bin/sh/miscbltin.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)miscbltin.c      8.4 (Berkeley) 5/4/95
  37  * $FreeBSD: src/bin/sh/miscbltin.c,v 1.35 2006/02/04 14:37:50 schweikh Exp $
  38  * $DragonFly: src/bin/sh/miscbltin.c,v 1.5 2007/01/13 22:39:30 pavalos Exp $
  39  */
  40
  41 /*
  42  * Miscellaneous builtins.
  43  */
  44
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47 #include <sys/time.h>
  48 #include <sys/resource.h>
  49 #include <unistd.h>
  50 #include <ctype.h>
  51 #include <errno.h>
  52 #include <stdint.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <termios.h>
  56
  57 #include "shell.h"
  58 #include "options.h"
  59 #include "var.h"
  60 #include "output.h"
  61 #include "memalloc.h"
  62 #include "error.h"
  63 #include "mystring.h"
  64
  65 int readcmd(int, char **);
  66 int umaskcmd(int, char **);
  67 int ulimitcmd(int, char **);
  68
  69 #undef eflag
  70
  71 /*
  72  * The read builtin.  The -r option causes backslashes to be treated like
  73  * ordinary characters.
  74  *
  75  * This uses unbuffered input, which may be avoidable in some cases.
  76  */
  77
  78 int
  79 readcmd(int argc __unused, char **argv __unused)
  80 {
  81         char **ap;
  82         int backslash;
  83         char c;
  84         int rflag;
  85         const char *prompt;
  86         char *ifs;
  87         char *p;
  88         int startword;
  89         int status;
  90         int i;
  91         struct timeval tv;
  92         char *tvptr;
  93         fd_set ifds;
  94         struct termios told, tnew;
  95         int tsaved;
  96
  97         rflag = 0;
  98         prompt = NULL;
  99         tv.tv_sec = -1;
 100         tv.tv_usec = 0;
 101         while ((i = nextopt("erp:t:")) != '\0') {
 102                 switch(i) {
 103                 case 'p':
 104                         prompt = shoptarg;
 105                         break;
 106                 case 'e':
 107                         break;
 108                 case 'r':
 109                         rflag = 1;
 110                         break;
 111                 case 't':
 112                         tv.tv_sec = strtol(shoptarg, &tvptr, 0);
 113                         if (tvptr == shoptarg)
 114                                 error("timeout value");
 115                         switch(*tvptr) {
 116                         case 0:
 117                         case 's':
 118                                 break;
 119                         case 'h':
 120                                 tv.tv_sec *= 60;
 121                                 /* FALLTHROUGH */
 122                         case 'm':
 123                                 tv.tv_sec *= 60;
 124                                 break;
 125                         default:
 126                                 error("timeout unit");
 127                         }
 128                         break;
 129                 }
 130         }
 131         if (prompt && isatty(0)) {
 132                 out2str(prompt);
 133                 flushall();
 134         }
 135         if (*(ap = argptr) == NULL)
 136                 error("arg count");
 137         if ((ifs = bltinlookup("IFS", 1)) == NULL)
 138                 ifs = nullstr;
 139
 140         if (tv.tv_sec >= 0) {
 141                 /*
 142                  * See if we can disable input processing; this will
 143                  * not give the desired result if we are in a pipeline
 144                  * and someone upstream is still in line-by-line mode.
 145                  */
 146                 tsaved = 0;
 147                 if (tcgetattr(0, &told) == 0) {
 148                         memcpy(&tnew, &told, sizeof(told));
 149                         cfmakeraw(&tnew);
 150                         tcsetattr(0, TCSANOW, &tnew);
 151                         tsaved = 1;
 152                 }
 153                 /*
 154                  * Wait for something to become available.
 155                  */
 156                 FD_ZERO(&ifds);
 157                 FD_SET(0, &ifds);
 158                 status = select(1, &ifds, NULL, NULL, &tv);
 159                 if (tsaved)
 160                         tcsetattr(0, TCSANOW, &told);
 161                 /*
 162                  * If there's nothing ready, return an error.
