533 lines
11 KiB
C
533 lines
11 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)miscbltin.c 8.4 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Miscellaneous builtins.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "shell.h"
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#include "options.h"
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#include "var.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "mystring.h"
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#include "syntax.h"
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#include "trap.h"
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#undef eflag
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int readcmd(int, char **);
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int umaskcmd(int, char **);
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int ulimitcmd(int, char **);
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/*
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* The read builtin. The -r option causes backslashes to be treated like
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* ordinary characters.
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*
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* This uses unbuffered input, which may be avoidable in some cases.
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*
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* Note that if IFS=' :' then read x y should work so that:
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* 'a b' x='a', y='b'
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* ' a b ' x='a', y='b'
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* ':b' x='', y='b'
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* ':' x='', y=''
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* '::' x='', y=''
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* ': :' x='', y=''
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* ':::' x='', y='::'
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* ':b c:' x='', y='b c:'
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*/
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int
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readcmd(int argc __unused, char **argv __unused)
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{
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char **ap;
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int backslash;
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char c;
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int rflag;
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char *prompt;
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const char *ifs;
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char *p;
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int startword;
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int status;
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int i;
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int is_ifs;
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int saveall = 0;
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ptrdiff_t lastnonifs, lastnonifsws;
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struct timeval tv;
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char *tvptr;
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fd_set ifds;
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ssize_t nread;
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int sig;
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rflag = 0;
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prompt = NULL;
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tv.tv_sec = -1;
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tv.tv_usec = 0;
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while ((i = nextopt("erp:t:")) != '\0') {
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switch(i) {
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case 'p':
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prompt = shoptarg;
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break;
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case 'e':
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break;
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case 'r':
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rflag = 1;
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break;
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case 't':
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tv.tv_sec = strtol(shoptarg, &tvptr, 0);
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if (tvptr == shoptarg)
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error("timeout value");
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switch(*tvptr) {
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case 0:
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case 's':
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break;
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case 'h':
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tv.tv_sec *= 60;
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/* FALLTHROUGH */
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case 'm':
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tv.tv_sec *= 60;
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break;
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default:
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error("timeout unit");
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}
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break;
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}
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}
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if (prompt && isatty(0)) {
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out2str(prompt);
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flushall();
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}
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if (*(ap = argptr) == NULL)
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error("arg count");
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if ((ifs = bltinlookup("IFS", 1)) == NULL)
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ifs = " \t\n";
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if (tv.tv_sec >= 0) {
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/*
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* Wait for something to become available.
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*/
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FD_ZERO(&ifds);
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FD_SET(0, &ifds);
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status = select(1, &ifds, NULL, NULL, &tv);
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/*
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* If there's nothing ready, return an error.
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*/
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if (status <= 0) {
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sig = pendingsig;
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return (128 + (sig != 0 ? sig : SIGALRM));
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}
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}
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status = 0;
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startword = 2;
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backslash = 0;
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STARTSTACKSTR(p);
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lastnonifs = lastnonifsws = -1;
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for (;;) {
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nread = read(STDIN_FILENO, &c, 1);
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if (nread == -1) {
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if (errno == EINTR) {
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sig = pendingsig;
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if (sig == 0)
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continue;
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status = 128 + sig;
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break;
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}
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warning("read error: %s", strerror(errno));
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status = 2;
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break;
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} else if (nread != 1) {
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status = 1;
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break;
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}
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if (c == '\0')
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continue;
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CHECKSTRSPACE(1, p);
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if (backslash) {
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backslash = 0;
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if (c != '\n') {
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startword = 0;
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lastnonifs = lastnonifsws = p - stackblock();
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USTPUTC(c, p);
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}
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continue;
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}
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if (!rflag && c == '\\') {
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backslash++;
