diff options
Diffstat (limited to 'exec.c')
-rw-r--r-- | exec.c | 1553 |
1 files changed, 1553 insertions, 0 deletions
@@ -0,0 +1,1553 @@ +/* $NetBSD: exec.c,v 1.28 2018/06/03 12:18:29 kamil Exp $ */ + +/* + * execute command tree + */ +#include <sys/cdefs.h> + +#ifndef lint +__RCSID("$NetBSD: exec.c,v 1.28 2018/06/03 12:18:29 kamil Exp $"); +#endif + +#include <sys/stat.h> +#include <ctype.h> +#include <stdbool.h> + +#include "sh.h" +#include "c_test.h" + +/* Does ps4 get parameter substitutions done? */ +#ifdef KSH +# define PS4_SUBSTITUTE(s) substitute((s), 0) +#else +# define PS4_SUBSTITUTE(s) (s) +#endif /* KSH */ + +static int comexec ARGS((struct op *, struct tbl *volatile, char **, + int volatile)); +static void scriptexec ARGS((struct op *, char **)); +static int call_builtin ARGS((struct tbl *, char **)); +static int iosetup ARGS((struct ioword *, struct tbl *)); +static int herein ARGS((const char *, int)); +#ifdef KSH +static char *do_selectargs(char **, bool); +#endif /* KSH */ +#ifdef KSH +static int dbteste_isa ARGS((Test_env *, Test_meta)); +static const char *dbteste_getopnd ARGS((Test_env *, Test_op, int)); +static int dbteste_eval ARGS((Test_env *, Test_op, const char *, + const char *, int)); +static void dbteste_error ARGS((Test_env *, int, const char *)); +#endif /* KSH */ + +/* + * handle systems that don't have F_SETFD + */ +#ifndef F_SETFD +# ifndef MAXFD +# define MAXFD 64 +# endif +/* a bit field would be smaller, but this will work */ +static char clexec_tab[MAXFD+1]; +#endif + +/* + * we now use this function always. + */ +int +fd_clexec(fd) + int fd; +{ +#ifndef F_SETFD + if (fd >= 0 && fd < sizeof(clexec_tab)) { + clexec_tab[fd] = 1; + return 0; + } + return -1; +#else + return fcntl(fd, F_SETFD, 1); +#endif +} + + +/* + * execute command tree + */ +int +execute(t, flags) + struct op * volatile t; + volatile int flags; /* if XEXEC don't fork */ +{ + int i; + volatile int rv = 0; + int pv[2]; + char ** volatile ap; + char *s, *cp; + struct ioword **iowp; + struct tbl *tp = NULL; + + if (t == NULL) + return 0; + + /* Is this the end of a pipeline? If so, we want to evaluate the + * command arguments + bool eval_done = false; + if ((flags&XFORK) && !(flags&XEXEC) && (flags&XPCLOSE)) { + eval_done = true; + tp = eval_execute_args(t, &ap); + } + */ + if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE) + return exchild(t, flags & ~XTIME, -1); /* run in sub-process */ + + newenv(E_EXEC); + if (trap) + runtraps(0); + + if (t->type == TCOM) { + /* Clear subst_exstat before argument expansion. Used by + * null commands (see comexec() and c_eval()) and by c_set(). + */ + subst_exstat = 0; + + current_lineno = t->lineno; /* for $LINENO */ + + /* POSIX says expand command words first, then redirections, + * and assignments last.. + */ + ap = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); + if (flags & XTIME) + /* Allow option parsing (bizarre, but POSIX) */ + timex_hook(t, &ap); + if (Flag(FXTRACE) && ap[0]) { + shf_fprintf(shl_out, "%s", + PS4_SUBSTITUTE(str_val(global("PS4")))); + for (i = 0; ap[i]; i++) + shf_fprintf(shl_out, "%s%s", ap[i], + ap[i + 1] ? space : newline); + shf_flush(shl_out); + } + if (ap[0]) + tp = findcom(ap[0], FC_BI|FC_FUNC); + } + flags &= ~XTIME; + + if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { + e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP); + /* initialize to not redirected */ + memset(e->savefd, 0, sizeofN(short, NUFILE)); + } + + /* do redirection, to be restored in quitenv() */ + if (t->ioact != NULL) + for (iowp = t->ioact; *iowp != NULL; iowp++) { + if (iosetup(*iowp, tp) < 0) { + exstat = rv = 1; + /* Redirection failures for special commands + * cause (non-interactive) shell to exit. + */ + if (tp && tp->type == CSHELL + && (tp->flag & SPEC_BI)) + errorf("%s", null); + /* Deal with FERREXIT, quitenv(), etc. */ + goto Break; + } + } + + switch(t->type) { + case TCOM: + rv = comexec(t, tp, ap, flags); + break; + + case TPAREN: + rv = execute(t->left, flags|XFORK); + break; + + case TPIPE: + flags |= XFORK; + flags &= ~XEXEC; + e->savefd[0] = savefd(0, 0); + (void) ksh_dup2(e->savefd[0], 0, false); /* stdin of first */ + e->savefd[1] = savefd(1, 0); + while (t->type == TPIPE) { + openpipe(pv); + (void) ksh_dup2(pv[1], 1, false); /* stdout of curr */ + /* Let exchild() close pv[0] in child + * (if this isn't done, commands like + * (: ; cat /etc/termcap) | sleep 1 + * will hang forever). + */ + exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]); + (void) ksh_dup2(pv[0], 0, false); /* stdin of next */ + closepipe(pv); + flags |= XPIPEI; + t = t->right; + } + restfd(1, e->savefd[1]); /* stdout of last */ + e->savefd[1] = 0; /* no need to re-restore this */ + /* Let exchild() close 0 in parent, after fork, before wait */ + i = exchild(t, flags|XPCLOSE, 0); + if (!