 163                  */
 164                 if (status <= 0)
 165                         return(1);
 166         }
 167
 168         status = 0;
 169         startword = 1;
 170         backslash = 0;
 171         STARTSTACKSTR(p);
 172         for (;;) {
 173                 if (read(STDIN_FILENO, &c, 1) != 1) {
 174                         status = 1;
 175                         break;
 176                 }
 177                 if (c == '\0')
 178                         continue;
 179                 if (backslash) {
 180                         backslash = 0;
 181                         if (c != '\n')
 182                                 STPUTC(c, p);
 183                         continue;
 184                 }
 185                 if (!rflag && c == '\\') {
 186                         backslash++;
 187                         continue;
 188                 }
 189                 if (c == '\n')
 190                         break;
 191                 if (startword && *ifs == ' ' && strchr(ifs, c)) {
 192                         continue;
 193                 }
 194                 startword = 0;
 195                 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
 196                         STACKSTRNUL(p);
 197                         setvar(*ap, stackblock(), 0);
 198                         ap++;
 199                         startword = 1;
 200                         STARTSTACKSTR(p);
 201                 } else {
 202                         STPUTC(c, p);
 203                 }
 204         }
 205         STACKSTRNUL(p);
 206         setvar(*ap, stackblock(), 0);
 207         while (*++ap != NULL)
 208                 setvar(*ap, nullstr, 0);
 209         return status;
 210 }
 211
 212
 213
 214 int
 215 umaskcmd(int argc __unused, char **argv __unused)
 216 {
 217         char *ap;
 218         int mask;
 219         int i;
 220         int symbolic_mode = 0;
 221
 222         while ((i = nextopt("S")) != '\0') {
 223                 symbolic_mode = 1;
 224         }
 225
 226         INTOFF;
 227         mask = umask(0);
 228         umask(mask);
 229         INTON;
 230
 231         if ((ap = *argptr) == NULL) {
 232                 if (symbolic_mode) {
 233                         char u[4], g[4], o[4];
 234
 235                         i = 0;
 236                         if ((mask & S_IRUSR) == 0)
 237                                 u[i++] = 'r';
 238                         if ((mask & S_IWUSR) == 0)
 239                                 u[i++] = 'w';
 240                         if ((mask & S_IXUSR) == 0)
 241                                 u[i++] = 'x';
 242                         u[i] = '\0';
 243
 244                         i = 0;
 245                         if ((mask & S_IRGRP) == 0)
 246                                 g[i++] = 'r';
 247                         if ((mask & S_IWGRP) == 0)
 248                                 g[i++] = 'w';
 249                         if ((mask & S_IXGRP) == 0)
 250                                 g[i++] = 'x';
 251                         g[i] = '\0';
 252
 253                         i = 0;
 254                         if ((mask & S_IROTH) == 0)
 255                                 o[i++] = 'r';
 256                         if ((mask & S_IWOTH) == 0)
 257                                 o[i++] = 'w';
 258                         if ((mask & S_IXOTH) == 0)
 259                                 o[i++] = 'x';
 260                         o[i] = '\0';
 261
 262                         out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
 263                 } else {
 264                         out1fmt("%.4o\n", mask);
 265                 }
 266         } else {
 267                 if (isdigit(*ap)) {
 268                         mask = 0;
 269                         do {
 270                                 if (*ap >= '8' || *ap < '0')
 271                                         error("Illegal number: %s", *argptr);
 272                                 mask = (mask << 3) + (*ap - '0');
 273                         } while (*++ap != '\0');
 274                         umask(mask);
 275                 } else {
 276                         void *set;
 277                         INTOFF;
 278                         if ((set = setmode (ap)) == 0)
 279                                 error("Illegal number: %s", ap);
 280
 281                         mask = getmode (set, ~mask & 0777);
 282                         umask(~mask & 0777);
 283                         free(set);
 284                         INTON;
 285                 }
 286         }
 287         return 0;
 288 }
 289
 290 /*
 291  * ulimit builtin
 292  *
 293  * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
 294  * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
 295  * ash by J.T. Conklin.
 296  *
 297  * Public domain.
