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annotate toys/other/taskset.c @ 1775:57f2a26fa92c draft toast

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To ensure that toybox can be installed alongside busybox without confusing update-alternatives, the paths of the links installed by toybox should match those installed by busybox. This is accomplished by changing the flags of a few tools within toybox.
author Paul Barker <paul@paulbarker.me.uk>
date Sat, 04 Apr 2015 11:58:06 -0500
parents cbb1aca81eca
children
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1 /* taskset.c - Retrieve or set the CPU affinity of a process.
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2 *
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3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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5 USE_TASKSET(NEWTOY(taskset, "<1^pa", TOYFLAG_BIN|TOYFLAG_STAYROOT))
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6
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7 config TASKSET
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8 bool "taskset"
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9 default y
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10 help
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11 usage: taskset [-ap] [mask] [PID | cmd [args...]]
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13 Launch a new task which may only run on certain processors, or change
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14 the processor affinity of an exisitng PID.
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16 Mask is a hex string where each bit represents a processor the process
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17 is allowed to run on. PID without a mask displays existing affinity.
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19 -p Set/get the affinity of given PID instead of a new command.
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20 -a Set/get the affinity of all threads of the PID.
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21 */
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7e846e281e38 New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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23 #define FOR_taskset
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24 #include "toys.h"
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26 #include <sys/syscall.h>
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27 #define sched_setaffinity(pid, size, cpuset) \
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28 syscall(__NR_sched_setaffinity, (pid_t)pid, (size_t)size, (void *)cpuset)
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29 #define sched_getaffinity(pid, size, cpuset) \
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30 syscall(__NR_sched_getaffinity, (pid_t)pid, (size_t)size, (void *)cpuset)
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32 // mask is an array of long, which makes the layout a bit weird on big
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33 // endian systems but as long as it's consistent...
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35 static void do_taskset(pid_t pid, int quiet)
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36 {
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37 unsigned long *mask = (unsigned long *)toybuf;
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38 char *s = *toys.optargs, *failed = "failed to %s %d's affinity";
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39 int i, j, k;
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41 for (i=0; ; i++) {
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42 if (!quiet) {
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43 int j = sizeof(toybuf), flag = 0;
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44
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45 if (-1 == sched_getaffinity(pid, sizeof(toybuf), (void *)mask))
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46 perror_exit(failed, "get", pid);
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48 printf("pid %d's %s affinity mask: ", pid, i ? "new" : "current");
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50 while (j--) {
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51 int x = 255 & (mask[j/sizeof(long)] >> (8*(j&(sizeof(long)-1))));
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53 if (flag) printf("%02x", x);
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54 else if (x) {
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55 flag++;
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56 printf("%x", x);
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57 }
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58 }
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59 putchar('\n');
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60 }
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62 if (i || toys.optc < 2) return;
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64 memset(toybuf, 0, sizeof(toybuf));
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65 k = strlen(s = *toys.optargs);
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66 s += k;
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67 for (j = 0; j<k; j++) {
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68 unsigned long digit = *(--s) - '0';
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70 if (digit > 9) digit = 10 + tolower(*s)-'a';
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71 if (digit > 15) error_exit("bad mask '%s'", *toys.optargs);
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72 mask[j/(2*sizeof(long))] |= digit << 4*(j&((2*sizeof(long))-1));
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73 }
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75 if (-1 == sched_setaffinity(pid, sizeof(toybuf), (void *)mask))
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76 perror_exit(failed, "set", pid);
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77 }
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78 }
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80 static int task_callback(struct dirtree *new)
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81 {
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82 if (!new->parent) return DIRTREE_RECURSE;
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83 if (isdigit(*new->name)) do_taskset(atoi(new->name), 0);
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85 return 0;
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86 }
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87
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88 void taskset_main(void)
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89 {
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90 if (!(toys.optflags & FLAG_p)) {
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91 if (toys.optc < 2) error_exit("Needs 2 args");
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92 do_taskset(getpid(), 1);
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93 xexec(toys.optargs+1);
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94 } else {
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95 char *c;
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96 pid_t pid = strtol(toys.optargs[toys.optc-1], &c, 10);
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97
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parents: 674
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98 if (*c) error_exit("Not int %s", toys.optargs[1]);
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99
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parents: 674
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100 if (toys.optflags & FLAG_a) {
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parents: 674
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101 char buf[33];
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parents: 674
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102 sprintf(buf, "/proc/%ld/task/", (long)pid);
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Rob Landley <rob@landley.net>
parents: 674
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103 dirtree_read(buf, task_callback);
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parents: 674
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104 } else do_taskset(pid, 0);
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Rob Landley <rob@landley.net>
parents: 674
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105 }
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106 }