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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)miscbltin.c 8.4 (Berkeley) 5/4/95";
  36 #endif
  37 #endif /* not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  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 <errno.h>
  51 #include <stdint.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54
  55 #include "shell.h"
  56 #include "options.h"
  57 #include "var.h"
  58 #include "output.h"
  59 #include "memalloc.h"
  60 #include "error.h"
  61 #include "mystring.h"
  62 #include "syntax.h"
  63 #include "trap.h"
  64
  65 #undef eflag
  66
  67 int readcmd(int, char **);
  68 int umaskcmd(int, char **);
  69 int ulimitcmd(int, char **);
  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  * Note that if IFS=' :' then read x y should work so that:
  78  * 'a b'        x='a', y='b'
  79  * ' a b '      x='a', y='b'
  80  * ':b'         x='',  y='b'
  81  * ':'          x='',  y=''
  82  * '::'         x='',  y=''
  83  * ': :'        x='',  y=''
  84  * ':::'        x='',  y='::'
  85  * ':b c:'      x='',  y='b c:'
  86  */
  87
  88 int
  89 readcmd(int argc __unused, char **argv __unused)
  90 {
  91         char **ap;
  92         int backslash;
  93         char c;
  94         int rflag;
  95         char *prompt;
  96         const char *ifs;
  97         char *p;
  98         int startword;
  99         int status;
 100         int i;
 101         int is_ifs;
 102         int saveall = 0;
 103         struct timeval tv;
 104         char *tvptr;
 105         fd_set ifds;
 106         ssize_t nread;
 107         int sig;
 108
 109         rflag = 0;
 110         prompt = NULL;
 111         tv.tv_sec = -1;
 112         tv.tv_usec = 0;
 113         while ((i = nextopt("erp:t:")) != '\0') {
 114                 switch(i) {
 115                 case 'p':
 116                         prompt = shoptarg;
 117                         break;
 118                 case 'e':
 119                         break;
 120                 case 'r':
 121                         rflag = 1;
 122                         break;
 123                 case 't':
 124                         tv.tv_sec = strtol(shoptarg, &tvptr, 0);
 125                         if (tvptr == shoptarg)
 126                                 error("timeout value");
 127                         switch(*tvptr) {
 128                         case 0:
 129                         case 's':
 130                                 break;
 131                         case 'h':
 132                                 tv.tv_sec *= 60;
 133                                 /* FALLTHROUGH */
 134                         case 'm':
 135                                 tv.tv_sec *= 60;
 136                                 break;
 137                         default:
 138                                 error("timeout unit");
 139                         }
 140                         break;
 141                 }
 142         }
 143         if (prompt && isatty(0)) {
 144                 out2str(prompt);
 145                 flushall();
 146         }
 147         if (*(ap = argptr) == NULL)
 148                 error("arg count");
 149         if ((ifs = bltinlookup("IFS", 1)) == NULL)
 150                 ifs = " \t\n";
 151
 152         if (tv.tv_sec >= 0) {
 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                 /*
 160                  * If there's nothing ready, return an error.
