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Diffstat (limited to 'bin/1sh/main.c')
| -rw-r--r-- | bin/1sh/main.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/bin/1sh/main.c b/bin/1sh/main.c new file mode 100644 index 00000000..98f7275d --- /dev/null +++ b/bin/1sh/main.c @@ -0,0 +1,352 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. + */ + +#ifndef lint +static char const 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 8.6 (Berkeley) 5/28/95"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: releng/12.1/bin/sh/main.c 336320 2018-07-15 21:55:17Z jilles $"); + +#include <stdio.h> +#include <signal.h> +#include <sys/stat.h> +#include <unistd.h> +#include <fcntl.h> +#include <locale.h> +#include <errno.h> + +#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 "mystring.h" +#include "exec.h" +#include "cd.h" +#include "redir.h" +#include "builtins.h" + +int rootpid; +int rootshell; +struct jmploc main_handler; +int localeisutf8, initial_localeisutf8; + +static void reset(void); +static void cmdloop(int); +static void read_profile(const char *); +static char *find_dot_file(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 stackmark smark, smark2; + volatile int state; + char *shinit; + + (void) setlocale(LC_ALL, ""); + initcharset(); + state = 0; + if (setjmp(main_handler.loc)) { + switch (exception) { + case EXEXEC: + exitstatus = exerrno; + break; + + case EXERROR: + exitstatus = 2; + break; + + default: + break; + } + + if (state == 0 || iflag == 0 || ! rootshell || + exception == EXEXIT) + exitshell(exitstatus); + reset(); + if (exception == EXINT) + out2fmt_flush("\n"); + 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 = &main_handler; +#ifdef DEBUG + opentrace(); + trputs("Shell args: "); trargs(argv); +#endif + rootpid = getpid(); + rootshell = 1; + INTOFF; + initvar(); + setstackmark(&smark); + setstackmark(&smark2); + procargs(argc, argv); + pwd_init(iflag); + INTON; + if (iflag) + chkmail(1); + if (argv[0] && argv[0][0] == '-') { + state = 1; + read_profile("/etc/profile"); +state1: + state = 2; + if (privileged == 0) + read_profile("${HOME-}/.profile"); + else + read_profile("/etc/suid_profile"); + } +state2: + state = 3; + if (!privileged && iflag) { + if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { + state = 3; + read_profile(shinit); + } + } +state3: + state = 4; + popstackmark(&smark2); + if (minusc) { + evalstring(minusc, sflag ? 0 : EV_EXIT); + } +state4: + if (sflag || minusc == NULL) { + cmdloop(1); + } + exitshell(exitstatus); + /*NOTREACHED*/ + return 0; +} + +static void +reset(void) +{ + reseteval(); + resetinput(); +} + +/* + * Read and execute commands. "Top" is nonzero for the top level command + * loop; it turns on prompting if the shell is interactive. + */ + +static 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 (pendingsig) + dotrap(); + inter = 0; + if (iflag && top) { + inter++; + showjobs(1, SHOWJOBS_DEFAULT); + chkmail(0); + flushout(&output); + } + n = parsecmd(inter); + /* showtree(n); DEBUG */ + if (n == NEOF) { + if (!top || numeof >= 50) + break; + if (!stoppedjobs()) { + if (!Iflag) + break; + out2fmt_flush("\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 != 0) { + if (evalskip == SKIPRETURN) + evalskip = 0; + break; + } + } + popstackmark(&smark); +} + + + +/* + * Read /etc/profile or .profile. Return on error. + */ + +static void +read_profile(const char *name) +{ + int fd; + const char *expandedname; + + expandedname = expandstr(name); + if (expandedname == NULL) + return; + INTOFF; + if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC)) >= 0) + setinputfd(fd, 1); + INTON; + if (fd < 0) + return; + cmdloop(0); + popfile(); +} + + + +/* + * Read a file containing shell functions. + */ + +void +readcmdfile(const char *name) +{ + setinputfile(name, 1); + 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 *opt; + 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, &opt, 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); + } + return basename; +} + +int +dotcmd(int argc, char **argv) +{ + char *filename, *fullname; + + if (argc < 2) + error("missing filename"); + + exitstatus = 0; + + /* + * Because we have historically not supported any options, + * only treat "--" specially. + */ + filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1]; + + fullname = find_dot_file(filename); + setinputfile(fullname, 1); + commandname = fullname; + cmdloop(0); + popfile(); + return exitstatus; +} + + +int +exitcmd(int argc, char **argv) +{ + if (stoppedjobs()) + return 0; + if (argc > 1) + exitshell(number(argv[1])); + else + exitshell_savedstatus(); +} |