814 lines
18 KiB
C
814 lines
18 KiB
C
/*
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* startup, main loop, enviroments and error handling
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*/
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#define EXTERN /* define EXTERNs in sh.h */
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#include "sh.h"
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#include "ksh_stat.h"
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#include "ksh_time.h"
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extern char **environ;
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/*
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* global data
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*/
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static void reclaim ARGS((void));
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static void remove_temps ARGS((struct temp *tp));
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static int is_restricted ARGS((char *name));
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/*
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* shell initialization
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*/
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static const char initifs [] = "IFS= \t\n"; /* must be R/W */
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static const char initsubs [] =
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"${PS2=> } ${PS3=#? } ${PS4=+ }";
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static const char version_param[] =
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#ifdef KSH
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"KSH_VERSION"
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#else /* KSH */
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"SH_VERSION"
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#endif /* KSH */
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;
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static const char *const initcoms [] = {
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"typeset", "-x", "SHELL", "PATH", "HOME", NULL,
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"typeset", "-r", version_param, NULL,
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"typeset", "-ri", "PPID", NULL,
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"typeset", "-i", "OPTIND=1",
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#ifdef KSH
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"MAILCHECK=600", "RANDOM", "SECONDS=0", "TMOUT=0",
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#endif /* KSH */
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NULL,
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"alias",
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/* Standard ksh aliases */
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"hash=alias -t", /* not "alias -t --": hash -r needs to work */
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"type=whence -v",
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#ifdef JOBS
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"stop=kill -STOP",
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"suspend=kill -STOP $$",
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#endif
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#ifdef KSH
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"autoload=typeset -fu",
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"functions=typeset -f",
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# ifdef HISTORY
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"history=fc -l",
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# endif /* HISTORY */
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"integer=typeset -i",
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"nohup=nohup ",
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"local=typeset",
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"r=fc -e -",
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#endif /* KSH */
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#ifdef KSH
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/* Aliases that are builtin commands in at&t */
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"login=exec login",
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"newgrp=exec newgrp",
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#endif /* KSH */
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NULL,
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/* this is what at&t ksh seems to track, with the addition of emacs */
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"alias", "-tU",
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"cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
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"mail", "make", "mv", "pr", "rm", "sed", "sh", "vi", "who",
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NULL,
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#ifdef EXTRA_INITCOMS
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EXTRA_INITCOMS, NULL,
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#endif /* EXTRA_INITCOMS */
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NULL
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};
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int
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main(argc, argv)
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int argc;
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register char **argv;
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{
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register int i;
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int argi;
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Source *s;
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struct block *l;
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int restricted;
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char **wp;
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struct env env;
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int euid;
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#ifdef MEM_DEBUG
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chmem_push("+c", 1);
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/*chmem_push("+cd", 1);*/
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#endif
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#ifdef OS2
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setmode (0, O_BINARY);
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setmode (1, O_TEXT);
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#endif
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/* make sure argv[] is sane */
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if (!*argv) {
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static const char *empty_argv[] = {
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"pdksh", (char *) 0
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};
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argv = (char **) empty_argv;
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argc = 1;
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}
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kshname = *argv;
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ainit(&aperm); /* initialize permanent Area */
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/* set up base enviroment */
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memset(&env, 0, sizeof(env));
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env.type = E_NONE;
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ainit(&env.area);
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e = &env;
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newblock(); /* set up global l->vars and l->funs */
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/* Do this first so output routines (eg, errorf, shellf) can work */
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initio();
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initvar();
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initctypes();
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inittraps();
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#ifdef KSH
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coproc_init();
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#endif /* KSH */
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/* set up variable and command dictionaries */
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tinit(&taliases, APERM, 0);
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tinit(&aliases, APERM, 0);
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tinit(&homedirs, APERM, 0);
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/* define shell keywords */
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initkeywords();
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/* define built-in commands */
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tinit(&builtins, APERM, 64); /* must be 2^n (currently 40 builtins) */
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for (i = 0; shbuiltins[i].name != NULL; i++)
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builtin(shbuiltins[i].name, shbuiltins[i].func);
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for (i = 0; kshbuiltins[i].name != NULL; i++)
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builtin(kshbuiltins[i].name, kshbuiltins[i].func);
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init_histvec();
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def_path = DEFAULT__PATH;
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#if defined(HAVE_CONFSTR) && defined(_CS_PATH)
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{
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size_t len = confstr(_CS_PATH, (char *) 0, 0);
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char *new;
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if (len > 0) {
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confstr(_CS_PATH, new = alloc(len + 1, APERM), len + 1);
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def_path = new;
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}
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}
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#endif /* HAVE_CONFSTR && _CS_PATH */
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path = def_path;
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/* Turn on nohup by default for how - will change to off
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* by default once people are aware of its existance
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* (at&t ksh does not have a nohup option - it always sends
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* the hup).
