mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-04 07:31:11 +00:00
ae46d95884
A difference between the old and the new TTY layer is that the new implementation does not perform any post-processing before returning data back to userspace when calling read(). sh(1)'s read turns the TTY into a raw mode before calling select(). This means that the first character will not receive any ICRNL processing. Inherit this flag from the original terminal attributes. Even though this issue is not present on RELENG_*, I'm MFCing it to make sh(1) in jails behave better. PR: bin/129566 MFC after: 2 weeks
460 lines
9.6 KiB
C
460 lines
9.6 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 <ctype.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 <termios.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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#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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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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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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struct timeval tv;
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char *tvptr;
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fd_set ifds;
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struct termios told, tnew;
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int tsaved;
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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 = nullstr;
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if (tv.tv_sec >= 0) {
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/*
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* See if we can disable input processing; this will
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* not give the desired result if we are in a pipeline
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* and someone upstream is still in line-by-line mode.
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*/
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tsaved = 0;
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if (tcgetattr(0, &told) == 0) {
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memcpy(&tnew, &told, sizeof(told));
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cfmakeraw(&tnew);
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tnew.c_iflag |= told.c_iflag & ICRNL;
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tcsetattr(0, TCSANOW, &tnew);
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tsaved = 1;
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}
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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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if (tsaved)
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tcsetattr(0, TCSANOW, &told);
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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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return(1);
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}
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status = 0;
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startword = 1;
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backslash = 0;
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STARTSTACKSTR(p);
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for (;;) {
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if (read(STDIN_FILENO, &c, 1) != 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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if (backslash) {
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backslash = 0;
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if (c != '\n')
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STPUTC(c, p);
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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 (startword && *ifs == ' ' && strchr(ifs, c)) {
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continue;
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}
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startword = 0;
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if (ap[1] != NULL && strchr(ifs, c) != NULL) {
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STACKSTRNUL(p);
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setvar(*ap, stackblock(), 0);
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ap++;
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startword = 1;
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STARTSTACKSTR(p);
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} else {
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STPUTC(c, p);
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}
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}
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STACKSTRNUL(p);
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setvar(*ap, stackblock(), 0);
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while (*++ap != NULL)
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setvar(*ap, nullstr, 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)
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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 (isdigit(*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)) == 0)
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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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{ (char *) 0, (char *)0, 0, 0, '\0' }
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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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int c;
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rlim_t val = 0;
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enum { SOFT = 0x1, HARD = 0x2 }
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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("HSatfdsmcnuvlbp")) != '\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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val = 0;
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while ((c = *p++) >= '0' && c <= '9')
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{
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val = (val * 10) + (long)(c - '0');
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if (val < 0)
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break;
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}
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if (c)
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error("bad number");
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val *= l->factor;
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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 (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 (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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if (val == RLIM_INFINITY)
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out1fmt("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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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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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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out1fmt("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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return 0;
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}
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