 161                  */
 162                 if (status <= 0) {
 163                         sig = pendingsig;
 164                         return (128 + (sig != 0 ? sig : SIGALRM));
 165                 }
 166         }
 167
 168         status = 0;
 169         startword = 2;
 170         backslash = 0;
 171         STARTSTACKSTR(p);
 172         for (;;) {
 173                 nread = read(STDIN_FILENO, &c, 1);
 174                 if (nread == -1) {
 175                         if (errno == EINTR) {
 176                                 sig = pendingsig;
 177                                 if (sig == 0)
 178                                         continue;
 179                                 status = 128 + sig;
 180                                 break;
 181                         }
 182                         warning("read error: %s", strerror(errno));
 183                         status = 2;
 184                         break;
 185                 } else if (nread != 1) {
 186                         status = 1;
 187                         break;
 188                 }
 189                 if (c == '\0')
 190                         continue;
 191                 CHECKSTRSPACE(1, p);
 192                 if (backslash) {
 193                         backslash = 0;
 194                         startword = 0;
 195                         if (c != '\n')
 196                                 USTPUTC(c, p);
 197                         continue;
 198                 }
 199                 if (!rflag && c == '\\') {
 200                         backslash++;
 201                         continue;
 202                 }
 203                 if (c == '\n')
 204                         break;
 205                 if (strchr(ifs, c))
 206                         is_ifs = strchr(" \t\n", c) ? 1 : 2;
 207                 else
 208                         is_ifs = 0;
 209
 210                 if (startword != 0) {
 211                         if (is_ifs == 1) {
 212                                 /* Ignore leading IFS whitespace */
 213                                 if (saveall)
 214                                         USTPUTC(c, p);
 215                                 continue;
 216                         }
 217                         if (is_ifs == 2 && startword == 1) {
 218                                 /* Only one non-whitespace IFS per word */
 219                                 startword = 2;
 220                                 if (saveall)
 221                                         USTPUTC(c, p);
 222                                 continue;
 223                         }
 224                 }
 225
 226                 if (is_ifs == 0) {
 227                         /* append this character to the current variable */
 228                         startword = 0;
 229                         if (saveall)
 230                                 /* Not just a spare terminator */
 231                                 saveall++;
 232                         USTPUTC(c, p);
 233                         continue;
 234                 }
 235
 236                 /* end of variable... */
 237                 startword = is_ifs;
 238
 239                 if (ap[1] == NULL) {
 240                         /* Last variable needs all IFS chars */
 241                         saveall++;
 242                         USTPUTC(c, p);
 243                         continue;
 244                 }
 245
 246                 STACKSTRNUL(p);
 247                 setvar(*ap, stackblock(), 0);
 248                 ap++;
 249                 STARTSTACKSTR(p);
 250         }
 251         STACKSTRNUL(p);
 252
 253         /* Remove trailing IFS chars */
 254         for (; stackblock() <= --p; *p = 0) {
 255                 if (!strchr(ifs, *p))
 256                         break;
 257                 if (strchr(" \t\n", *p))
 258                         /* Always remove whitespace */
 259                         continue;
 260                 if (saveall > 1)
 261                         /* Don't remove non-whitespace unless it was naked */
 262                         break;
 263         }
 264         setvar(*ap, stackblock(), 0);
 265
 266         /* Set any remaining args to "" */
 267         while (*++ap != NULL)
 268                 setvar(*ap, "", 0);
 269         return status;
 270 }
 271
 272
 273
 274 int
 275 umaskcmd(int argc __unused, char **argv __unused)
 276 {
 277         char *ap;
 278         int mask;
 279         int i;
 280         int symbolic_mode = 0;
 281
 282         while ((i = nextopt("S")) != '\0') {