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*/
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Flag(FNOHUP) = 1;
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/* Turn on brace expansion by default. At&t ksh's that have
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* alternation always have it on. BUT, posix doesn't have
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* brace expansion, so set this before setting up FPOSIX
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* (change_flag() clears FBRACEEXPAND when FPOSIX is set).
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*/
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#ifdef BRACE_EXPAND
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Flag(FBRACEEXPAND) = 1;
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#endif /* BRACE_EXPAND */
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/* set posix flag just before environment so that it will have
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* exactly the same effect as the POSIXLY_CORRECT environment
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* variable. If this needs to be done sooner to ensure correct posix
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* operation, an initial scan of the environment will also have
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* done sooner.
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*/
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#ifdef POSIXLY_CORRECT
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change_flag(FPOSIX, OF_SPECIAL, 1);
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#endif /* POSIXLY_CORRECT */
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/* import enviroment */
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if (environ != NULL)
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for (wp = environ; *wp != NULL; wp++)
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typeset(*wp, IMPORT|EXPORT, 0, 0, 0);
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kshpid = procpid = getpid();
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typeset(initifs, 0, 0, 0, 0); /* for security */
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/* assign default shell variable values */
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substitute(initsubs, 0);
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/* Figure out the current working directory and set $PWD */
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{
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struct stat s_pwd, s_dot;
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struct tbl *pwd_v = global("PWD");
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char *pwd = str_val(pwd_v);
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char *pwdx = pwd;
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/* Try to use existing $PWD if it is valid */
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if (!ISABSPATH(pwd)
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|| stat(pwd, &s_pwd) < 0 || stat(".", &s_dot) < 0
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|| s_pwd.st_dev != s_dot.st_dev
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|| s_pwd.st_ino != s_dot.st_ino)
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pwdx = (char *) 0;
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set_current_wd(pwdx);
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if (current_wd[0])
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simplify_path(current_wd);
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/* Only set pwd if we know where we are or if it had a
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* bogus value
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*/
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if (current_wd[0] || pwd != null)
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setstr(pwd_v, current_wd);
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}
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setint(global("PPID"), (long) getppid());
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#ifdef KSH
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setint(global("RANDOM"), (long) time((time_t *)0));
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#endif /* KSH */
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setstr(global(version_param), ksh_version);
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/* execute initialization statements */
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for (wp = (char**) initcoms; *wp != NULL; wp++) {
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shcomexec(wp);
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for (; *wp != NULL; wp++)
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;
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}
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euid = geteuid();
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safe_prompt = euid ? "$ " : "# ";
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{
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struct tbl *vp = global("PS1");
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/* Set PS1 if it isn't set, or we are root and prompt doesn't
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* contain a #.
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*/
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if (!(vp->flag & ISSET) || (!euid && !strchr(str_val(vp), '#')))
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setstr(vp, safe_prompt);
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}
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/* Set this before parsing arguments */
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Flag(FPRIVILEGED) = getuid() != euid || getgid() != getegid();
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/* this to note if monitor is set on command line (see below) */
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Flag(FMONITOR) = 127;
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argi = parse_args(argv, OF_CMDLINE, (int *) 0);
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if (argi < 0)
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exit(1);
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if (Flag(FCOMMAND)) {
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s = pushs(SSTRING, ATEMP);
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if (!(s->start = s->str = argv[argi++]))
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errorf("-c requires an argument");
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if (argv[argi])
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kshname = argv[argi++];
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} else if (argi < argc && !Flag(FSTDIN)) {
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s = pushs(SFILE, ATEMP);
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#ifdef OS2
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/* a bug in os2 extproc shell processing doesn't
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* pass full pathnames so we have to search for it.