(flags&XBGND) && !(flags&XXCOM)) + rv = i; + break; + + case TLIST: + while (t->type == TLIST) { + execute(t->left, flags & XERROK); + t = t->right; + } + rv = execute(t, flags & XERROK); + break; + +#ifdef KSH + case TCOPROC: + { + sigset_t omask; + + /* Block sigchild as we are using things changed in the + * signal handler + */ + sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); + e->type = E_ERRH; + i = ksh_sigsetjmp(e->jbuf, 0); + if (i) { + sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); + quitenv(); + unwind(i); + /*NOTREACHED*/ + } + + /* Already have a (live) co-process? */ + if (coproc.job && coproc.write >= 0) + errorf("coprocess already exists"); + + /* Can we re-use the existing co-process pipe? */ + coproc_cleanup(true); + + /* do this before opening pipes, in case these fail */ + e->savefd[0] = savefd(0, 0); + e->savefd[1] = savefd(1, 0); + + openpipe(pv); + if (pv[0] != 0) { + ksh_dup2(pv[0], 0, false); + close(pv[0]); + } + coproc.write = pv[1]; + coproc.job = (void *) 0; + + if (coproc.readw >= 0) + ksh_dup2(coproc.readw, 1, false); + else { + openpipe(pv); + coproc.read = pv[0]; + ksh_dup2(pv[1], 1, false); + coproc.readw = pv[1]; /* closed before first read */ + coproc.njobs = 0; + /* create new coprocess id */ + ++coproc.id; + } + + sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); + e->type = E_EXEC; /* no more need for error handler */ + + /* exchild() closes coproc.* in child after fork, + * will also increment coproc.njobs when the + * job is actually created. + */ + flags &= ~XEXEC; + exchild(t->left, flags|XBGND|XFORK|XCOPROC|XCCLOSE, + coproc.readw); + break; + } +#endif /* KSH */ + + case TASYNC: + /* XXX non-optimal, I think - "(foo &)", forks for (), + * forks again for async... parent should optimize + * this to "foo &"... + */ + rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK); + break; + + case TOR: + case TAND: + rv = execute(t->left, XERROK); + if (t->right != NULL && (rv == 0) == (t->type == TAND)) + rv = execute(t->right, flags & XERROK); + else + flags |= XERROK; + break; + + case TBANG: + rv = !execute(t->right, XERROK); + break; + +#ifdef KSH + case TDBRACKET: + { + Test_env te; + + te.flags = TEF_DBRACKET; + te.pos.wp = t->args; + te.isa = dbteste_isa; + te.getopnd = dbteste_getopnd; + te.eval = dbteste_eval; + te.error = dbteste_error; + + rv = test_parse(&te); + break; + } +#endif /* KSH */ + + case TFOR: +#ifdef KSH + case TSELECT: + { + volatile bool is_first = true; +#endif /* KSH */ + ap = (t->vars != NULL) ? + eval(t->vars, DOBLANK|DOGLOB|DOTILDE) + : e->loc->argv + 1; + e->type = E_LOOP; + while (1) { + i = ksh_sigsetjmp(e->jbuf, 0); + if (!i) + break; + if ((e->flags&EF_BRKCONT_PASS) + || (i != LBREAK && i != LCONTIN)) + { + quitenv(); + unwind(i); + } else if (i == LBREAK) { + rv = 0; + goto Break; + } + } + rv = 0; /* in case of a continue */ + if (t->type == TFOR) { + while (*ap != NULL) { + setstr(global(t->str), *ap++, KSH_UNWIND_ERROR); + rv = execute(t->left, flags & XERROK); + } + } +#ifdef KSH + else { /* TSELECT */ + for (;;) { + if (!(cp = do_selectargs(ap, is_first))) { + rv = 1; + break; + } + is_first = false; + setstr(global(t->str), cp, KSH_UNWIND_ERROR); + rv = execute(t->left, flags & XERROK); + } + } + } +#endif /* KSH */ + break; + + case TWHILE: + case TUNTIL: + e->type = E_LOOP; + while (1) { + i = ksh_sigsetjmp(e->jbuf, 0); + if (!i) + break; + if ((e->flags&EF_BRKCONT_PASS) + || (i != LBREAK && i != LCONTIN)) + { + quitenv(); + unwind(i); + } else if (i == LBREAK) { + rv = 0; + goto Break; + } + } + rv = 0; /* in case of a continue */ + while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE)) + rv = execute(t->right, flags & XERROK); + break; + + case TIF: + case TELIF: + if (t->right == NULL) + break; /* should be error */ + rv = execute(t->left, XERROK) == 0 ? + execute(t->right->left, flags & XERROK) : + execute(t->right->right, flags & XERROK); + break; + + case TCASE: + cp = evalstr(t->str, DOTILDE); + for (t = t->left; t != NULL && t->type == TPAT; t = t->right) + for (ap = t->vars; *ap; ap++) + if ((s = evalstr(*ap, DOTILDE|DOPAT)) + && gmatch(cp, s, false)) + goto Found; + break; + Found: + rv = execute(t->left, flags & XERROK); + break; + + case TBRACE: + rv = execute(t->left, flags & XERROK); + break; + + case TFUNCT: + rv = define(t->str, t); + break; + + case TTIME: + /* Clear XEXEC so nested execute() call doesn't exit + * (allows "ls -l | time grep foo"). + */ + rv = timex(t, flags & ~XEXEC); + break; + + case TEXEC: /* an eval'd TCOM */ + s = t->args[0]; + ap = makenv(); +#ifndef F_SETFD + for (i = 0; i < sizeof(clexec_tab); i++) + if (clexec_tab[i]) { + close(i); + clexec_tab[i] = 0; + } +#endif + restoresigs(); + cleanup_proc_env(); + execve(t->str, t->args, ap); + if (errno == ENOEXEC) + scriptexec(t, ap); + else + errorf("%s: %s", s, strerror(errno)); + } + Break: + exstat = rv; + + quitenv(); /* restores IO */ + if ((flags&XEXEC)) + unwind(LEXIT); /* exit child */ + if (rv != 0 && !(flags & XERROK)) { + if (Flag(FERREXIT)) + unwind(LERROR); + trapsig(SIGERR_); + } + return rv; +} + +/* + * execute simple command + */ + +static int +comexec(t, tp, ap, flags) + struct op *t; + struct tbl *volatile tp; + char **ap; + int volatile flags; +{ + int i; + int leave = LLEAVE; + volatile int rv = 0; + char *cp; + char **lastp; + static struct op texec; /* Must be static (XXX but why?) */ + int type_flags; + int keepasn_ok; + int fcflags = FC_BI|FC_FUNC|FC_PATH; + int bourne_function_call = 0; + +#ifdef KSH + /* snag the last argument for $_ XXX not the same as at&t ksh, + * which only seems to set $_ after a newline (but not in + * functions/dot scripts, but in interactive and script) - + * perhaps save last arg here and set it in shell()?. + */ + if (Flag(FTALKING) && *(lastp = ap)) { + while (*++lastp) + ; + /* setstr() can't fail here */ + setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp, + KSH_RETURN_ERROR); + } +#endif /* KSH */ + + /* Deal with the shell builtins builtin, exec and command since + * they can be followed by other commands. This must be done before + * we know if we should create a local block, which must be done + * before we can do a path search (in case the assignments change + * PATH). + * Odd cases: + * FOO=bar exec > /dev/null FOO is kept but not exported + * FOO=bar exec foobar FOO is exported + * FOO=bar command exec > /dev/null FOO is neither kept nor exported + * FOO=bar command FOO is neither kept nor exported + * PATH=... foobar use new PATH in foobar search + */ + keepasn_ok = 1; + while (tp && tp->type == CSHELL) { + fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */ + if (tp->val.f == c_builtin) { + if ((cp = *++ap) == NULL) { + tp = NULL; + break; + } + tp = findcom(cp, FC_BI); + if (tp == NULL) + errorf("builtin: %s: not a builtin", cp); + continue; + } else if (tp->val.f == c_exec) { + if (ap[1] == NULL) + break; + ap++; + flags |= XEXEC; + } else if (tp->val.f == c_command) { + int optc, saw_p = 0; + + /* Ugly dealing with options in two places (here and + * in c_command(), but such is life) + */ + ksh_getopt_reset(&builtin_opt, 0); + while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) + == 'p') + saw_p = 1; + if (optc != EOF) + break; /* command -vV or something */ + /* don't look for functions */ + fcflags = FC_BI|FC_PATH; + if (saw_p) { + if (Flag(FRESTRICTED)) { + warningf(true, + "command -p: restricted"); + rv = 1; + goto Leave; + } + fcflags |= FC_DEFPATH; + } + ap += builtin_opt.optind; + /* POSIX says special builtins lose their status + * if accessed using command. + */ + keepasn_ok = 0; + if (!ap[0]) { + /* ensure command with no args exits with 0 */ + subst_exstat = 0; + break; + } + } else + break; + tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); + } + if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN)))) + type_flags = 0; + else { + /* create new variable/function block */ + newblock(); + /* ksh functions don't keep assignments, POSIX functions do. */ + if (keepasn_ok && tp && tp->type == CFUNC + && !(tp->flag & FKSH)) { + bourne_function_call = 1; + type_flags = 0; + } else + type_flags = LOCAL|LOCAL_COPY|EXPORT; + } + if (Flag(FEXPORT)) + type_flags |= EXPORT; + for (i = 0; t->vars[i]; i++) { + cp = evalstr(t->vars[i], DOASNTILDE); + if (Flag(FXTRACE)) { + if (i == 0) + shf_fprintf(shl_out, "%s", + PS4_SUBSTITUTE(str_val(global("PS4")))); + shf_fprintf(shl_out, "%s%s", cp, + t->vars[i + 1] ? space : newline); + if (!t->vars[i + 1]) + shf_flush(shl_out); + } + typeset(cp, type_flags, 0, 0, 0); + if (bourne_function_call && !