1 '\" te
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   6 .TH RCTLBLK_SET_VALUE 3C "Aug 2, 2016"
   7 .SH NAME
   8 rctlblk_set_value, rctlblk_get_firing_time, rctlblk_get_global_action,
   9 rctlblk_get_global_flags, rctlblk_get_local_action, rctlblk_get_local_flags,
  10 rctlblk_get_privilege, rctlblk_get_recipient_pid, rctlblk_get_value,
  11 rctlblk_get_enforced_value, rctlblk_set_local_action, rctlblk_set_local_flags,
  12 rctlblk_set_privilege, rctlblk_set_recipient_pid, rctlblk_size \- manipulate
  13 resource control blocks
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 #include <rctl.h>
  18 
  19 \fBhrtime_t\fR  \fBrctlblk_get_firing_time\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  20 .fi
  21 
  22 .LP
  23 .nf
  24 \fBint\fR \fBrctlblk_get_global_action\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  25 .fi
  26 
  27 .LP
  28 .nf
  29 \fBint\fR \fBrctlblk_get_global_flags\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  30 .fi
  31 
  32 .LP
  33 .nf
  34 \fBint\fR \fBrctlblk_get_local_action\fR(\fBrctlblk_t *\fR\fIrblk\fR, \fBint *\fR\fIsignalp\fR);
  35 .fi
  36 
  37 .LP
  38 .nf
  39 \fBint\fR \fBrctlblk_get_local_flags\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  40 .fi
  41 
  42 .LP
  43 .nf
  44 \fBrctl_priv_t\fR  \fBrctlblk_get_privilege\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  45 .fi
  46 
  47 .LP
  48 .nf
  49 \fBid_t\fR \fBrctlblk_get_recipient_pid\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  50 .fi
  51 
  52 .LP
  53 .nf
  54 \fBrctl_qty_t\fR  \fBrctlblk_get_value\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  55 .fi
  56 
  57 .LP
  58 .nf
  59 \fBrctl_qty_t\fR  \fBrctlblk_get_enforced_value\fR(\fBrctlblk_t *\fR\fIrblk\fR);
  60 .fi
  61 
  62 .LP
  63 .nf
  64 \fBvoid\fR \fBrctlblk_set_local_action\fR(\fBrctlblk_t *\fR\fIrblk\fR, \fBrctl_action_t\fR \fIaction\fR,
  65      \fBint\fR \fIsignal\fR);
  66 .fi
  67 
  68 .LP
  69 .nf
  70 \fBvoid\fR \fBrctlblk_set_local_flags\fR(\fBrctlblk_t *\fR\fIrblk\fR, \fBint\fR \fIflags\fR);
  71 .fi
  72 
  73 .LP
  74 .nf
  75 \fBvoid\fR \fBrctlblk_set_privilege\fR(\fBrctlblk_t *\fR\fIrblk\fR, \fBrctl_priv_t\fR \fIprivilege\fR);
  76 .fi
  77 
  78 .LP
  79 .nf
  80 \fBvoid\fR \fBrctlblk_set_value\fR(\fBrctlblk_t *\fR\fIrblk\fR, \fBrctl_qty_t\fR \fIvalue\fR);
  81 .fi
  82 
  83 .LP
  84 .nf
  85 \fBvoid\fR  \fBrctlblk_set_recipient_pid\fR(\fBid_t\fR\fIpid\fR);
  86 .fi
  87 
  88 .LP
  89 .nf
  90 \fBsize_t\fR \fBrctlblk_size\fR(\fBvoid\fR);
  91 .fi
  92 
  93 .SH DESCRIPTION
  94 .LP
  95 The resource control block routines allow the establishment or retrieval of
  96 values from a resource control block used to transfer information using the
  97 \fBgetrctl\fR(2) and \fBsetrctl\fR(2) functions. Each of the routines accesses
  98 or sets the resource control block member corresponding to its name.  Certain
  99 of these members are read-only and do not possess set routines.
 100 .sp
 101 .LP
 102 The firing time of a resource control block is 0 if the resource control
 103 action-value has not been exceeded for its lifetime on the process.  Otherwise
 104 the firing time is the value of \fBgethrtime\fR(3C) at the moment the action on
 105 the resource control value was taken.
