{"id":256,"date":"2014-03-27T09:44:03","date_gmt":"2014-03-27T09:44:03","guid":{"rendered":"http:\/\/queen.run.montefiore.ulg.ac.be\/~barbette\/?p=256"},"modified":"2015-02-12T13:48:27","modified_gmt":"2015-02-12T12:48:27","slug":"standalone-version-of-chrt","status":"publish","type":"post","link":"https:\/\/perso.uclouvain.be\/tom.barbette\/standalone-version-of-chrt\/","title":{"rendered":"Standalone version of chrt"},"content":{"rendered":"<p>This is a modification of the program chrt (used to change the policy of a process) which has no external dependencies. It can be compiled using &#8220;gcc -o chrt chrt.c&#8221;.<\/p>\n<p>&nbsp;<\/p>\n<pre>[code]\/*\r\n * chrt.c - chrt\r\n * Command-line utility for manipulating a task's real-time attributes \r\n *\r\n * Robert Love &lt;rml@tech9.net&gt;\r\n * 27-Apr-2002: initial version\r\n *\r\n * This program is free software; you can redistribute it and\/or modify\r\n * it under the terms of the GNU General Public License, v2, as\r\n * published by the Free Software Foundation\r\n *\r\n * This program is distributed in the hope that it will be useful,\r\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\r\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r\n * GNU General Public License for more details.\r\n *\r\n * You should have received a copy of the GNU General Public License\r\n * along with this program; if not, write to the Free Software\r\n * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\r\n *\r\n * Copyright (C) 2004 Robert Love\r\n *\/\r\n\r\n#include &lt;stdio.h&gt;\r\n#include &lt;stdlib.h&gt;\r\n#include &lt;sched.h&gt;\r\n#include &lt;unistd.h&gt;\r\n#include &lt;getopt.h&gt;\r\n#include &lt;errno.h&gt;\r\n#include &lt;err.h&gt;\r\n\r\n#define PACKAGE_STRING \"modified for greentask\"\r\n#define FALSE 0\r\n#define TRUE 1\r\n\r\n\/* the SCHED_BATCH is supported since Linux 2.6.16\r\n *  -- temporary workaround for people with old glibc headers\r\n *\/\r\n#if defined (__linux__) &amp;&amp; !defined(SCHED_BATCH)\r\n# define SCHED_BATCH 3\r\n#endif\r\n\r\n\/* the SCHED_IDLE is supported since Linux 2.6.23\r\n * commit id 0e6aca43e08a62a48d6770e9a159dbec167bf4c6\r\n * -- temporary workaround for people with old glibc headers\r\n *\/\r\n#if defined (__linux__) &amp;&amp; !defined(SCHED_IDLE)\r\n# define SCHED_IDLE 5\r\n#endif\r\n\r\n#if defined(__linux__) &amp;&amp; !defined(SCHED_RESET_ON_FORK)\r\n#define SCHED_RESET_ON_FORK 0x40000000\r\n#endif\r\n\r\n#define SCHED_GREEN 6\r\n\r\n#define ARRAY_SIZE(x) (sizeof(x) \/ sizeof((x)[0]))\r\n\r\nchar* _(char* s) {\r\n\treturn s;\r\n}\r\n\r\nlong strtol_or_err(const char *str, const char *errmesg)\r\n{\r\n\tlong num;\r\n\tchar *end = NULL;\r\n\r\n\tif (str != NULL &amp;&amp; *str != '\\0') {\r\n\t\terrno = 0;\r\n\t\tnum = strtol(str, &amp;end, 10);\r\n\t\tif (errno == 0 &amp;&amp; str != end &amp;&amp; end != NULL &amp;&amp; *end == '\\0')\r\n\t\t\treturn num;\r\n\t}\r\n\terror(EXIT_FAILURE, errno, \"%s: '%s'\", errmesg, str);\r\n\treturn 0;\r\n}\r\n\r\nstatic void __attribute__((__noreturn__)) show_usage(int rc)\r\n{\r\n\tFILE *out = rc == EXIT_SUCCESS ? stdout : stderr;\r\n\r\n\tfprintf(out, _(\r\n\t\"\\nchrt - manipulate real-time attributes of a process\\n\"\r\n\t\"\\nSet policy:\\n\"\r\n\t\"  chrt [options] &lt;policy&gt; &lt;priority&gt; {&lt;pid&gt; | &lt;command&gt; [&lt;arg&gt; ...]}\\n\"\r\n\t\"\\nGet policy:\\n\"\r\n\t\"  chrt [options] {&lt;pid&gt; | &lt;command&gt; [&lt;arg&gt; ...]}\\n\"));\r\n\r\n\tfprintf(out, _(\r\n\t\"\\nScheduling policies:\\n\"\r\n\t\"  -b | --batch         set policy to SCHED_BATCH\\n\"\r\n\t\"  -f | --fifo          set policy to SCHED_FIFO\\n\"\r\n\t\"  -i | --idle          set policy to SCHED_IDLE\\n\"\r\n\t\"  -o | --other         set policy to SCHED_OTHER\\n\"\r\n\t\"  -g | --green         set policy to SCHED_GREEN\\n\"\r\n\t\"  -r | --rr            set policy to SCHED_RR (default)\\n\"));\r\n\r\n#ifdef SCHED_RESET_ON_FORK\r\n\tfprintf(out, _(\r\n\t\"\\nScheduling flags:\\n\"\r\n\t\"  -R | --reset-on-fork set SCHED_RESET_ON_FORK for FIFO or RR\\n\"));\r\n#endif\r\n\tfprintf(out, _(\r\n\t\"\\nOptions:\\n\"\r\n\t\"  -h | --help          display this help\\n\"\r\n\t\"  -m | --max           show min and max valid priorities\\n\"\r\n\t\"  -p | --pid           operate on existing given pid\\n\"\r\n\t\"  -v | --verbose       display status information\\n\"\r\n\t\"  -V | --version       output version information\\n\\n\"));\r\n\r\n\texit(rc);\r\n}\r\n\r\nstatic void show_rt_info(pid_t pid, int isnew)\r\n{\r\n\tstruct sched_param sp;\r\n\tint policy;\r\n\r\n\t\/* don't display \"pid 0\" as that is confusing *\/\r\n\tif (!pid)\r\n\t\tpid = getpid();\r\n\r\n\tpolicy = sched_getscheduler(pid);\r\n\tif (policy == -1)\r\n\t\terr(EXIT_FAILURE, _(\"failed to get pid %d's policy\"), pid);\r\n\r\n\tif (isnew)\r\n\t\tprintf(_(\"pid %d's new scheduling policy: \"), pid);\r\n\telse\r\n\t\tprintf(_(\"pid %d's current scheduling policy: \"), pid);\r\n\r\n\tswitch (policy) {\r\n\tcase SCHED_OTHER:\r\n\t\tprintf(\"SCHED_OTHER\\n\");\r\n\t\tbreak;\r\n\tcase SCHED_FIFO:\r\n\t\tprintf(\"SCHED_FIFO\\n\");\r\n\t\tbreak;\r\n#ifdef SCHED_RESET_ON_FORK\r\n\tcase SCHED_FIFO|SCHED_RESET_ON_FORK:\r\n\t\tprintf(\"SCHED_FIFO|SCHED_RESET_ON_FORK\\n\");\r\n\t\tbreak;\r\n#endif\r\n#ifdef