463 lines
9.8 KiB
C
463 lines
9.8 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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static const char rcsid[] =
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"$Id: miscbltin.c,v 1.17 1998/08/25 09:33:34 cracauer Exp $";
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#endif /* not lint */
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/*
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* Miscelaneous 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 <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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extern char **argptr; /* argument list for builtin command */
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/*
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* The read builtin. The -e option causes backslashes to escape the
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* following character.
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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(argc, argv)
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int argc __unused;
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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 eflag;
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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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eflag = 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("ep:t:")) != '\0') {
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switch(i) {
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case 'p':
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prompt = optarg;
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break;
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case 'e':
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eflag = 1;
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break;
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case 't':
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tv.tv_sec = strtol(optarg, &tvptr, 0);
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if (tvptr == optarg)
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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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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(0, &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 (eflag && 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 (backslash && c == '\\') {
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if (read(0, &c, 1) != 1) {
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status = 1;
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break;
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}
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STPUTC(c, p);
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} else 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(argc, argv)
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int argc __unused;
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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", argv[1]);
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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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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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}
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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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{ (char *) 0, (char *)0, 0, 0, '\0' }
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};
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int
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ulimitcmd(argc, argv)
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int argc __unused;
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char **argv __unused;
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{
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int c;
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quad_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("HSatfdsmcnul")) != '\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("ulimit: 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("ulimit: 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 = (quad_t) 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 < (quad_t) 0)
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break;
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}
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if (c)
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error("ulimit: 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("ulimit: 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("%qd\n", (quad_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("ulimit: 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("ulimit: 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("%qd\n", (quad_t) val);
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}
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}
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return 0;
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}
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