 106 .sp
 107 .LP
 108 The global actions and flags are the action and flags set by \fBrctladm\fR(1M).
 109 These values cannot be set with \fBsetrctl\fR(2).  Valid global actions are
 110 listed in the table below. Global flags are generally a published property of
 111 the control and are not modifiable.
 112 .sp
 113 .ne 2
 114 .na
 115 \fB\fBRCTL_GLOBAL_DENY_ALWAYS\fR\fR
 116 .ad
 117 .RS 28n
 118 The action taken when a control value is exceeded on this control will always
 119 include denial of the resource.
 120 .RE
 121 
 122 .sp
 123 .ne 2
 124 .na
 125 \fB\fBRCTL_GLOBAL_DENY_NEVER\fR\fR
 126 .ad
 127 .RS 28n
 128 The action taken when a control value is exceeded on this control will always
 129 exclude denial of the resource; the resource will always be granted, although
 130 other actions can also be taken.
 131 .RE
 132 
 133 .sp
 134 .ne 2
 135 .na
 136 \fB\fBRCTL_GLOBAL_SIGNAL_NEVER\fR\fR
 137 .ad
 138 .RS 28n
 139 No signal actions are permitted on this control.
 140 .RE
 141 
 142 .sp
 143 .ne 2
 144 .na
 145 \fB\fBRCTL_GLOBAL_CPU_TIME\fR\fR
 146 .ad
 147 .RS 28n
 148 The valid signals available as local actions include the \fBSIGXCPU\fR signal.
 149 .RE
 150 
 151 .sp
 152 .ne 2
 153 .na
 154 \fB\fBRCTL_GLOBAL_FILE_SIZE\fR\fR
 155 .ad
 156 .RS 28n
 157 The valid signals available as local actions include the \fBSIGXFSZ\fR signal.
 158 .RE
 159 
 160 .sp
 161 .ne 2
 162 .na
 163 \fB\fBRCTL_GLOBAL_INFINITE\fR\fR
 164 .ad
 165 .RS 28n
 166 This resource control supports the concept of an unlimited value; generally
 167 true only of accumulation-oriented resources, such as CPU time.
 168 .RE
 169 
 170 .sp
 171 .ne 2
 172 .na
 173 \fB\fBRCTL_GLOBAL_LOWERABLE\fR\fR
 174 .ad
 175 .RS 28n
 176 Non-privileged callers are able to lower the value of privileged resource
 177 control values on this control.
 178 .RE
 179 
 180 .sp
 181 .ne 2
 182 .na
 183 \fB\fBRCTL_GLOBAL_NOACTION\fR\fR
 184 .ad
 185 .RS 28n
 186 No global action will be taken when a resource control value is exceeded on
 187 this control.
 188 .RE
 189 
 190 .sp
 191 .ne 2
 192 .na
 193 \fB\fBRCTL_GLOBAL_NOBASIC\fR\fR
 194 .ad
 195 .RS 28n
 196 No values with the \fBRCPRIV_BASIC\fR privilege are permitted on this control.
 197 .RE
 198 
 199 .sp
 200 .ne 2
 201 .na
 202 \fB\fBRCTL_GLOBAL_SYSLOG\fR\fR
 203 .ad
 204 .RS 28n
 205 A standard message will be logged by the \fBsyslog\fR(3C) facility when any
 206 resource control value on a sequence associated with this control is exceeded.
 207 .RE
 208 
 209 .sp
 210 .ne 2
 211 .na
 212 \fB\fBRCTL_GLOBAL_SYSLOG_NEVER\fR\fR
 213 .ad
 214 .RS 28n
 215 The resource control does not support the \fBsyslog()\fR global action.
 216 Exceeding a resource control value on this control will not result in a message
 217 logged by the \fBsyslog()\fR facility.
 218 .RE
 219 
 220 .sp
 221 .ne 2
 222 .na
 223 \fB\fBRCTL_GLOBAL_UNOBSERVABLE\fR\fR
 224 .ad
 225 .RS 28n
 226 The resource control (generally on a task- or project-related control) does not
 227 support observational control values. An \fBRCPRIV_BASIC\fR privileged control
 228 value placed by a process on the task or process will generate an action only
 229 if the value is exceeded by that process.