 283                 symbolic_mode = 1;
 284         }
 285
 286         INTOFF;
 287         mask = umask(0);
 288         umask(mask);
 289         INTON;
 290
 291         if ((ap = *argptr) == NULL) {
 292                 if (symbolic_mode) {
 293                         char u[4], g[4], o[4];
 294
 295                         i = 0;
 296                         if ((mask & S_IRUSR) == 0)
 297                                 u[i++] = 'r';
 298                         if ((mask & S_IWUSR) == 0)
 299                                 u[i++] = 'w';
 300                         if ((mask & S_IXUSR) == 0)
 301                                 u[i++] = 'x';
 302                         u[i] = '\0';
 303
 304                         i = 0;
 305                         if ((mask & S_IRGRP) == 0)
 306                                 g[i++] = 'r';
 307                         if ((mask & S_IWGRP) == 0)
 308                                 g[i++] = 'w';
 309                         if ((mask & S_IXGRP) == 0)
 310                                 g[i++] = 'x';
 311                         g[i] = '\0';
 312
 313                         i = 0;
 314                         if ((mask & S_IROTH) == 0)
 315                                 o[i++] = 'r';
 316                         if ((mask & S_IWOTH) == 0)
 317                                 o[i++] = 'w';
 318                         if ((mask & S_IXOTH) == 0)
 319                                 o[i++] = 'x';
 320                         o[i] = '\0';
 321
 322                         out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
 323                 } else {
 324                         out1fmt("%.4o\n", mask);
 325                 }
 326         } else {
 327                 if (is_digit(*ap)) {
 328                         mask = 0;
 329                         do {
 330                                 if (*ap >= '8' || *ap < '0')
 331                                         error("Illegal number: %s", *argptr);
 332                                 mask = (mask << 3) + (*ap - '0');
 333                         } while (*++ap != '\0');
 334                         umask(mask);
 335                 } else {
 336                         void *set;
 337                         INTOFF;
 338                         if ((set = setmode (ap)) == 0)
 339                                 error("Illegal number: %s", ap);
 340
 341                         mask = getmode (set, ~mask & 0777);
 342                         umask(~mask & 0777);
 343                         free(set);
 344                         INTON;
 345                 }
 346         }
 347         return 0;
 348 }
 349
 350 /*
 351  * ulimit builtin
 352  *
 353  * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
 354  * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
 355  * ash by J.T. Conklin.
 356  *
 357  * Public domain.
 358  */
 359
 360 struct limits {
 361         const char *name;
 362         const char *units;
 363         int     cmd;
 364         int     factor; /* multiply by to get rlim_{cur,max} values */
 365         char    option;
 366 };
 367
 368 static const struct limits limits[] = {
 369 #ifdef RLIMIT_CPU
 370         { "cpu time",           "seconds",      RLIMIT_CPU,        1, 't' },
 371 #endif
 372 #ifdef RLIMIT_FSIZE
 373         { "file size",          "512-blocks",   RLIMIT_FSIZE,    512, 'f' },
 374 #endif
 375 #ifdef RLIMIT_DATA
 376         { "data seg size",      "kbytes",       RLIMIT_DATA,    1024, 'd' },
 377 #endif
 378 #ifdef RLIMIT_STACK
 379         { "stack size",         "kbytes",       RLIMIT_STACK,   1024, 's' },
 380 #endif
 381 #ifdef  RLIMIT_CORE
 382         { "core file size",     "512-blocks",   RLIMIT_CORE,     512, 'c' },
 383 #endif
 384 #ifdef RLIMIT_RSS
 385         { "max memory size",    "kbytes",       RLIMIT_RSS,     1024, 'm' },
 386 #endif
 387 #ifdef RLIMIT_MEMLOCK
 388         { "locked memory",      "kbytes",       RLIMIT_MEMLOCK, 1024, 'l' },
 389 #endif
 390 #ifdef RLIMIT_NPROC
 391         { "max user processes", (char *)0,      RLIMIT_NPROC,      1, 'u' },
 392 #endif
 393 #ifdef RLIMIT_NOFILE
 394         { "open files",         (char *)0,      RLIMIT_NOFILE,     1, 'n' },
 395 #endif
 396 #ifdef RLIMIT_VMEM
 397         { "virtual mem size",   "kbytes",       RLIMIT_VMEM,    1024, 'v' },
 398 #endif
 399 #ifdef RLIMIT_SWAP
 400         { "swap limit",         "kbytes",       RLIMIT_SWAP,    1024, 'w' },
 401 #endif
 402 #ifdef RLIMIT_SBSIZE
 403         { "sbsize",             "bytes",        RLIMIT_SBSIZE,     1, 'b' },
