otype;
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spawnpid = 0;
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# ifndef _lib_fork
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if((tchild->tre.tretyp&COMMSK)==TCOM)
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{
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Namval_t *np = (Namval_t*)(tchild->com.comnamp);
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if(np)
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{
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path = nv_name(np);
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if(!nv_isattr(np,BLT_ENV))
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np=0;
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else if(strcmp(path,"echo")==0 || memcmp(path,"print",5)==0)
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np=0;
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}
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else if(!tchild->com.comarg)
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optimize=1;
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else if(tchild->com.comtyp&COMSCAN)
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{
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if(tchild->com.comarg->argflag&ARG_RAW)
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path = tchild->com.comarg->argval;
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else
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path = 0;
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}
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else
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path = ((struct dolnod*)tchild->com.comarg)->dolval[ARG_SPARE];
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if(!np && path && !nv_search(path,shp->fun_tree,0))
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optimize=1;
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}
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# endif
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sh_pushcontext(shp,buffp,SH_JMPIO);
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jmpval = sigsetjmp(buffp->buff,0);
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{
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if((otype&FINT) && !sh_isstate(SH_MONITOR))
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{
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signal(SIGQUIT,SIG_IGN);
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signal(SIGINT,SIG_IGN);
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if(!shp->st.ioset)
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{
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sh_iosave(shp,0,buffp->topfd,(char*)0);
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sh_iorenumber(shp,sh_chkopen(e_devnull),0);
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}
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}
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if(otype&FPIN)
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{
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int fd = shp->inpipe[1];
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sh_iosave(shp,0,buffp->topfd,(char*)0);
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sh_iorenumber(shp,shp->inpipe[0],0);
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if(fd>=0 && (!(otype&FPOU) || (otype&FCOOP)) && fcntl(fd,F_SETFD,FD_CLOEXEC)>=0)
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shp->fdstatus[fd] |= IOCLEX;
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}
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if(otype&FPOU)
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{
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sh_iosave(shp,1,buffp->topfd,(char*)0);
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sh_iorenumber(shp,sh_dup(shp->outpipe[1]),1);
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if(fcntl(shp->outpipe[0],F_SETFD,FD_CLOEXEC)>=0)
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shp->fdstatus[shp->outpipe[0]] |= IOCLEX;
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}
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if(t->fork.forkio)
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sh_redirect(shp,t->fork.forkio,0);
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if(optimize==0)
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{
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#ifdef SIGTSTP
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if(job.jobcontrol)
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{
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signal(SIGTTIN,SIG_DFL);
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signal(SIGTTOU,SIG_DFL);
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signal(SIGTSTP,SIG_DFL);
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}
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#endif /* SIGTSTP */
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#ifdef JOBS
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if(sh_isstate(SH_MONITOR) && (job.jobcontrol || (otype&FAMP)))
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{
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if((otype&FAMP) || job.curpgid==0)
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grp = 1;
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else
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grp = job.curpgid;
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}
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#endif /* JOBS */
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spawnpid = run_subshell(shp,t,grp);
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}
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else
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{
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sh_exec(tchild,SH_NTFORK);
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if(jobid)
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*jobid = savejobid;
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}
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}
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sh_popcontext(shp,buffp);
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if((otype&FINT) && !sh_isstate(SH_MONITOR))
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{
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signal(SIGQUIT,sh_fault);
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signal(SIGINT,sh_fault);
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}
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if((otype&FPIN) && (!(otype&FPOU) || (otype&FCOOP)) && fcntl(shp->inpipe[1],F_SETFD,FD_CLOEXEC)>=0)
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shp->fdstatus[shp->inpipe[1]] &= ~IOCLEX;
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if(t->fork.forkio || otype)
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sh_iorestore(shp,buffp->topfd,jmpval);
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if(optimize==0)
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{
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#ifdef SIGTSTP
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if(job.jobcontrol)
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{
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signal(SIGTTIN,SIG_IGN);
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signal(SIGTTOU,SIG_IGN);
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if(sh_isstate(SH_INTERACTIVE))
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signal(SIGTSTP,SIG_IGN);
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else
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signal(SIGTSTP,SIG_DFL);
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}
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#endif /* SIGTSTP */
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if(spawnpid>0)
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_sh_fork(shp,spawnpid,otype,jobid);
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if(job.jobcontrol && grp>0 && !(otype&FAMP))
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{
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while(tcsetpgrp(job.fd,job.curpgid)<0 && job.curpgid!=spawnpid)
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job.curpgid = spawnpid;
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}
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}
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savetype=0;
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if(jmpval>SH_JMPIO)
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siglongjmp(*shp->jmplist,jmpval);
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if(spawnpid<0 && (otype&FCOOP))
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{
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sh_close(shp->coutpipe);
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sh_close(shp->cpipe[1]);
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shp->cpipe[1] = -1;
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shp->coutpipe = -1;
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}
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shp->exitval = 0;
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return(spawnpid);
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}
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# endif /* !_lib_fork */
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sh_pushcontext(shp,buffp,SH_JMPCMD);
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errorpush(&buffp->err,ERROR_SILENT);
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job_lock(); /* errormsg will unlock */
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@ -3874,14 +3651,4 @@ static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,in
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return(spawnpid);
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}
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# ifdef _was_lib_fork
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# define _lib_fork 1
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# endif
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# ifndef _lib_fork
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pid_t fork(void)
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{
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errormsg(SH_DICT,ERROR_exit(3),e_notimp,"fork");
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return(-1);
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}
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# endif /* _lib_fork */
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#endif /* SHOPT_SPAWN */
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