 230 .RE
 231 
 232 .sp
 233 .ne 2
 234 .na
 235 \fB\fBRCTL_GLOBAL_BYTES\fR\fR
 236 .ad
 237 .RS 28n
 238 This resource control represents a number of bytes.
 239 .RE
 240 
 241 .sp
 242 .ne 2
 243 .na
 244 \fB\fBRCTL_GLOBAL_SECONDS\fR\fR
 245 .ad
 246 .RS 28n
 247 This resource control represents a quantity of time in seconds.
 248 .RE
 249 
 250 .sp
 251 .ne 2
 252 .na
 253 \fB\fBRCTL_GLOBAL_COUNT\fR\fR
 254 .ad
 255 .RS 28n
 256 This resource control represents an integer count.
 257 .RE
 258 
 259 .sp
 260 .LP
 261 The local action and flags are those on the current resource control value
 262 represented by this resource control block. Valid actions and flags are listed
 263 in the table below. In the case of \fBRCTL_LOCAL_SIGNAL\fR, the second argument
 264 to \fBrctlblk_set_local_action()\fR contains the signal to be sent. Similarly,
 265 the signal to be sent is copied into the integer location specified by the
 266 second argument to \fBrctlblk_get_local_action()\fR. A restricted set of
 267 signals is made available for normal use by the resource control facility:
 268 \fBSIGBART\fR, \fBSIGXRES\fR, \fBSIGHUP\fR, \fBSIGSTOP\fR, \fBSIGTERM\fR, and
 269 \fBSIGKILL\fR. Other signals are permitted due to global properties of a
 270 specific control. Calls to \fBsetrctl()\fR with illegal signals will fail.
 271 .sp
 272 .ne 2
 273 .na
 274 \fB\fBRCTL_LOCAL_DENY\fR\fR
 275 .ad
 276 .RS 23n
 277 When this resource control value is encountered, the request for the resource
 278 will be denied. Set on all values if \fBRCTL_GLOBAL_DENY_ALWAYS\fR is set for
 279 this control; cleared on all values if \fBRCTL_GLOBAL_DENY_NEVER\fR is set for
 280 this control.
 281 .RE
 282 
 283 .sp
 284 .ne 2
 285 .na
 286 \fB\fBRCTL_LOCAL_MAXIMAL\fR\fR
 287 .ad
 288 .RS 23n
 289 This resource control value represents a request for the maximum amount of
 290 resource for this control. If \fBRCTL_GLOBAL_INFINITE\fR is set for this
 291 resource control, \fBRCTL_LOCAL_MAXIMAL\fR indicates an unlimited resource
 292 control value, one that will never be exceeded.
 293 .RE
 294 
 295 .sp
 296 .ne 2
 297 .na
 298 \fB\fBRCTL_LOCAL_NOACTION\fR\fR
 299 .ad
 300 .RS 23n
 301 No local action will be taken when this resource control value is exceeded.
 302 .RE
 303 
 304 .sp
 305 .ne 2
 306 .na
 307 \fB\fBRCTL_LOCAL_SIGNAL\fR\fR
 308 .ad
 309 .RS 23n
 310 The specified signal, sent by \fBrctlblk_set_local_action()\fR, will be sent to
 311 the process that placed this resource control value in the value sequence. This
 312 behavior is also true for signal actions on project and task resource controls.
 313 The specified signal is sent only to the recipient process, not all processes
 314 within the project or task.
 315 .RE
 316 
 317 .sp
 318 .LP
 319 The \fBrctlblk_get_recipient_pid()\fR function returns the value of the process
 320 ID that placed the resource control value for basic rctls. For privileged or
 321 system rctls, \fBrctlblk_get_recipient_pid()\fR returns -1.
 322 .sp
 323 .LP
 324 The \fBrctlblk_set_recipient_pid()\fR function sets the recipient \fIpid\fR for
 325 a basic rctl. When \fBsetrctl\fR(2) is called with the flag
 326 \fBRCTL_USE_RECIPIENT_PID\fR, this \fIpid\fR is used. Otherwise, the PID of the
 327 calling process is used. Only privileged users can set the recipient PID to one
 328 other than the PID of the calling process.  Process-scoped rctls must have a
 329 recipient PID that matches the PID of the calling process.
