/* $NetBSD: main.c,v 1.50 2005/10/10 21:14:42 christos Exp $ */ /*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ The Regents of the University of California. All rights reserved.\n"); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95"; #else __RCSID("$NetBSD: main.c,v 1.50 2005/10/10 21:14:42 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include "shell.h" #include "main.h" #include "mail.h" #include "options.h" #include "output.h" #include "parser.h" #include "nodes.h" #include "expand.h" #include "eval.h" #include "jobs.h" #include "input.h" #include "trap.h" #include "var.h" #include "show.h" #include "memalloc.h" #include "error.h" #include "init.h" #include "mystring.h" #include "exec.h" #include "cd.h" #define PROFILE 0 int rootpid; int rootshell; STATIC union node *curcmd; STATIC union node *prevcmd; #if PROFILE short profile_buf[16384]; extern int etext(); #endif STATIC void read_profile(const char *); STATIC char *find_dot_file(char *); int main(int, char **); /* * Main routine. We initialize things, parse the arguments, execute * profiles if we're a login shell, and then call cmdloop to execute * commands. The setjmp call sets up the location to jump to when an * exception occurs. When an exception occurs the variable "state" * is used to figure out how far we had gotten. */ int main(int argc, char **argv) { struct jmploc jmploc; struct stackmark smark; volatile int state; char *shinit; setlocale(LC_ALL, ""); #if PROFILE monitor(4, etext, profile_buf, sizeof profile_buf, 50); #endif state = 0; if (setjmp(jmploc.loc)) { /* * When a shell procedure is executed, we raise the * exception EXSHELLPROC to clean up before executing * the shell procedure. */ switch (exception) { case EXSHELLPROC: rootpid = getpid(); rootshell = 1; minusc = NULL; state = 3; break; case EXEXEC: exitstatus = exerrno; break; case EXERROR: exitstatus = 2; break; default: break; } if (exception != EXSHELLPROC) { if (state == 0 || iflag == 0 || ! rootshell) exitshell(exitstatus); } reset(); if (exception == EXINT #if ATTY && (! attyset() || equal(termval(), "emacs")) #endif ) { out2c('\n'); flushout(&errout); } popstackmark(&smark); FORCEINTON; /* enable interrupts */ if (state == 1) goto state1; else if (state == 2) goto state2; else if (state == 3) goto state3; else goto state4; } handler = &jmploc; #ifdef DEBUG #if DEBUG == 2 debug = 1; #endif opentrace(); trputs("Shell args: "); trargs(argv); #endif rootpid = getpid(); rootshell = 1; init(); initpwd(); setstackmark(&smark); procargs(argc, argv); if (argv[0] && argv[0][0] == '-') { state = 1; read_profile("/etc/profile"); state1: state = 2; read_profile(".profile"); } state2: state = 3; if (getuid() == geteuid() && getgid() == getegid()) { if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { state = 3; read_profile(shinit); } } state3: state = 4; if (sflag == 0 || minusc) { static int sigs[] = { SIGINT, SIGQUIT, SIGHUP, #ifdef SIGTSTP SIGTSTP, #endif SIGPIPE }; #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0])) int i; for (i = 0; i < SIGSSIZE; i++) setsignal(sigs[i], 0); } if (minusc) evalstring(minusc, 0); if (sflag || minusc == NULL) { state4: /* XXX ??? - why isn't this before the "if" statement */ cmdloop(1); } #if PROFILE monitor(0); #endif exitshell(exitstatus); /* NOTREACHED */ } /* * Read and execute commands. "Top" is nonzero for the top level command * loop; it turns on prompting if the shell is interactive. */ void cmdloop(int top) { union node *n; struct stackmark smark; int inter; int numeof = 0; TRACE(("cmdloop(%d) called\n", top)); setstackmark(&smark); for (;;) { if (pendingsigs) dotrap(); inter = 0; if (iflag == 1 && top) { inter = 1; showjobs(out2, SHOW_CHANGED); chkmail(0); flushout(&errout); } n = parsecmd(inter); /* showtree(n); DEBUG */ if (n == NEOF) { if (!top || numeof >= 50) break; if (!stoppedjobs()) { if (!Iflag) break; out2str("\nUse \"exit\" to leave shell.\n"); } numeof++; } else if (n != NULL && nflag == 0) { job_warning = (job_warning == 2) ? 1 : 0; numeof = 0; evaltree(n, 0); } popstackmark(&smark); setstackmark(&smark); if (evalskip == SKIPFILE) { evalskip = 0; break; } } popstackmark(&smark); } /* * Read /etc/profile or .profile. Return on error. */ STATIC void read_profile(const char *name) { int fd; int xflag_set = 0; int vflag_set = 0; INTOFF; if ((fd = open(name, O_RDONLY)) >= 0) setinputfd(fd, 1); INTON; if (fd < 0) return; /* -q turns off -x and -v just when executing init files */ if (qflag) { if (xflag) xflag = 0, xflag_set = 1; if (vflag) vflag = 0, vflag_set = 1; } cmdloop(0); if (qflag) { if (xflag_set) xflag = 1; if (vflag_set) vflag = 1; } popfile(); } /* * Read a file containing shell functions. */ void readcmdfile(char *name) { int fd; INTOFF; if ((fd = open(name, O_RDONLY)) >= 0) setinputfd(fd, 1); else error("Can't open %s", name); INTON; cmdloop(0); popfile(); } /* * Take commands from a file. To be compatible we should do a path * search for the file, which is necessary to find sub-commands. */ STATIC char * find_dot_file(char *basename) { char *fullname; const char *path = pathval(); struct stat statb; /* don't try this for absolute or relative paths */ if (strchr(basename, '/')) return basename; while ((fullname = padvance(&path, basename)) != NULL) { if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { /* * Don't bother freeing here, since it will * be freed by the caller. */ return fullname; } stunalloc(fullname); } /* not found in the PATH */ error("%s: not found", basename); /* NOTREACHED */ } int dotcmd(int argc, char **argv) { exitstatus = 0; if (argc >= 2) { /* That's what SVR2 does */ char *fullname; struct stackmark smark; setstackmark(&smark); fullname = find_dot_file(argv[1]); setinputfile(fullname, 1); commandname = fullname; cmdloop(0); popfile(); popstackmark(&smark); } return exitstatus; } int exitcmd(int argc, char **argv) { if (stoppedjobs()) return 0; if (argc > 1) exitstatus = number(argv[1]); exitshell(exitstatus); /* NOTREACHED */ }