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* This changes the behavior of 'ksh arg' to search
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* the users search path but it can't be helped.
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*/
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s->file = search(argv[argi++], path, R_OK, (int *) 0);
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if (!s->file || !*s->file)
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s->file = argv[argi - 1];
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#else
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s->file = argv[argi++];
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#endif /* OS2 */
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s->u.shf = shf_open(s->file, O_RDONLY, 0, SHF_MAPHI|SHF_CLEXEC);
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if (s->u.shf == NULL) {
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exstat = 127; /* POSIX */
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errorf("%s: %s", s->file, strerror(errno));
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}
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kshname = s->file;
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} else {
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Flag(FSTDIN) = 1;
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s = pushs(SSTDIN, ATEMP);
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s->file = "<stdin>";
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s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
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(struct shf *) 0);
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if (isatty(0) && isatty(2)) {
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Flag(FTALKING) = 1;
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/* The following only if isatty(0) */
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s->flags |= SF_TTY;
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s->u.shf->flags |= SHF_INTERRUPT;
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s->file = (char *) 0;
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}
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}
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/* This bizarreness is mandated by POSIX */
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{
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struct stat s_stdin;
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if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode))
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reset_nonblock(0);
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}
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/* initialize job control */
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i = Flag(FMONITOR) != 127;
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Flag(FMONITOR) = 0;
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j_init(i);
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#ifdef EDIT
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/* Do this after j_init(), as tty_fd is not initialized 'til then */
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if (Flag(FTALKING))
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x_init();
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#endif
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l = e->loc;
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l->argv = &argv[argi - 1];
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l->argc = argc - argi;
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l->argv[0] = (char *) kshname;
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getopts_reset(1);
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/* Disable during .profile/ENV reading */
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restricted = Flag(FRESTRICTED);
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Flag(FRESTRICTED) = 0;
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/* Do this before profile/$ENV so that if it causes problems in them,
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* user will know why things broke.
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*/
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if (!current_wd[0] && Flag(FTALKING))
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warningf(FALSE, "Cannot determine current working directory");
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if (Flag(FLOGIN)) {
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#ifdef OS2
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char *profile;
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/* Try to find a profile - first see if $INIT has a value,
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* then try /etc/profile.ksh, then c:/usr/etc/profile.ksh.
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*/
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if (!Flag(FPRIVILEGED)
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&& strcmp(profile = substitute("$INIT/profile.ksh", 0),
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"/profile.ksh"))
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include(profile, 0, (char **) 0, 1);
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else if (include("/etc/profile.ksh", 0, (char **) 0, 1) < 0)
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include("c:/usr/etc/profile.ksh", 0, (char **) 0, 1);
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if (!Flag(FPRIVILEGED))
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include(substitute("$HOME/profile.ksh", 0), 0,
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(char **) 0, 1);
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#else /* OS2 */
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include(KSH_SYSTEM_PROFILE, 0, (char **) 0, 1);
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if (!Flag(FPRIVILEGED))
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include(substitute("$HOME/.profile", 0), 0,
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(char **) 0, 1);
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#endif /* OS2 */
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}
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if (Flag(FPRIVILEGED))
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include("/etc/suid_profile", 0, (char **) 0, 1);
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else {
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char *env_file;
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#ifndef KSH
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if (!Flag(FPOSIX))
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env_file = null;
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else
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#endif /* !KSH */
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/* include $ENV */
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env_file = str_val(global("ENV"));
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#ifdef DEFAULT_ENV
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/* If env isn't set, include default environment */
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if (env_file == null)
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env_file = DEFAULT_ENV;
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#endif /* DEFAULT_ENV */
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env_file = substitute(env_file, DOTILDE);
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if (*env_file != '\0')
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include(env_file, 0, (char **) 0, 1);
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#ifdef OS2
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else if (Flag(FTALKING))
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include(substitute("$HOME/kshrc.ksh", 0), 0,
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(char **) 0, 1);
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#endif /* OS2 */
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}
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if (is_restricted(argv[0]) || is_restricted(str_val(global("SHELL"))))
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restricted = 1;
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if (restricted) {
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static const char *const restr_com[] = {
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"typeset", "-r", "PATH",
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"ENV", "SHELL",
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(char *) 0
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};
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shcomexec((char **) restr_com);
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/* After typeset command... */
