/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1997-2005 * Herbert Xu . 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 #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 shlvl; #ifdef __GLIBC__ int *dash_errno; #endif #if PROFILE short profile_buf[16384]; extern int etext(); #endif STATIC void read_profile(const char *); STATIC char *find_dot_file(char *); static int cmdloop(int); 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) { char *shinit; volatile int state; struct jmploc jmploc; struct stackmark smark; int login; #ifdef __GLIBC__ dash_errno = __errno_location(); #endif #if PROFILE monitor(4, etext, profile_buf, sizeof profile_buf, 50); #endif state = 0; if (unlikely(setjmp(jmploc.loc))) { int e; int s; reset(); e = exception; s = state; if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) exitshell(); if (e == EXINT #if ATTY && (! attyset() || equal(termval(), "emacs")) #endif ) { out2c('\n'); #ifdef FLUSHERR flushout(out2); #endif } popstackmark(&smark); FORCEINTON; /* enable interrupts */ if (s == 1) goto state1; else if (s == 2) goto state2; else if (s == 3) goto state3; else goto state4; } handler = &jmploc; #ifdef DEBUG opentrace(); trputs("Shell args: "); trargs(argv); #endif rootpid = getpid(); init(); setstackmark(&smark); login = procargs(argc, argv); if (login) { state = 1; read_profile("/etc/profile"); state1: state = 2; read_profile("$HOME/.profile"); } state2: state = 3; if ( #ifndef linux getuid() == geteuid() && getgid() == getegid() && #endif iflag ) { if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { read_profile(shinit); } } popstackmark(&smark); state3: state = 4; if (minusc) evalstring(minusc, sflag ? 0 : EV_EXIT); if (sflag || minusc == NULL) { state4: /* XXX ??? - why isn't this before the "if" statement */ cmdloop(1); } #if PROFILE monitor(0); #endif #if GPROF { extern void _mcleanup(void); _mcleanup(); } #endif exitshell(); /* NOTREACHED */ } /* * Read and execute commands. "Top" is nonzero for the top level command * loop; it turns on prompting if the shell is interactive. */ static int cmdloop(int top) { union node *n; struct stackmark smark; int inter; int status = 0; int numeof = 0; TRACE(("cmdloop(%d) called\n", top)); for (;;) { int skip; setstackmark(&smark); if (jobctl) showjobs(out2, SHOW_CHANGED); inter = 0; if (iflag && top) { inter++; chkmail(); } 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 (nflag == 0) { int i; job_warning = (job_warning == 2) ? 1 : 0; numeof = 0; i = evaltree(n, 0); if (n) status = i; } popstackmark(&smark); skip = evalskip; if (skip) { evalskip &= ~(SKIPFUNC | SKIPFUNCDEF); break; } } return status; } /* * Read /etc/profile or .profile. Return on error. */ STATIC void read_profile(const char *name) { name = expandstr(name); if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0) return; cmdloop(0); popfile(); } /* * Read a file containing shell functions. */ void readcmdfile(char *name) { setinputfile(name, INPUT_PUSH_FILE); 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 */ sh_error("%s: not found", basename); /* NOTREACHED */ } int dotcmd(int argc, char **argv) { int status = 0; nextopt(nullstr); argv = argptr; if (*argv) { char *fullname; fullname = find_dot_file(*argv); setinputfile(fullname, INPUT_PUSH_FILE); commandname = fullname; status = cmdloop(0); popfile(); } return status; } int exitcmd(int argc, char **argv) { if (stoppedjobs()) return 0; if (argc > 1) savestatus = number(argv[1]); exraise(EXEXIT); /* NOTREACHED */ }