c_ulimit.c revision 1.11
1 /* $NetBSD: c_ulimit.c,v 1.11 2015/05/09 13:22:37 christos Exp $ */ 2 3 /* 4 ulimit -- handle "ulimit" builtin 5 6 Reworked to use getrusage() and ulimit() at once (as needed on 7 some schizophrenic systems, eg, HP-UX 9.01), made argument parsing 8 conform to at&t ksh, added autoconf support. Michael Rendell, May, '94 9 10 Eric Gisin, September 1988 11 Adapted to PD KornShell. Removed AT&T code. 12 13 last edit: 06-Jun-1987 D A Gwyn 14 15 This started out as the BRL UNIX System V system call emulation 16 for 4.nBSD, and was later extended by Doug Kingston to handle 17 the extended 4.nBSD resource limits. It now includes the code 18 that was originally under case SYSULIMIT in source file "xec.c". 19 */ 20 #include <sys/cdefs.h> 21 22 #ifndef lint 23 __RCSID("$NetBSD: c_ulimit.c,v 1.11 2015/05/09 13:22:37 christos Exp $"); 24 #endif 25 26 27 #include "sh.h" 28 #include "ksh_time.h" 29 #ifdef HAVE_SYS_RESOURCE_H 30 # include <sys/resource.h> 31 #endif /* HAVE_SYS_RESOURCE_H */ 32 #ifdef HAVE_ULIMIT_H 33 # include <ulimit.h> 34 #else /* HAVE_ULIMIT_H */ 35 # ifdef HAVE_ULIMIT 36 extern long ulimit(); 37 # endif /* HAVE_ULIMIT */ 38 #endif /* HAVE_ULIMIT_H */ 39 40 #define SOFT 0x1 41 #define HARD 0x2 42 43 #ifdef RLIM_INFINITY 44 # define KSH_RLIM_INFINITY RLIM_INFINITY 45 #else 46 # define KSH_RLIM_INFINITY ((rlim_t) 1 << (sizeof(rlim_t) * 8 - 1) - 1) 47 #endif /* RLIM_INFINITY */ 48 49 int 50 c_ulimit(wp) 51 char **wp; 52 { 53 static const struct limits { 54 const char *name; 55 enum { RLIMIT, ULIMIT } which; 56 int gcmd; /* get command */ 57 int scmd; /* set command (or -1, if no set command) */ 58 int factor; /* multiply by to get rlim_{cur,max} values */ 59 char option; 60 } limits[] = { 61 /* Do not use options -H, -S or -a */ 62 #ifdef RLIMIT_CPU 63 { "time(cpu-seconds)", RLIMIT, RLIMIT_CPU, RLIMIT_CPU, 1, 't' }, 64 #endif 65 #ifdef RLIMIT_FSIZE 66 { "file(blocks)", RLIMIT, RLIMIT_FSIZE, RLIMIT_FSIZE, 512, 'f' }, 67 #else /* RLIMIT_FSIZE */ 68 # ifdef UL_GETFSIZE /* x/open */ 69 { "file(blocks)", ULIMIT, UL_GETFSIZE, UL_SETFSIZE, 1, 'f' }, 70 # else /* UL_GETFSIZE */ 71 # ifdef UL_GFILLIM /* svr4/xenix */ 72 { "file(blocks)", ULIMIT, UL_GFILLIM, UL_SFILLIM, 1, 'f' }, 73 # else /* UL_GFILLIM */ 74 { "file(blocks)", ULIMIT, 1, 2, 1, 'f' }, 75 # endif /* UL_GFILLIM */ 76 # endif /* UL_GETFSIZE */ 77 #endif /* RLIMIT_FSIZE */ 78 #ifdef RLIMIT_CORE 79 { "coredump(blocks)", RLIMIT, RLIMIT_CORE, RLIMIT_CORE, 512, 'c' }, 80 #endif 81 #ifdef RLIMIT_DATA 82 { "data(kbytes)", RLIMIT, RLIMIT_DATA, RLIMIT_DATA, 1024, 'd' }, 83 #endif 84 #ifdef