(type_flags & EXPORT)) + typeset(cp, LOCAL|LOCAL_COPY|EXPORT, 0, 0, 0); + } + + if ((cp = *ap) == NULL) { + rv = subst_exstat; + goto Leave; + } else if (!tp) { + if (Flag(FRESTRICTED) && ksh_strchr_dirsep(cp)) { + warningf(true, "%s: restricted", cp); + rv = 1; + goto Leave; + } + tp = findcom(cp, fcflags); + } + + switch (tp->type) { + case CSHELL: /* shell built-in */ + rv = call_builtin(tp, ap); + break; + + case CFUNC: /* function call */ + { + volatile int old_xflag; + volatile Tflag old_inuse; + const char *volatile old_kshname; + + if (!(tp->flag & ISSET)) { + struct tbl *ftp; + + if (!tp->u.fpath) { + if (tp->u2.errno_) { + warningf(true, + "%s: can't find function definition file - %s", + cp, strerror(tp->u2.errno_)); + rv = 126; + } else { + warningf(true, + "%s: can't find function definition file", cp); + rv = 127; + } + break; + } + if (include(tp->u.fpath, 0, (char **) 0, 0) < 0) { + warningf(true, + "%s: can't open function definition file %s - %s", + cp, tp->u.fpath, strerror(errno)); + rv = 127; + break; + } + if (!(ftp = findfunc(cp, hash(cp), false)) + || !(ftp->flag & ISSET)) + { + warningf(true, + "%s: function not defined by %s", + cp, tp->u.fpath); + rv = 127; + break; + } + tp = ftp; + } + + /* ksh functions set $0 to function name, POSIX functions leave + * $0 unchanged. + */ + old_kshname = kshname; + if (tp->flag & FKSH) + kshname = ap[0]; + else + ap[0] = (char *) __UNCONST(kshname); + e->loc->argv = ap; + for (i = 0; *ap++ != NULL; i++) + ; + e->loc->argc = i - 1; + /* ksh-style functions handle getopts sanely, + * bourne/posix functions are insane... + */ + if (tp->flag & FKSH) { + e->loc->flags |= BF_DOGETOPTS; + e->loc->getopts_state = user_opt; + getopts_reset(1); + } + + old_xflag = Flag(FXTRACE); + Flag(FXTRACE) = tp->flag & TRACE ? true : false; + + old_inuse = tp->flag & FINUSE; + tp->flag |= FINUSE; + + e->type = E_FUNC; + i = ksh_sigsetjmp(e->jbuf, 0); + if (i == 0) { + /* seems odd to pass XERROK here, but at&t ksh does */ + exstat = execute(tp->val.t, flags & XERROK); + i = LRETURN; + } + kshname = old_kshname; + Flag(FXTRACE) = old_xflag; + tp->flag = (tp->flag & ~FINUSE) | old_inuse; + /* Were we deleted while executing? If so, free the execution + * tree. todo: Unfortunately, the table entry is never re-used + * until the lookup table is expanded. + */ + if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { + if (tp->flag & ALLOC) { + tp->flag &= ~ALLOC; + tfree(tp->val.t, tp->areap); + } + tp->flag = 0; + } + switch (i) { + case LRETURN: + case LERROR: + rv = exstat; + break; + case LINTR: + case LEXIT: + case LLEAVE: + case LSHELL: + quitenv(); + unwind(i); + /*NOTREACHED*/ + default: + quitenv(); + internal_errorf(1, "CFUNC %d", i); + } + break; + } + + case CEXEC: /* executable command */ + case CTALIAS: /* tracked alias */ + if (!(tp->flag&ISSET)) { + /* errno_ will be set if the named command was found + * but could not be executed (permissions, no execute + * bit, directory, etc). Print out a (hopefully) + * useful error message and set the exit status to 126. + */ + if (tp->u2.errno_) { + warningf(true, "%s: cannot execute - %s", cp, + strerror(tp->u2.errno_)); + rv = 126; /* POSIX */ + } else { + warningf(true, "%s: not found", cp); + rv = 127; + } + break; + } + +#ifdef KSH + /* set $_ to program's full path */ + /* setstr() can't fail here */ + setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0), + tp->val.s, KSH_RETURN_ERROR); +#endif /* KSH */ + + if (flags&XEXEC) { + j_exit(); + if (!(flags&XBGND) || Flag(FMONITOR)) { + setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); + setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); + } + } + + /* to fork we set up a TEXEC node and call execute */ + texec.type = TEXEC; + texec.left = t; /* for tprint */ + texec.str = tp->val.s; + texec.args = ap; + rv = exchild(&texec, flags, -1); + break; + } + leave = LEXIT; + Leave: + if (flags & XEXEC) { + exstat = rv; + unwind(leave); + } + return rv; +} + +static void +scriptexec(tp, ap) + struct op *tp; + char **ap; +{ + char *shellv; + + shellv = str_val(global(EXECSHELL_STR)); + if (shellv && *shellv) + shellv = search(shellv, path, X_OK, (int *) 0); + if (!shellv || !