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Flag(FRESTRICTED) = 1;
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}
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if (Flag(FTALKING)) {
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hist_init(s);
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#ifdef KSH
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alarm_init();
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#endif /* KSH */
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} else
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Flag(FTRACKALL) = 1; /* set after ENV */
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shell(s, TRUE); /* doesn't return */
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return 0;
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}
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int
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include(name, argc, argv, intr_ok)
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const char *name;
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int argc;
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char **argv;
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int intr_ok;
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{
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register Source *volatile s = NULL;
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Source *volatile sold;
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struct shf *shf;
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char **volatile old_argv;
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volatile int old_argc;
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int i;
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shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI|SHF_CLEXEC);
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if (shf == NULL)
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return -1;
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if (argv) {
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old_argv = e->loc->argv;
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old_argc = e->loc->argc;
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} else {
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old_argv = (char **) 0;
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old_argc = 0;
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}
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sold = source;
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newenv(E_INCL);
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i = ksh_sigsetjmp(e->jbuf, 0);
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if (i) {
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quitenv();
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source = sold;
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if (s)
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shf_close(s->u.shf);
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if (old_argv) {
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e->loc->argv = old_argv;
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e->loc->argc = old_argc;
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}
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switch (i) {
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case LRETURN:
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case LERROR:
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return exstat & 0xff; /* see below */
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case LINTR:
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/* intr_ok is set if we are including .profile or $ENV.
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* If user ^C's out, we don't want to kill the shell...
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*/
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if (intr_ok && (exstat - 128) != SIGTERM)
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return 1;
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/* fall through... */
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case LEXIT:
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case LLEAVE:
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case LSHELL:
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unwind(i);
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/*NOREACHED*/
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default:
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internal_errorf(1, "include: %d", i);
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/*NOREACHED*/
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}
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}
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if (argv) {
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e->loc->argv = argv;
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e->loc->argc = argc;
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}
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s = pushs(SFILE, ATEMP);
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s->u.shf = shf;
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s->file = str_save(name, ATEMP);
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i = shell(s, FALSE);
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quitenv();
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source = sold;
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shf_close(s->u.shf);
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if (old_argv) {
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e->loc->argv = old_argv;
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e->loc->argc = old_argc;
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}
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return i & 0xff; /* & 0xff to ensure value not -1 */
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}
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int
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command(comm)
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const char *comm;
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{
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register Source *s;
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s = pushs(SSTRING, ATEMP);
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s->start = s->str = comm;
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return shell(s, FALSE);
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}
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/*
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* run the commands from the input source, returning status.
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*/
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int
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shell(s, toplevel)
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Source *volatile s; /* input source */
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int volatile toplevel;
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{
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struct op *t;
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volatile int wastty = s->flags & SF_TTY;
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volatile int attempts = 13;
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volatile int interactive = Flag(FTALKING) && toplevel;
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int i;
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newenv(E_PARSE);
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if (interactive)
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really_exit = 0;
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i = ksh_sigsetjmp(e->jbuf, 0);
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if (i) {
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s->start = s->str = null;
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switch (i) {
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case LINTR: /* we get here if SIGINT not caught or ignored */
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case LERROR:
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case LSHELL:
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if (interactive) {
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if (i == LINTR)
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shellf(newline);
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|
/* Reset any eof that was read as part of a
|
|
* multiline command.
|
|
*/
|
|
if (Flag(FIGNOREEOF) && s->type == SEOF
|
|
&& wastty)
|
|
s->type = SSTDIN;
|
|
/* Used by exit command to get back to
|
|
* top level shell. Kind of strange since
|
|
* interactive is set if we are reading from
|
|
* a tty, but to have stopped jobs, one only
|
|
* needs FMONITOR set (not FTALKING/SF_TTY)...