 404 #endif
 405 #ifdef RLIMIT_NPTS
 406         { "pseudo-terminals",   (char *)0,      RLIMIT_NPTS,       1, 'p' },
 407 #endif
 408 #ifdef RLIMIT_KQUEUES
 409         { "kqueues",            (char *)0,      RLIMIT_KQUEUES,    1, 'k' },
 410 #endif
 411         { (char *) 0,           (char *)0,      0,                 0, '\0' }
 412 };
 413
 414 enum limithow { SOFT = 0x1, HARD = 0x2 };
 415
 416 static void
 417 printlimit(enum limithow how, const struct rlimit *limit,
 418     const struct limits *l)
 419 {
 420         rlim_t val = 0;
 421
 422         if (how & SOFT)
 423                 val = limit->rlim_cur;
 424         else if (how & HARD)
 425                 val = limit->rlim_max;
 426         if (val == RLIM_INFINITY)
 427                 out1str("unlimited\n");
 428         else
 429         {
 430                 val /= l->factor;
 431                 out1fmt("%jd\n", (intmax_t)val);
 432         }
 433 }
 434
 435 int
 436 ulimitcmd(int argc __unused, char **argv __unused)
 437 {
 438         rlim_t val = 0;
 439         enum limithow how = SOFT | HARD;
 440         const struct limits     *l;
 441         int             set, all = 0;
 442         int             optc, what;
 443         struct rlimit   limit;
 444
 445         what = 'f';
 446         while ((optc = nextopt("HSatfdsmcnuvlbpwk")) != '\0')
 447                 switch (optc) {
 448                 case 'H':
 449                         how = HARD;
 450                         break;
 451                 case 'S':
 452                         how = SOFT;
 453                         break;
 454                 case 'a':
 455                         all = 1;
 456                         break;
 457                 default:
 458                         what = optc;
 459                 }
 460
 461         for (l = limits; l->name && l->option != what; l++)
 462                 ;
 463         if (!l->name)
 464                 error("internal error (%c)", what);
 465
 466         set = *argptr ? 1 : 0;
 467         if (set) {
 468                 char *p = *argptr;
 469
 470                 if (all || argptr[1])
 471                         error("too many arguments");
 472                 if (strcmp(p, "unlimited") == 0)
 473                         val = RLIM_INFINITY;
 474                 else {
 475                         char *end;
 476                         uintmax_t uval;
 477
 478                         if (*p < '0' || *p > '9')
 479                                 error("bad number");
 480                         errno = 0;
 481                         uval = strtoumax(p, &end, 10);
 482                         if (errno != 0 || *end != '\0')
 483                                 error("bad number");
 484                         if (uval > UINTMAX_MAX / l->factor)
 485                                 error("bad number");
 486                         uval *= l->factor;
 487                         val = (rlim_t)uval;
 488                         if (val < 0 || (uintmax_t)val != uval ||
 489                             val == RLIM_INFINITY)
 490                                 error("bad number");
 491                 }
 492         }
 493         if (all) {
 494                 for (l = limits; l->name; l++) {
 495                         char optbuf[40];
 496                         if (getrlimit(l->cmd, &limit) < 0)
 497                                 error("can't get limit: %s", strerror(errno));
 498
 499                         if (l->units)
 500                                 snprintf(optbuf, sizeof(optbuf),
 501                                         "(%s, -%c) ", l->units, l->option);
 502                         else
 503                                 snprintf(optbuf, sizeof(optbuf),
 504                                         "(-%c) ", l->option);
 505                         out1fmt("%-18s %18s ", l->name, optbuf);
 506                         printlimit(how, &limit, l);
 507                 }
 508                 return 0;
 509         }
 510
 511         if (getrlimit(l->cmd, &limit) < 0)
 512                 error("can't get limit: %s", strerror(errno));
 513         if (set) {
 514                 if (how & SOFT)
 515                         limit.rlim_cur = val;
 516                 if (how & HARD)
 517                         limit.rlim_max = val;
 518                 if (setrlimit(l->cmd, &limit) < 0)
 519                         error("bad limit: %s", strerror(errno));
 520         } else
 521                 printlimit(how, &limit, l);
 522         return 0;
 523 }