 298  */
 299
 300 struct limits {
 301         const char *name;
 302         const char *units;
 303         int     cmd;
 304         int     factor; /* multiply by to get rlim_{cur,max} values */
 305         char    option;
 306 };
 307
 308 static const struct limits limits[] = {
 309 #ifdef RLIMIT_CPU
 310         { "cpu time",           "seconds",      RLIMIT_CPU,        1, 't' },
 311 #endif
 312 #ifdef RLIMIT_FSIZE
 313         { "file size",          "512-blocks",   RLIMIT_FSIZE,    512, 'f' },
 314 #endif
 315 #ifdef RLIMIT_DATA
 316         { "data seg size",      "kbytes",       RLIMIT_DATA,    1024, 'd' },
 317 #endif
 318 #ifdef RLIMIT_STACK
 319         { "stack size",         "kbytes",       RLIMIT_STACK,   1024, 's' },
 320 #endif
 321 #ifdef  RLIMIT_CORE
 322         { "core file size",     "512-blocks",   RLIMIT_CORE,     512, 'c' },
 323 #endif
 324 #ifdef RLIMIT_RSS
 325         { "max memory size",    "kbytes",       RLIMIT_RSS,     1024, 'm' },
 326 #endif
 327 #ifdef RLIMIT_MEMLOCK
 328         { "locked memory",      "kbytes",       RLIMIT_MEMLOCK, 1024, 'l' },
 329 #endif
 330 #ifdef RLIMIT_NPROC
 331         { "max user processes", NULL,           RLIMIT_NPROC,      1, 'u' },
 332 #endif
 333 #ifdef RLIMIT_NOFILE
 334         { "open files",         NULL,           RLIMIT_NOFILE,     1, 'n' },
 335 #endif
 336 #ifdef RLIMIT_VMEM
 337         { "virtual mem size",   "kbytes",       RLIMIT_VMEM,    1024, 'v' },
 338 #endif
 339 #ifdef RLIMIT_SWAP
 340         { "swap limit",         "kbytes",       RLIMIT_SWAP,    1024, 'w' },
 341 #endif
 342 #ifdef RLIMIT_SBSIZE
 343         { "sbsize",             "bytes",        RLIMIT_SBSIZE,     1, 'b' },
 344 #endif
 345 #ifdef RLIMIT_POSIXLOCK
 346         { "posixlocks",         NULL,           RLIMIT_POSIXLOCK,  1, 'k' },
 347 #endif
 348         { NULL,                 NULL,           0,                 0, '\0' }
 349 };
 350
 351 int
 352 ulimitcmd(int argc __unused, char **argv __unused)
 353 {
 354         int     c;
 355         rlim_t val = 0;
 356         enum { SOFT = 0x1, HARD = 0x2 }
 357                         how = SOFT | HARD;
 358         const struct limits     *l;
 359         int             set, all = 0;
 360         int             optc, what;
 361         struct rlimit   limit;
 362
 363         what = 'f';
 364         while ((optc = nextopt("HSatfdsmcnuvlbk")) != '\0')
 365                 switch (optc) {
 366                 case 'H':
 367                         how = HARD;
 368                         break;
 369                 case 'S':
 370                         how = SOFT;
 371                         break;
 372                 case 'a':
 373                         all = 1;
 374                         break;
 375                 default:
 376                         what = optc;
 377                 }
 378
 379         for (l = limits; l->name && l->option != what; l++)
 380                 ;
 381         if (!l->name)
 382                 error("internal error (%c)", what);
 383
 384         set = *argptr ? 1 : 0;
 385         if (set) {
 386                 char *p = *argptr;
 387
 388                 if (all || argptr[1])
 389                         error("too many arguments");
 390                 if (strcmp(p, "unlimited") == 0)
 391                         val = RLIM_INFINITY;
 392                 else {
 393                         val = 0;
 394
 395                         while ((c = *p++) >= '0' && c <= '9')
 396                         {
 397                                 val = (val * 10) + (long)(c - '0');
 398                                 if (val < 0)
 399                                         break;
 400                         }
 401                         if (c)
 402                                 error("bad number");
 403                         val *= l->factor;
 404                 }
 405         }
 406         if (all) {
 407                 for (l = limits; l->name; l++) {
 408                         char optbuf[40];
 409                         if (getrlimit(l->cmd, &limit) < 0)
 410                                 error("can't get limit: %s", strerror(errno));
 411                         if (how & SOFT)
 412                                 val = limit.rlim_cur;
 413                         else if (how & HARD)
 414                                 val = limit.rlim_max;
 415
 416                         if (l->units)
 417                                 snprintf(optbuf, sizeof(optbuf),
 418                                         "(%s, -%c) ", l->units, l->option);
 419                         else
 420                                 snprintf(optbuf, sizeof(optbuf),
 421                                         "(-%c) ", l->option);
 422                         out1fmt("%-18s %18s ", l->name, optbuf);
 423                         if (val == RLIM_INFINITY)
 424                                 out1fmt("unlimited\n");
 425                         else
 426                         {
 427                                 val /= l->factor;
 428                                 out1fmt("%jd\n", (intmax_t)val);
 429                         }
 430                 }
 431                 return 0;
 432         }
 433
 434         if (getrlimit(l->cmd, &limit) < 0)
 435                 error("can't get limit: %s", strerror(errno));
 436         if (set) {
 437                 if (how & SOFT)
 438                         limit.rlim_cur = val;
 439                 if (how & HARD)
 440                         limit.rlim_max = val;
 441                 if (setrlimit(l->cmd, &limit) < 0)
 442                         error("bad limit: %s", strerror(errno));
 443         } else {
 444                 if (how & SOFT)
 445                         val = limit.rlim_cur;
 446                 else if (how & HARD)
 447                         val = limit.rlim_max;
 448
 449                 if (val == RLIM_INFINITY)
 450                         out1fmt("unlimited\n");
 451                 else
 452                 {
 453                         val /= l->factor;
 454                         out1fmt("%jd\n", (intmax_t)val);
 455                 }
 456         }
 457         return 0;
 458 }