*shellv) + shellv = __UNCONST(EXECSHELL); + + *tp->args-- = tp->str; + *tp->args = shellv; + + execve(tp->args[0], tp->args, ap); + + /* report both the program that was run and the bogus shell */ + errorf("%s: %s: %s", tp->str, shellv, strerror(errno)); +} + +int +shcomexec(wp) + char **wp; +{ + struct tbl *tp; + + tp = mytsearch(&builtins, *wp, hash(*wp)); + if (tp == NULL) + internal_errorf(1, "shcomexec: %s", *wp); + return call_builtin(tp, wp); +} + +/* + * Search function tables for a function. If create set, a table entry + * is created if none is found. + */ +struct tbl * +findfunc(name, h, create) + const char *name; + unsigned int h; + int create; +{ + struct block *l; + struct tbl *tp = (struct tbl *) 0; + + for (l = e->loc; l; l = l->next) { + tp = mytsearch(&l->funs, name, h); + if (tp) + break; + if (!l->next && create) { + tp = tenter(&l->funs, name, h); + tp->flag = DEFINED; + tp->type = CFUNC; + tp->val.t = (struct op *) 0; + break; + } + } + return tp; +} + +/* + * define function. Returns 1 if function is being undefined (t == 0) and + * function did not exist, returns 0 otherwise. + */ +int +define(name, t) + const char *name; + struct op *t; +{ + struct tbl *tp; + int was_set = 0; + + while (1) { + tp = findfunc(name, hash(name), true); + + if (tp->flag & ISSET) + was_set = 1; + /* If this function is currently being executed, we zap this + * table entry so findfunc() won't see it + */ + if (tp->flag & FINUSE) { + tp->name[0] = '\0'; + tp->flag &= ~DEFINED; /* ensure it won't be found */ + tp->flag |= FDELETE; + } else + break; + } + + if (tp->flag & ALLOC) { + tp->flag &= ~(ISSET|ALLOC); + tfree(tp->val.t, tp->areap); + } + + if (t == NULL) { /* undefine */ + mytdelete(tp); + return was_set ? 0 : 1; + } + + tp->val.t = tcopy(t->left, tp->areap); + tp->flag |= (ISSET|ALLOC); + if (t->u.ksh_func) + tp->flag |= FKSH; + + return 0; +} + +/* + * add builtin + */ +void +builtin(name, func) + const char *name; + int (*func) ARGS((char **)); +{ + struct tbl *tp; + Tflag flag; + + /* see if any flags should be set for this builtin */ + for (flag = 0; ; name++) { + if (*name == '=') /* command does variable assignment */ + flag |= KEEPASN; + else if (*name == '*') /* POSIX special builtin */ + flag |= SPEC_BI; + else if (*name == '+') /* POSIX regular builtin */ + flag |= REG_BI; + else + break; + } + + tp = tenter(&builtins, name, hash(name)); + tp->flag = DEFINED | flag; + tp->type = CSHELL; + tp->val.f = func; +} + +/* + * find command + * either function, hashed command, or built-in (in that order) + */ +struct tbl * +findcom(name, flags) + const char *name; + int flags; /* FC_* */ +{ + static struct tbl temp; + unsigned int h = hash(name); + struct tbl *tp = NULL, *tbi; + int insert = Flag(FTRACKALL); /* insert if not found */ + char *fpath; /* for function autoloading */ + char *npath; + + if (ksh_strchr_dirsep(name) != NULL) { + insert = 0; + /* prevent FPATH search below */ + flags &= ~FC_FUNC; + goto Search; + } + tbi = (flags & FC_BI) ? mytsearch(&builtins, name, h) : NULL; + /* POSIX says special builtins first, then functions, then + * POSIX regular builtins, then search path... + */ + if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) + tp = tbi; + if (!tp && (flags & FC_FUNC)) { + tp = findfunc(name, h, false); + if (tp && !(tp->flag & ISSET)) { + if ((fpath = str_val(global("FPATH"))) == null) { + tp->u.fpath = (char *) 0; + tp->u2.errno_ = 0; + } else + tp->u.fpath = search(name, fpath, R_OK, + &tp->u2.errno_); + } + } + if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI)) + tp = tbi; + /* todo: posix says non-special/non-regular builtins must + * be triggered by some user-controllable means like a + * special directory in PATH. Requires modifications to + * the search() function. Tracked aliases should be + * modified to allow tracking of builtin commands. + * This should be under control of the FPOSIX flag. + * If this is changed, also change c_whence... + */ + if (!tp && (flags & FC_UNREGBI) && tbi) + tp = tbi; + if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { + tp = mytsearch(&taliases, name, h); + if (tp && (tp->flag & ISSET) && eaccess(tp->val.s, X_OK) != 0) { + if (tp->flag & ALLOC) { + tp->flag &= ~ALLOC; + afree(tp->val.s, APERM); + } + tp->flag &= ~ISSET; + } + } + + Search: + if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) + && (flags & FC_PATH)) + { + if (!tp) { + if (insert && !