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continue;
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}
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if (c == '\n')
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break;
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if (strchr(ifs, c))
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is_ifs = strchr(" \t\n", c) ? 1 : 2;
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else
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is_ifs = 0;
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if (startword != 0) {
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if (is_ifs == 1) {
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/* Ignore leading IFS whitespace */
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if (saveall)
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USTPUTC(c, p);
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continue;
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}
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if (is_ifs == 2 && startword == 1) {
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/* Only one non-whitespace IFS per word */
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startword = 2;
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if (saveall) {
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lastnonifsws = p - stackblock();
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USTPUTC(c, p);
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}
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continue;
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}
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}
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if (is_ifs == 0) {
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/* append this character to the current variable */
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startword = 0;
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if (saveall)
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/* Not just a spare terminator */
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saveall++;
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lastnonifs = lastnonifsws = p - stackblock();
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USTPUTC(c, p);
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continue;
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}
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/* end of variable... */
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startword = is_ifs;
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if (ap[1] == NULL) {
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/* Last variable needs all IFS chars */
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saveall++;
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if (is_ifs == 2)
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lastnonifsws = p - stackblock();
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USTPUTC(c, p);
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continue;
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}
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STACKSTRNUL(p);
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setvar(*ap, stackblock(), 0);
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ap++;
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STARTSTACKSTR(p);
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lastnonifs = lastnonifsws = -1;
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}
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STACKSTRNUL(p);
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/*
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* Remove trailing IFS chars: always remove whitespace, don't remove
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* non-whitespace unless it was naked
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*/
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if (saveall <= 1)
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lastnonifsws = lastnonifs;
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stackblock()[lastnonifsws + 1] = '\0';
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setvar(*ap, stackblock(), 0);
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/* Set any remaining args to "" */
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while (*++ap != NULL)
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setvar(*ap, "", 0);
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return status;
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}
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int
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umaskcmd(int argc __unused, char **argv __unused)
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{
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char *ap;
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int mask;
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int i;
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int symbolic_mode = 0;
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while ((i = nextopt("S")) != '\0') {
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symbolic_mode = 1;
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}
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INTOFF;
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mask = umask(0);
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umask(mask);
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INTON;
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if ((ap = *argptr) == NULL) {
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if (symbolic_mode) {
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char u[4], g[4], o[4];
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i = 0;
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if ((mask & S_IRUSR) == 0)
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u[i++] = 'r';
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if ((mask & S_IWUSR) == 0)
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u[i++] = 'w';
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if ((mask & S_IXUSR) == 0)
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u[i++] = 'x';
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u[i] = '\0';
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i = 0;
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if ((mask & S_IRGRP) == 0)
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g[i++] = 'r';
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if ((mask & S_IWGRP) == 0)
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g[i++] = 'w';
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if ((mask & S_IXGRP) == 0)
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g[i++] = 'x';
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g[i] = '\0';
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i = 0;
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if ((mask & S_IROTH) == 0)
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o[i++] = 'r';
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if ((mask & S_IWOTH) == 0)
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o[i++] = 'w';
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if ((mask & S_IXOTH) == 0)
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o[i++] = 'x';
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o[i] = '\0';
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out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
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} else {
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out1fmt("%.4o\n", mask);
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}
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} else {
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if (is_digit(*ap)) {
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mask = 0;
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do {
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if (*ap >= '8' || *ap < '0')
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error("Illegal number: %s", *argptr);
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mask = (mask << 3) + (*ap - '0');
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} while (*++ap != '\0');
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umask(mask);
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} else {
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void *set;
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INTOFF;
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if ((set = setmode (ap)) == NULL)
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error("Illegal number: %s", ap);
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mask = getmode (set, ~mask & 0777);
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umask(~mask & 0777);
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free(set);
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INTON;
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}
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}
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return 0;
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}
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/*
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* ulimit builtin
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*
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* This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
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* Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
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* ash by J.T. Conklin.
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*
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* Public domain.