|
|
*/
|
|
break;
|
|
}
|
|
/* fall through... */
|
|
case LEXIT:
|
|
case LLEAVE:
|
|
case LRETURN:
|
|
quitenv();
|
|
unwind(i); /* keep on going */
|
|
/*NOREACHED*/
|
|
default:
|
|
quitenv();
|
|
internal_errorf(1, "shell: %d", i);
|
|
/*NOREACHED*/
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
if (trap)
|
|
runtraps(0);
|
|
|
|
if (s->next == NULL)
|
|
if (Flag(FVERBOSE))
|
|
s->flags |= SF_ECHO;
|
|
else
|
|
s->flags &= ~SF_ECHO;
|
|
|
|
if (interactive) {
|
|
j_notify();
|
|
#ifdef KSH
|
|
mcheck();
|
|
#endif /* KSH */
|
|
set_prompt(PS1, s);
|
|
}
|
|
|
|
t = compile(s);
|
|
if (t != NULL && t->type == TEOF) {
|
|
if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
|
|
shellf("Use `exit' to leave ksh\n");
|
|
s->type = SSTDIN;
|
|
} else if (wastty && !really_exit
|
|
&& j_stopped_running())
|
|
{
|
|
really_exit = 1;
|
|
s->type = SSTDIN;
|
|
} else {
|
|
/* this for POSIX, which says EXIT traps
|
|
* shall be taken in the environment
|
|
* immediately after the last command
|
|
* executed.
|
|
*/
|
|
if (toplevel)
|
|
unwind(LEXIT);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (t && (!Flag(FNOEXEC) || (s->flags & SF_TTY)))
|
|
exstat = execute(t, 0);
|
|
|
|
if (t != NULL && t->type != TEOF && interactive && really_exit)
|
|
really_exit = 0;
|
|
|
|
reclaim();
|
|
}
|
|
quitenv();
|
|
return exstat;
|
|
}
|
|
|
|
/* return to closest error handler or shell(), exit if none found */
|
|
void
|
|
unwind(i)
|
|
int i;
|
|
{
|
|
/* ordering for EXIT vs ERR is a bit odd (this is what at&t ksh does) */
|
|
if (i == LEXIT || (Flag(FERREXIT) && (i == LERROR || i == LINTR)
|
|
&& sigtraps[SIGEXIT_].trap))
|
|
{
|
|
runtrap(&sigtraps[SIGEXIT_]);
|
|
i = LLEAVE;
|
|
} else if (Flag(FERREXIT) && (i == LERROR || i == LINTR)) {
|
|
runtrap(&sigtraps[SIGERR_]);
|
|
i = LLEAVE;
|
|
}
|
|
while (1) {
|
|
switch (e->type) {
|
|
case E_PARSE:
|
|
case E_FUNC:
|
|
case E_INCL:
|
|
case E_LOOP:
|
|
case E_ERRH:
|
|
ksh_siglongjmp(e->jbuf, i);
|
|
/*NOTREACHED*/
|
|
|
|
case E_NONE: /* bottom of the stack */
|
|
{
|
|
if (Flag(FTALKING))
|
|
hist_finish();
|
|
j_exit();
|
|
remove_temps(func_heredocs);
|
|
if (i == LINTR) {
|
|
int sig = exstat - 128;
|
|
|
|
/* ham up our death a bit (at&t ksh
|
|
* only seems to do this for SIGTERM)
|
|
* Don't do it for SIGQUIT, since we'd
|
|
* dump a core..
|
|
*/
|
|
if (sig == SIGINT || sig == SIGTERM) {
|
|
setsig(&sigtraps[sig], SIG_DFL,
|
|
SS_RESTORE_CURR|SS_FORCE);
|
|
kill(0, sig);
|
|
}
|
|
}
|
|
exit(exstat);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
default:
|
|
quitenv();
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
newenv(type)
|
|
int type;
|
|
{
|
|
register struct env *ep;
|
|
|
|
ep = (struct env *) alloc(sizeof(*ep), ATEMP);
|
|
ep->type = type;
|
|
ep->flags = 0;
|
|
ainit(&ep->area);
|
|
ep->loc = e->loc;
|
|
ep->savefd = NULL;
|
|
ep->oenv = e;
|
|
ep->temps = NULL;
|
|
e = ep;
|
|
}
|
|
|
|
void
|
|
quitenv()
|
|
{
|
|
register struct env *ep = e;
|
|
register int fd;
|
|
|
|
if (ep->oenv == NULL) /* cleanup_parents_env() was called */
|
|
exit(exstat); /* exit child */
|
|
if (ep->oenv->loc != ep->loc)
|
|
popblock();
|
|
if (ep->savefd != NULL) {
|
|
for (fd = 0; fd < NUFILE; fd++)
|
|
/* if ep->savefd[fd] < 0, means fd was closed */
|
|
if (ep->savefd[fd])
|
|
restfd(fd, ep->savefd[fd]);
|
|
if (ep->savefd[2]) /* Clear any write errors */
|
|
shf_reopen(2, SHF_WR, shl_out);
|
|
}
|
|
reclaim();
|
|
e = e->oenv;
|
|
afree(ep, ATEMP);
|
|
}
|
|
|
|
/* Called after a fork to cleanup stuff left over from parents environment */
|
|
void
|
|
cleanup_parents_env()
|
|
{
|
|
struct env *ep;
|
|
int fd;
|
|
|
|
/* Don't clean up temporary files - parent will probably need them.