(flags & FC_DEFPATH)) { + tp = tenter(&taliases, name, h); + tp->type = CTALIAS; + } else { + tp = &temp; + tp->type = CEXEC; + } + tp->flag = DEFINED; /* make ~ISSET */ + } + npath = search(name, flags & FC_DEFPATH ? def_path : path, + X_OK, &tp->u2.errno_); + if (npath) { + if (tp == &temp) { + tp->val.s = npath; + } else { + tp->val.s = str_save(npath, APERM); + afree(npath, ATEMP); + } + tp->flag |= ISSET|ALLOC; + } else if ((flags & FC_FUNC) + && (fpath = str_val(global("FPATH"))) != null + && (npath = search(name, fpath, R_OK, + &tp->u2.errno_)) != (char *) 0) + { + /* An undocumented feature of at&t ksh is that it + * searches FPATH if a command is not found, even + * if the command hasn't been set up as an autoloaded + * function (ie, no typeset -uf). + */ + tp = &temp; + tp->type = CFUNC; + tp->flag = DEFINED; /* make ~ISSET */ + tp->u.fpath = npath; + } + } + return tp; +} + +/* + * flush executable commands with relative paths + */ +void +flushcom(all) + int all; /* just relative or all */ +{ + struct tbl *tp; + struct tstate ts; + + for (ksh_twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; ) + if ((tp->flag&ISSET) && (all || !ISDIRSEP(tp->val.s[0]))) { + if (tp->flag&ALLOC) { + tp->flag &= ~(ALLOC|ISSET); + afree(tp->val.s, APERM); + } + tp->flag &= ~ISSET; + } +} + +/* Check if path is something we want to find. Returns -1 for failure. */ +int +search_access(pathx, mode, errnop) + const char *pathx; + int mode; + int *errnop; /* set if candidate found, but not suitable */ +{ + int ret, err = 0; + struct stat statb; + + if (stat(pathx, &statb) < 0) + return -1; + ret = eaccess(pathx, mode); + if (ret < 0) + err = errno; /* File exists, but we can't access it */ + else if (mode == X_OK + && (!S_ISREG(statb.st_mode) + /* This 'cause access() says root can execute everything */ + || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) + { + ret = -1; + err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; + } + if (err && errnop && !*errnop) + *errnop = err; + return ret; +} + +/* + * search for command with PATH + */ +char * +search(name, pathx, mode, errnop) + const char *name; + const char *pathx; + int mode; /* R_OK or X_OK */ + int *errnop; /* set if candidate found, but not suitable */ +{ + const char *sp, *p; + char *xp; + XString xs; + int namelen; + + if (errnop) + *errnop = 0; + + if (ksh_strchr_dirsep(name)) { + if (search_access(name, mode, errnop) == 0) + return (char *)__UNCONST(name); + return NULL; + } + + namelen = strlen(name) + 1; + Xinit(xs, xp, 128, ATEMP); + + sp = pathx; + while (sp != NULL) { + xp = Xstring(xs, xp); + if (!(p = strchr(sp, PATHSEP))) + p = sp + strlen(sp); + if (p != sp) { + XcheckN(xs, xp, p - sp); + memcpy(xp, sp, p - sp); + xp += p - sp; + *xp++ = DIRSEP; + } + sp = p; + XcheckN(xs, xp, namelen); + memcpy(xp, name, namelen); + if (search_access(Xstring(xs, xp), mode, errnop) == 0) + return Xclose(xs, xp + namelen); + if (*sp++ == '\0') + sp = NULL; + } + Xfree(xs, xp); + return NULL; +} + +static int +call_builtin(tp, wp) + struct tbl *tp; + char **wp; +{ + int rv; + + builtin_argv0 = wp[0]; + builtin_flag = tp->flag; + shf_reopen(1, SHF_WR, shl_stdout); + shl_stdout_ok = 1; + ksh_getopt_reset(&builtin_opt, GF_ERROR); + rv = (*tp->val.f)(wp); + shf_flush(shl_stdout); + shl_stdout_ok = 0; + builtin_flag = 0; + builtin_argv0 = (char *) 0; + return rv; +} + +/* + * set up redirection, saving old fd's in e->savefd + */ +static int +iosetup(iop, tp) + struct ioword *iop; + struct tbl *tp; +{ + int u = -1; + char *cp = iop->name; + int iotype = iop->flag & IOTYPE; + int do_open = 1, do_close = 0, UNINITIALIZED(flags); + struct ioword iotmp; + struct stat statb; + + if (iotype != IOHERE) + cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); + + /* Used for tracing and error messages to print expanded cp */ + iotmp = *iop; + iotmp.name = (iotype == IOHERE) ? (char *) 0 : cp; + iotmp.flag |= IONAMEXP; + + if (Flag(FXTRACE)) + shellf("%s%s\n", + PS4_SUBSTITUTE(str_val(global("PS4"))), + snptreef((char *) 0, 32, "%R", &iotmp)); + + switch (iotype) { + case IOREAD: + flags = O_RDONLY; + break; + + case IOCAT: + flags = O_WRONLY | O_APPEND | O_CREAT; + break; + + case IOWRITE: + flags = O_WRONLY | O_CREAT | O_TRUNC; + /* The stat() is here to allow redirections to + * things like /dev/null without error. + */ + if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) + && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) + flags |= O_EXCL; + break; + + case IORDWR: + flags = O_RDWR | O_CREAT; + break; + + case IOHERE: + do_open = 0; + /* herein() returns -2 if error has been printed */ + u = herein(iop->heredoc, iop->flag & IOEVAL); + /* cp may have wrong name */ + break; + + case IODUP: + { + const char *emsg; + + do_open = 0; + if (*cp == '-' && !cp[1]) { + u = 1009; /* prevent error return below */ + do_close = 1; + } else if ((u = check_fd(cp, + X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), + &emsg)) < 0) + { + warningf(true, "%s: %s", + snptreef((char *) 0, 32, "%R", &iotmp), emsg); + return -1; + } + if (u == iop->unit) + return 0; /* "dup from" == "dup to" */ + break; + } + } + if (do_open) { + if (Flag(FRESTRICTED) && (flags & O_CREAT)) { + warningf(true, "%s: restricted", cp); + return -1; + } + u = open(cp, flags, 0666); + } + if (u < 0) { + /* herein() may already have printed message */ + if (u == -1) + warningf(true, "cannot %s %s: %s", + iotype == IODUP ? "dup" + : (iotype == IOREAD || iotype == IOHERE) ? + "open" : "create", cp, strerror(errno)); + return -1; + } + /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ + if (e->savefd[iop->unit] == 0) { + /* If these are the same, it means unit was previously closed */ + if (u == iop->unit) + e->savefd[iop->unit] = -1; + else + /* c_exec() assumes e->savefd[fd] set for any + * redirections. Ask savefd() not to close iop->unit; + * this allows error messages to be seen if iop->unit + * is 2; also means we can't lose the fd (eg, both + * dup2 below and dup2 in restfd() failing). + */ + e->savefd[iop->unit] = savefd(iop->unit, 1); + } + + if (do_close) + close(iop->unit); + else if (u != iop->unit) { + if (ksh_dup2(u, iop->unit, true) < 0) { + warningf(true, + "could not finish (dup) redirection %s: %s", + snptreef((char *) 0, 32, "%R", &iotmp), + strerror(errno)); + if (iotype != IODUP) + close(u); + return -1; + } + if (iotype != IODUP) + close(u); +#ifdef KSH + /* Touching any co-process fd in an empty exec + * causes the shell to close its copies + */ + else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { + if (iop->flag & IORDUP) /* possible exec <&p */ + coproc_read_close(u); + else /* possible exec >&p */ + coproc_write_close(u); + } +#endif /* KSH */ + } + if (u == 2) /* Clear any write errors */ + shf_reopen(2, SHF_WR, shl_out); + return 0; +} + +/* + * open here document temp file. + * if unquoted here, expand here temp file into second temp file. + */ +static int +herein(content, sub) + const char *content; + int sub; +{ + volatile int fd = -1; + struct source *s, *volatile osource; + struct shf *volatile shf; + struct temp *h; + int i; + + /* ksh -c 'cat << EOF' can cause this... */ + if (content == (char *) 0) { + warningf(true, "here document missing"); + return -2; /* special to iosetup(): don't print error */ + } + + /* Create temp file to hold content (done before newenv so temp + * doesn't get removed too soon). + */ + h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); + if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) { + warningf(true, "can't %s temporary file %s: %s", + !shf ? "create" : "open", + h->name, strerror(errno)); + if (shf) + shf_close(shf); + return -2 /* special to iosetup(): don't print error */; + } + + osource = source; + newenv(E_ERRH); + i = ksh_sigsetjmp(e->jbuf, 0); + if (i) { + source = osource; + quitenv(); + shf_close(shf); /* after quitenv */ + close(fd); + return -2; /* special to iosetup(): don't print error */ + } + if (sub) { + /* Do substitutions on the content of heredoc */ + s = pushs(SSTRING, ATEMP); + s->start = s->str = content; + source = s; + if (yylex(ONEWORD|HEREDOC) != LWORD) + internal_errorf(1, "herein: yylex"); + source = osource; + shf_puts(evalstr(yylval.cp, 0), shf); + } else + shf_puts(content, shf); + + quitenv(); + + if (shf_close(shf) == EOF) { + close(fd); + warningf(true, "error writing %s: %s", h->name, + strerror(errno)); + return -2; /* special to iosetup(): don't print error */ + } + + return fd; +} + +#ifdef KSH +/* + * ksh special - the select command processing section + * print the args in column form - assuming that we can + */ +static char * +do_selectargs(char **ap, bool print_menu) +{ + static const char *const read_args[] = { + "read", "-r", "REPLY", (char *) 0 + }; + char *s; + int i, argct; + + for (argct = 0; ap[argct]; argct++) + ; + while (1) { + /* Menu is printed if + * - this is the first time around the select loop + * - the user enters a blank line + * - the REPLY parameter is empty + */ + if (print_menu || !