 330 .sp
 331 .LP
 332 The \fBrctlblk_get_privilege()\fR function returns the privilege of the
 333 resource control block. Valid privileges are \fBRCPRIV_BASIC\fR,
 334 \fBRCPRIV_PRIVILEGED\fR, and \fBRCPRIV_SYSTEM\fR. System resource controls are
 335 read-only. Privileged resource controls require the {\fBPRIV_SYS_RESOURCE\fR}
 336 privilege to write, unless the \fBRCTL_GLOBAL_LOWERABLE\fR global flag is set,
 337 in which case unprivileged applications can lower the value of a privileged
 338 control.
 339 .sp
 340 .LP
 341 The \fBrctlblk_get_value()\fR and \fBrctlblk_set_value()\fR functions return or
 342 establish the enforced value associated with the resource control. In cases
 343 where the process, task, or project associated with the control possesses fewer
 344 capabilities than allowable by the current value, the value returned by
 345 \fBrctlblk_get_enforced_value()\fR will differ from that returned by
 346 \fBrctlblk_get_value()\fR. This capability difference arises with processes
 347 using an address space model smaller than the maximum address space model
 348 supported by the system.
 349 .sp
 350 .LP
 351 The \fBrctlblk_size()\fR function returns the size of a resource control block
 352 for use in memory allocation. The \fBrctlblk_t *\fR type is an opaque pointer
 353 whose size is not connected with that of the resource control block itself. Use
 354 of \fBrctlblk_size()\fR is illustrated in the example below.
 355 .SH RETURN VALUES
 356 .LP
 357 The various set routines have no return values. Incorrectly composed resource
 358 control blocks will generate errors when used with \fBsetrctl\fR(2) or
 359 \fBgetrctl\fR(2).
 360 .SH ERRORS
 361 .LP
 362 No error values are returned. Incorrectly constructed resource control blocks
 363 will be rejected by the system calls.
 364 .SH EXAMPLES
 365 .LP
 366 \fBExample 1 \fRDisplay the contents of a fetched resource control block.
 367 .sp
 368 .LP
 369 The following example displays the contents of a fetched resource control
 370 block.
 371 
 372 .sp
 373 .in +2
 374 .nf
 375 #include <rctl.h>
 376 #include <stdio.h>
 377 #include <stdlib.h>
 378 
 379 int
 380 main()
 381 {
 382         rctlblk_t *rblk;
 383         int rsignal, raction;
 384 
 385         if ((rblk = malloc(rctlblk_size())) == NULL) {
 386                 (void) perror("rblk malloc");
 387                 exit(1);
 388         }
 389 
 390         if (getrctl("process.max-cpu-time", NULL, rblk, RCTL_FIRST) == -1) {
 391                 (void) perror("getrctl");
 392                 exit(1);
 393         }
 394 
 395         raction = rctlblk_get_local_action(rblk, &rsignal),
 396         (void) printf("Resource control for %s\en",
 397             "process.max-cpu-time");
 398         (void) printf("Process ID:     %d\en",
 399             (int)rctlblk_get_recipient_pid(rblk));
 400         (void) printf("Privilege:      %x\en",
 401             rctlblk_get_privilege(rblk));
 402         (void) printf("Global flags:   %x\en",
 403             rctlblk_get_global_flags(rblk));
 404         (void) printf("Global actions: %x\en",
 405             rctlblk_get_global_action(rblk));
 406         (void) printf("Local flags:    %x\en",
 407             rctlblk_get_local_flags(rblk));
 408         (void) printf("Local action:   %x (%d)\en",
 409             raction, raction == RCTL_LOCAL_SIGNAL ? rsignal : 0);
 410         (void) printf("Value:          %llu\en",
 411             rctlblk_get_value(rblk));
 412         (void) printf("\tEnforced value: %llu\en",
 413             rctlblk_get_enforced_value(rblk));
 414 
 415         return (0);
 416 }
 417 .fi
 418 .in -2
 419 
 420 .SH ATTRIBUTES
 421 .LP
 422 See \fBattributes\fR(5) for descriptions of the following attributes:
 423 .sp
 424 
 425 .sp
 426 .TS
 427 box;
 428 c | c
 429 l | l .
 430 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 431 _
 432 Interface Stability     Evolving
 433 _
 434 MT-Level        MT-Safe
 435 .TE
 436 
 437 .SH SEE ALSO
 438 .LP
 439 \fBrctladm\fR(1M), \fBgetrctl\fR(2), \fBsetrctl\fR(2), \fBgethrtime\fR(3C),
 440 \fBattributes\fR(5)