RLIMIT_STACK 85 { "stack(kbytes)", RLIMIT, RLIMIT_STACK, RLIMIT_STACK, 1024, 's' }, 86 #endif 87 #ifdef RLIMIT_MEMLOCK 88 { "lockedmem(kbytes)", RLIMIT, RLIMIT_MEMLOCK, RLIMIT_MEMLOCK, 1024, 'l' }, 89 #endif 90 #ifdef RLIMIT_RSS 91 { "memory(kbytes)", RLIMIT, RLIMIT_RSS, RLIMIT_RSS, 1024, 'm' }, 92 #endif 93 #ifdef RLIMIT_NOFILE 94 { "nofiles(descriptors)", RLIMIT, RLIMIT_NOFILE, RLIMIT_NOFILE, 1, 'n' }, 95 #else /* RLIMIT_NOFILE */ 96 # ifdef UL_GDESLIM /* svr4/xenix */ 97 { "nofiles(descriptors)", ULIMIT, UL_GDESLIM, -1, 1, 'n' }, 98 # endif /* UL_GDESLIM */ 99 #endif /* RLIMIT_NOFILE */ 100 #ifdef RLIMIT_NPROC 101 { "processes", RLIMIT, RLIMIT_NPROC, RLIMIT_NPROC, 1, 'p' }, 102 #endif 103 #ifdef RLIMIT_NTHR 104 { "threads", RLIMIT, RLIMIT_NTHR, RLIMIT_NTHR, 1, 'r' }, 105 #endif 106 #ifdef RLIMIT_VMEM 107 { "vmemory(kbytes)", RLIMIT, RLIMIT_VMEM, RLIMIT_VMEM, 1024, 'v' }, 108 #else /* RLIMIT_VMEM */ 109 /* These are not quite right - really should subtract etext or something */ 110 # ifdef UL_GMEMLIM /* svr4/xenix */ 111 { "vmemory(maxaddr)", ULIMIT, UL_GMEMLIM, -1, 1, 'v' }, 112 # else /* UL_GMEMLIM */ 113 # ifdef UL_GETBREAK /* osf/1 */ 114 { "vmemory(maxaddr)", ULIMIT, UL_GETBREAK, -1, 1, 'v' }, 115 # else /* UL_GETBREAK */ 116 # ifdef UL_GETMAXBRK /* hpux */ 117 { "vmemory(maxaddr)", ULIMIT, UL_GETMAXBRK, -1, 1, 'v' }, 118 # endif /* UL_GETMAXBRK */ 119 # endif /* UL_GETBREAK */ 120 # endif /* UL_GMEMLIM */ 121 #endif /* RLIMIT_VMEM */ 122 #ifdef RLIMIT_SWAP 123 { "swap(kbytes)", RLIMIT, RLIMIT_SWAP, RLIMIT_SWAP, 1024, 'w' }, 124 #endif 125 #ifdef RLIMIT_SBSIZE 126 { "sbsize(bytes)", RLIMIT, RLIMIT_SBSIZE, RLIMIT_SBSIZE, 1, 'b' }, 127 #endif 128 { .name = NULL } 129 }; 130 static char options[3 + NELEM(limits)]; 131 rlim_t UNINITIALIZED(val); 132 int how = SOFT | HARD; 133 const struct limits *l; 134 int set, all = 0; 135 int optc, what; 136 #ifdef HAVE_SETRLIMIT 137 struct rlimit limit; 138 #endif /* HAVE_SETRLIMIT */ 139 140 if (!options[0]) { 141 /* build options string on first call - yuck */ 142 char *p = options; 143 144 *p++ = 'H'; *p++ = 'S'; *p++ = 'a'; 145 for (l = limits; l->name; l++) 146 *p++ = l->option; 147 *p = '\0'; 148 } 149 what = 'f'; 150 while ((optc = ksh_getopt(wp, &builtin_opt, options)) != EOF) 151 switch (optc) { 152 case 'H': 153 how = HARD; 154 break; 155 case 'S': 156 how = SOFT; 157 break; 158 case 'a': 159 all = 1; 160 break; 161 case '?': 162 return 1; 163 default: 164 what = optc; 165 } 166 167 for (l = limits; l->name && l->option != what; l++) 168 ; 169 if (!l->name) { 170 internal_errorf(0, "ulimit: %c", what); 171 return 1; 172 } 173 174 wp += builtin_opt.optind; 175 set = *wp ? 