|
|
* Also, can't easily reclaim memory since variables, etc. could be
|
|
* anywyere.
|
|
*/
|
|
|
|
/* close all file descriptors hiding in savefd */
|
|
for (ep = e; ep; ep = ep->oenv) {
|
|
if (ep->savefd)
|
|
for (fd = 0; fd < NUFILE; fd++)
|
|
if (ep->savefd[fd] > 0)
|
|
close(ep->savefd[fd]);
|
|
}
|
|
e->oenv = (struct env *) 0;
|
|
}
|
|
|
|
/* Called just before an execve cleanup stuff temporary files */
|
|
void
|
|
cleanup_proc_env()
|
|
{
|
|
struct env *ep;
|
|
|
|
for (ep = e; ep; ep = ep->oenv)
|
|
remove_temps(ep->temps);
|
|
remove_temps(func_heredocs);
|
|
}
|
|
|
|
/* remove temp files and free ATEMP Area */
|
|
static void
|
|
reclaim()
|
|
{
|
|
remove_temps(e->temps);
|
|
e->temps = NULL;
|
|
afreeall(&e->area);
|
|
}
|
|
|
|
static void
|
|
remove_temps(tp)
|
|
struct temp *tp;
|
|
{
|
|
#ifdef OS2
|
|
static struct temp *delayed_remove;
|
|
struct temp *t, **tprev;
|
|
|
|
if (delayed_remove) {
|
|
for (tprev = &delayed_remove, t = delayed_remove; t; t = *tprev)
|
|
/* No need to check t->pid here... */
|
|
if (unlink(t->name) >= 0 || errno == ENOENT) {
|
|
*tprev = t->next;
|
|
afree(t, APERM);
|
|
} else
|
|
tprev = &t->next;
|
|
}
|
|
#endif /* OS2 */
|
|
|
|
for (; tp != NULL; tp = tp->next)
|
|
if (tp->pid == procpid) {
|
|
#ifdef OS2
|
|
/* OS/2 (and dos) do not allow files that are currently
|
|
* open to be removed, so we cache it away for future
|
|
* removal.
|
|
* XXX should only do this if errno
|
|
* is Efile-still-open-can't-remove
|
|
* (but I don't know what that is...)
|
|
*/
|
|
if (unlink(tp->name) < 0 && errno != ENOENT) {
|
|
t = (struct temp *) alloc(
|
|
sizeof(struct temp) + strlen(tp->name) + 1,
|
|
APERM);
|
|
memset(t, 0, sizeof(struct temp));
|
|
strcpy(t->name, tp->name);
|
|
t->next = delayed_remove;
|
|
delayed_remove = t;
|
|
}
|
|
#else /* OS2 */
|
|
unlink(tp->name);
|
|
#endif /* OS2 */
|
|
}
|
|
}
|
|
|
|
/* Returns true if name refers to a restricted shell */
|
|
static int
|
|
is_restricted(name)
|
|
char *name;
|
|
{
|
|
char *p;
|
|
|
|
if ((p = ksh_strrchr_dirsep(name)))
|
|
name = p;
|
|
/* accepts rsh, rksh, rpdksh, pdrksh, etc. */
|
|
return (p = strchr(name, 'r')) && strstr(p, "sh");
|
|
}
|
|
|
|
void
|
|
aerror(ap, msg)
|
|
Area *ap;
|
|
const char *msg;
|
|
{
|
|
internal_errorf(1, "alloc: %s", msg);
|
|
errorf(null); /* this is never executed - keeps gcc quiet */
|
|
/*NOTREACHED*/
|
|
}
|