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*/
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struct limits {
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const char *name;
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const char *units;
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int cmd;
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int factor; /* multiply by to get rlim_{cur,max} values */
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char option;
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};
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static const struct limits limits[] = {
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#ifdef RLIMIT_CPU
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{ "cpu time", "seconds", RLIMIT_CPU, 1, 't' },
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#endif
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#ifdef RLIMIT_FSIZE
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{ "file size", "512-blocks", RLIMIT_FSIZE, 512, 'f' },
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#endif
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#ifdef RLIMIT_DATA
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{ "data seg size", "kbytes", RLIMIT_DATA, 1024, 'd' },
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#endif
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#ifdef RLIMIT_STACK
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{ "stack size", "kbytes", RLIMIT_STACK, 1024, 's' },
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#endif
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#ifdef RLIMIT_CORE
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{ "core file size", "512-blocks", RLIMIT_CORE, 512, 'c' },
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#endif
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#ifdef RLIMIT_RSS
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{ "max memory size", "kbytes", RLIMIT_RSS, 1024, 'm' },
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#endif
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#ifdef RLIMIT_MEMLOCK
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{ "locked memory", "kbytes", RLIMIT_MEMLOCK, 1024, 'l' },
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#endif
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#ifdef RLIMIT_NPROC
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{ "max user processes", (char *)0, RLIMIT_NPROC, 1, 'u' },
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#endif
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#ifdef RLIMIT_NOFILE
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{ "open files", (char *)0, RLIMIT_NOFILE, 1, 'n' },
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#endif
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#ifdef RLIMIT_VMEM
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{ "virtual mem size", "kbytes", RLIMIT_VMEM, 1024, 'v' },
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#endif
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#ifdef RLIMIT_SWAP
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{ "swap limit", "kbytes", RLIMIT_SWAP, 1024, 'w' },
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#endif
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#ifdef RLIMIT_SBSIZE
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{ "sbsize", "bytes", RLIMIT_SBSIZE, 1, 'b' },
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#endif
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#ifdef RLIMIT_NPTS
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{ "pseudo-terminals", (char *)0, RLIMIT_NPTS, 1, 'p' },
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#endif
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#ifdef RLIMIT_KQUEUES
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{ "kqueues", (char *)0, RLIMIT_KQUEUES, 1, 'k' },
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#endif
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#ifdef RLIMIT_UMTXP
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{ "umtxp", (char *)0, RLIMIT_UMTXP, 1, 'o' },
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#endif
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{ (char *) 0, (char *)0, 0, 0, '\0' }
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};
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enum limithow { SOFT = 0x1, HARD = 0x2 };
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static void
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printlimit(enum limithow how, const struct rlimit *limit,
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const struct limits *l)
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{
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rlim_t val = 0;
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if (how & SOFT)
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val = limit->rlim_cur;
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else if (how & HARD)
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val = limit->rlim_max;
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if (val == RLIM_INFINITY)
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out1str("unlimited\n");
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else
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{
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val /= l->factor;
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out1fmt("%jd\n", (intmax_t)val);
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}
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}
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int
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ulimitcmd(int argc __unused, char **argv __unused)
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{
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rlim_t val = 0;
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enum limithow how = SOFT | HARD;
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const struct limits *l;
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int set, all = 0;
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int optc, what;
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struct rlimit limit;
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what = 'f';
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while ((optc = nextopt("HSatfdsmcnuvlbpwko")) != '\0')
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switch (optc) {
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case 'H':
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how = HARD;
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break;
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case 'S':
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how = SOFT;
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break;
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case 'a':
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all = 1;
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break;
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default:
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what = optc;
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}
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for (l = limits; l->name && l->option != what; l++)
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;
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if (!l->name)
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error("internal error (%c)", what);
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set = *argptr ? 1 : 0;
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if (set) {
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char *p = *argptr;
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if (all || argptr[1])
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error("too many arguments");
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if (strcmp(p, "unlimited") == 0)
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val = RLIM_INFINITY;
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else {
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char *end;
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uintmax_t uval;
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if (*p < '0' || *p > '9')
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error("bad number");
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errno = 0;
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uval = strtoumax(p, &end, 10);
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if (errno != 0 || *end != '\0')
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error("bad number");
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if (uval > UINTMAX_MAX / l->factor)
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error("bad number");
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uval *= l->factor;
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val = (rlim_t)uval;
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if (val < 0 || (uintmax_t)val != uval ||
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val == RLIM_INFINITY)
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error("bad number");
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}
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}
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if (all) {
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for (l = limits; l->name; l++) {
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char optbuf[40];
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if (getrlimit(l->cmd, &limit) < 0)
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error("can't get limit: %s", strerror(errno));
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if (l->units)
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snprintf(optbuf, sizeof(optbuf),
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"(%s, -%c) ", l->units, l->option);
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else
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snprintf(optbuf, sizeof(optbuf),
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"(-%c) ", l->option);
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out1fmt("%-18s %18s ", l->name, optbuf);
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printlimit(how, &limit, l);
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}
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return 0;
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}
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if (getrlimit(l->cmd, &limit) < 0)
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error("can't get limit: %s", strerror(errno));
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if (set) {
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if (how & SOFT)
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limit.rlim_cur = val;
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if (how & HARD)
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limit.rlim_max = val;
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if (setrlimit(l->cmd, &limit) < 0)
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error("bad limit: %s", strerror(errno));
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} else
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printlimit(how, &limit, l);
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return 0;
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}
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