1 : 0; 176 if (set) { 177 if (all || wp[1]) { 178 bi_errorf("too many arguments"); 179 return 1; 180 } 181 if (strcmp(wp[0], "unlimited") == 0) 182 val = KSH_RLIM_INFINITY; 183 else { 184 long rval; 185 186 if (!evaluate(wp[0], &rval, KSH_RETURN_ERROR)) 187 return 1; 188 /* Avoid problems caused by typos that 189 * evaluate misses due to evaluating unset 190 * parameters to 0... 191 * If this causes problems, will have to 192 * add parameter to evaluate() to control 193 * if unset params are 0 or an error. 194 */ 195 if (!rval && !digit(wp[0][0])) { 196 bi_errorf("invalid limit: %s", wp[0]); 197 return 1; 198 } 199 val = (u_long)rval * l->factor; 200 } 201 } 202 if (all) { 203 for (l = limits; l->name; l++) { 204 #ifdef HAVE_SETRLIMIT 205 if (l->which == RLIMIT) { 206 if (getrlimit(l->gcmd, &limit) == -1) 207 val = RLIM_INFINITY; 208 else if (how & SOFT) 209 val = limit.rlim_cur; 210 else if (how & HARD) 211 val = limit.rlim_max; 212 } else 213 #endif /* HAVE_SETRLIMIT */ 214 #ifdef HAVE_ULIMIT 215 { 216 val = ulimit(l->gcmd, (rlim_t) 0); 217 } 218 #else /* HAVE_ULIMIT */ 219 ; 220 #endif /* HAVE_ULIMIT */ 221 shprintf("%-20s ", l->name); 222 #ifdef RLIM_INFINITY 223 if (val == RLIM_INFINITY) 224 shprintf("unlimited\n"); 225 else 226 #endif /* RLIM_INFINITY */ 227 { 228 val /= l->factor; 229 shprintf("%ld\n", (long) val); 230 } 231 } 232 return 0; 233 } 234 #ifdef HAVE_SETRLIMIT 235 if (l->which == RLIMIT) { 236 getrlimit(l->gcmd, &limit); 237 if (set) { 238 if (how & SOFT) 239 limit.rlim_cur = val; 240 if (how & HARD) 241 limit.rlim_max = val; 242 if (setrlimit(l->scmd, &limit) < 0) { 243 if (errno == EPERM) 244 bi_errorf("exceeds allowable limit"); 245 else 246 bi_errorf("bad limit: %s", 247 strerror(errno)); 248 return 1; 249 } 250 } else { 251 if (how & SOFT) 252 val = limit.rlim_cur; 253 else if (how & HARD) 254 val = limit.rlim_max; 255 } 256 } else 257 #endif /* HAVE_SETRLIMIT */ 258 #ifdef HAVE_ULIMIT 259 { 260 if (set) { 261 if (l->scmd == -1) { 262 bi_errorf("can't change limit"); 263 return 1; 264 } else if (ulimit(l->scmd, val) < 0) { 265 bi_errorf("bad limit: %s", strerror(errno)); 266 return 1; 267 } 268 } else 269 val = ulimit(l->gcmd, (rlim_t) 0); 270 } 271 #else /* HAVE_ULIMIT */ 272 ; 273 #endif /* HAVE_ULIMIT */ 274 if (!set) { 275 #ifdef RLIM_INFINITY 276 if (val == RLIM_INFINITY) 277 shprintf("unlimited\n"); 278 else 279 #endif /* RLIM_INFINITY */ 280 { 281 val /= l->factor; 282 shprintf("%ld\n", (long) val); 283 } 284 } 285 return 0; 286 } 287
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