*str_val(global("REPLY"))) + pr_menu(ap); + shellf("%s", str_val(global("PS3"))); + if (call_builtin(findcom("read", FC_BI), + (char **) __UNCONST(read_args))) + return (char *) 0; + s = str_val(global("REPLY")); + if (*s) { + i = atoi(s); + return (i >= 1 && i <= argct) ? ap[i - 1] : null; + } + print_menu = 1; + } +} + +struct select_menu_info { + char *const *args; + int arg_width; + int num_width; +} info; + +static char *select_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); + +/* format a single select menu item */ +static char * +select_fmt_entry(arg, i, buf, buflen) + void *arg; + int i; + char *buf; + int buflen; +{ + struct select_menu_info *smi = (struct select_menu_info *) arg; + + shf_snprintf(buf, buflen, "%*d) %s", + smi->num_width, i + 1, smi->args[i]); + return buf; +} + +/* + * print a select style menu + */ +int +pr_menu(ap) + char *const *ap; +{ + struct select_menu_info smi; + char *const *pp; + int nwidth, dwidth; + int i, n; + + /* Width/column calculations were done once and saved, but this + * means select can't be used recursively so we re-calculate each + * time (could save in a structure that is returned, but its probably + * not worth the bother). + */ + + /* + * get dimensions of the list + */ + for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { + i = strlen(*pp); + nwidth = (i > nwidth) ? i : nwidth; + } + /* + * we will print an index of the form + * %d) + * in front of each entry + * get the max width of this + */ + for (i = n, dwidth = 1; i >= 10; i /= 10) + dwidth++; + + smi.args = ap; + smi.arg_width = nwidth; + smi.num_width = dwidth; + print_columns(shl_out, n, select_fmt_entry, (void *) &smi, + dwidth + nwidth + 2, 1); + + return n; +} + +/* XXX: horrible kludge to fit within the framework */ + +static char *plain_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); + +static char * +plain_fmt_entry(arg, i, buf, buflen) + void *arg; + int i; + char *buf; + int buflen; +{ + shf_snprintf(buf, buflen, "%s", ((char *const *)arg)[i]); + return buf; +} + +int +pr_list(ap) + char *const *ap; +{ + char *const *pp; + int nwidth; + int i, n; + + for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { + i = strlen(*pp); + nwidth = (i > nwidth) ? i : nwidth; + } + print_columns(shl_out, n, plain_fmt_entry, (void *)__UNCONST(ap), + nwidth + 1, 0); + + return n; +} +#endif /* KSH */ +#ifdef KSH + +/* + * [[ ... ]] evaluation routines + */ + +extern const char *const dbtest_tokens[]; +extern const char db_close[]; + +/* Test if the current token is a whatever. Accepts the current token if + * it is. Returns 0 if it is not, non-zero if it is (in the case of + * TM_UNOP and TM_BINOP, the returned value is a Test_op). + */ +static int +dbteste_isa(te, meta) + Test_env *te; + Test_meta meta; +{ + int ret = 0; + int uqword; + char *p; + + if (!*te->pos.wp) + return meta == TM_END; + + /* unquoted word? */ + for (p = *te->pos.wp; *p == CHAR; p += 2) + ; + uqword = *p == EOS; + + if (meta == TM_UNOP || meta == TM_BINOP) { + if (uqword) { + char buf[8]; /* longer than the longest operator */ + char *q = buf; + for (p = *te->pos.wp; *p == CHAR + && q < &buf[sizeof(buf) - 1]; + p += 2) + *q++ = p[1]; + *q = '\0'; + ret = (int) test_isop(te, meta, buf); + } + } else if (meta == TM_END) + ret = 0; + else + ret = uqword + && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; + + /* Accept the token? */ + if (ret) + te->pos.wp++; + + return ret; +} + +static const char * +dbteste_getopnd(te, op, do_eval) + Test_env *te; + Test_op op; + int do_eval; +{ + char *s = *te->pos.wp; + + if (!s) + return (char *) 0; + + te->pos.wp++; + + if (!do_eval) + return null; + + if (op == TO_STEQL || op == TO_STNEQ) + s = evalstr(s, DOTILDE | DOPAT); + else + s = evalstr(s, DOTILDE); + + return s; +} + +static int +dbteste_eval(te, op, opnd1, opnd2, do_eval) + Test_env *te; + Test_op op; + const char *opnd1; + const char *opnd2; + int do_eval; +{ + return test_eval(te, op, opnd1, opnd2, do_eval); +} + +static void +dbteste_error(te, offset, msg) + Test_env *te; + int offset; + const char *msg; +{ + te->flags |= TEF_ERROR; + internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); +} +#endif /* KSH */ |