SCHED_IDLE\r\n\tcase SCHED_IDLE:\r\n\t\tprintf(\"SCHED_IDLE\\n\");\r\n\t\tbreak;\r\n#endif\r\n#ifdef SCHED_IDLE\r\n\tcase SCHED_GREEN:\r\n\t\tprintf(\"SCHED_GREEN\\n\");\r\n\t\tbreak;\r\n#endif\r\n\tcase SCHED_RR:\r\n\t\tprintf(\"SCHED_RR\\n\");\r\n\t\tbreak;\r\n#ifdef SCHED_RESET_ON_FORK\r\n\tcase SCHED_RR|SCHED_RESET_ON_FORK:\r\n\t\tprintf(\"SCHED_RR|SCHED_RESET_ON_FORK\\n\");\r\n\t\tbreak;\r\n#endif\r\n#ifdef SCHED_BATCH\r\n\tcase SCHED_BATCH:\r\n\t\tprintf(\"SCHED_BATCH\\n\");\r\n\t\tbreak;\r\n#endif\r\n\tdefault:\r\n\t\tprintf(_(\"unknown\\n\"));\r\n\t}\r\n\r\n\tif (sched_getparam(pid, &amp;sp))\r\n\t\terr(EXIT_FAILURE, _(\"failed to get pid %d's attributes\"), pid);\r\n\r\n\tif (isnew)\r\n\t\tprintf(_(\"pid %d's new scheduling priority: %d\\n\"),\r\n\t\t       pid, sp.sched_priority);\r\n\telse\r\n\t\tprintf(_(\"pid %d's current scheduling priority: %d\\n\"),\r\n\t\t       pid, sp.sched_priority);\r\n}\r\n\r\nstatic void show_min_max(void)\r\n{\r\n\tint i;\r\n\tint policies[] = { SCHED_OTHER, SCHED_FIFO, SCHED_RR,\r\n#ifdef SCHED_BATCH\r\n\t\t\t   SCHED_BATCH,\r\n#endif\r\n#ifdef SCHED_IDLE\r\n\t\t\t   SCHED_IDLE,\r\n#endif\r\n#ifdef SCHED_GREEN\r\n\t\t\t   SCHED_GREEN,\r\n#endif\r\n\t\t\t };\r\n\tconst char *names[] = { \"OTHER\", \"FIFO\", \"RR\",\r\n#ifdef SCHED_BATCH\r\n\t\t\t\t\"BATCH\",\r\n#endif\r\n#ifdef SCHED_IDLE\r\n\t\t\t\t\"IDLE\",\r\n#endif\r\n#ifdef SCHED_GREEN\r\n\t\t\t\t\"GREEN\",\r\n#endif\r\n\t\t\t      };\r\n\r\n\tfor (i = 0; i &lt; ARRAY_SIZE(policies); i++) {\r\n\t\tint max = sched_get_priority_max(policies[i]);\r\n\t\tint min = sched_get_priority_min(policies[i]);\r\n\r\n\t\tif (max &gt;= 0 &amp;&amp; min &gt;= 0)\r\n\t\t\tprintf(_(\"SCHED_%s min\/max priority\\t: %d\/%d\\n\"),\r\n\t\t\t\t\tnames[i], min, max);\r\n\t\telse\r\n\t\t\tprintf(_(\"SCHED_%s not supported?\\n\"), names[i]);\r\n\t}\r\n}\r\n\r\nint main(int argc, char *argv[])\r\n{\r\n\tint i, policy = SCHED_RR, priority = 0, verbose = 0, policy_flag = 0;\r\n\tstruct sched_param sp;\r\n\tpid_t pid = -1;\r\n\r\n\tstatic const struct option longopts[] = {\r\n\t\t{ \"batch\",\t0, NULL, 'b' },\r\n\t\t{ \"fifo\",\t0, NULL, 'f' },\r\n\t\t{ \"idle\",\t0, NULL, 'i' },\r\n\t\t{ \"pid\",\t0, NULL, 'p' },\r\n\t\t{ \"help\",\t0, NULL, 'h' },\r\n\t\t{ \"max\",        0, NULL, 'm' },\r\n\t\t{ \"other\",\t0, NULL, 'o' },\r\n\t\t{ \"rr\",\t\t0, NULL, 'r' },\r\n\t\t{ \"green\",\t\t0, NULL, 'g' },\r\n\t\t{ \"reset-on-fork\", 0, NULL, 'R' },\r\n\t\t{ \"verbose\",\t0, NULL, 'v' },\r\n\t\t{ \"version\",\t0, NULL, 'V' },\r\n\t\t{ NULL,\t\t0, NULL, 0 }\r\n\t};\r\n\r\n\twhile((i = getopt_long(argc, argv, \"+bfgiphmoRrvV\", longopts, NULL)) != -1)\r\n\t{\r\n\t\tint ret = EXIT_FAILURE;\r\n\r\n\t\tswitch (i) {\r\n\t\tcase 'b':\r\n#ifdef SCHED_BATCH\r\n\t\t\tpolicy = SCHED_BATCH;\r\n#endif\r\n\t\t\tbreak;\r\n\t\tcase 'f':\r\n\t\t\tpolicy = SCHED_FIFO;\r\n\t\t\tbreak;\r\n#ifdef SCHED_RESET_ON_FORK\r\n\t\tcase 'R':\r\n\t\t\tpolicy_flag |= SCHED_RESET_ON_FORK;\r\n\t\t\tbreak;\r\n#endif\r\n\t\tcase 'i':\r\n#ifdef SCHED_IDLE\r\n\t\t\tpolicy = SCHED_IDLE;\r\n#endif\r\n\t\t\tbreak;\r\n\t\tcase 'g':\r\n#ifdef SCHED_GREEN\r\n\t\t\tpolicy = SCHED_GREEN;\r\n#endif\r\n\t\t\tbreak;\r\n\t\tcase 'm':\r\n\t\t\tshow_min_max();\r\n\t\t\treturn 0;\r\n\t\tcase 'o':\r\n\t\t\tpolicy = SCHED_OTHER;\r\n\t\t\tbreak;\r\n\t\tcase 'p':\r\n\t\t\terrno = 0;\r\n\t\t\tpid = strtol_or_err(argv[argc - 1], _(\"failed to parse pid\"));\r\n\t\t\tbreak;\r\n\t\tcase 'r':\r\n\t\t\tpolicy = SCHED_RR;\r\n\t\t\tbreak;\r\n\t\tcase 'v':\r\n\t\t\tverbose = 1;\r\n\t\t\tbreak;\r\n\t\tcase 'V':\r\n\t\t\tprintf(\"chrt (%s)\\n\", PACKAGE_STRING);\r\n\t\t\treturn 0;\r\n\t\tcase 'h':\r\n\t\t\tret = EXIT_SUCCESS;\r\n\t\tdefault:\r\n\t\t\tshow_usage(ret);\r\n\t\t}\r\n\t}\r\n\r\n\tif (((pid &gt; -1) &amp;&amp; argc - optind &lt; 1) || ((pid == -1) &amp;&amp; argc - optind &lt; 2))\r\n\t\tshow_usage(EXIT_FAILURE);\r\n\r\n\tif ((pid &gt; -1) &amp;&amp; (verbose || argc - optind == 1)) {\r\n\t\tshow_rt_info(pid, FALSE);\r\n\t\tif (argc - optind == 1)\r\n\t\t\treturn EXIT_SUCCESS;\r\n\t}\r\n\r\n\terrno = 0;\r\n\tpriority = strtol_or_err(argv[optind], _(\"failed to parse priority\"));\r\n\r\n#ifdef SCHED_RESET_ON_FORK\r\n\t\/* sanity check *\/\r\n\tif ((policy_flag &amp; SCHED_RESET_ON_FORK) &amp;&amp;\r\n\t    !(policy == SCHED_FIFO || policy == SCHED_RR))\r\n\t\terrx(EXIT_FAILURE, _(\"SCHED_RESET_ON_FORK flag is suppoted for \"\r\n\t\t\t\t\"SCHED_FIFO and SCHED_RR policies only\"));\r\n#endif\r\n\r\n\tpolicy |= policy_flag;\r\n\r\n\tif (pid == -1)\r\n\t\tpid = 0;\r\n\tsp.sched_priority = priority;\r\n\tif (sched_setscheduler(pid, policy, &amp;sp) == -1)\r\n\t\terr(EXIT_FAILURE, _(\"failed to set pid %d's policy\"), pid);\r\n\r\n\tif (verbose)\r\n\t\tshow_rt_info(pid, TRUE);\r\n\r\n\tif (!pid) {\r\n\t\targv += optind + 1;\r\n\t\texecvp(argv[0], argv);\r\n\t\tprintf(\"FINIIISHED\\n\");\r\n\t\tperror(\"execvp\");\r\n\t\terr(EXIT_FAILURE, _(\"failed to execute %s\"), argv[0]);\r\n\t}\r\n\r\n\treturn EXIT_SUCCESS;\r\n}[\/code]<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>This is a modification of the program chrt (used to change the policy of a process) which has no external dependencies. It can be compiled using &#8220;gcc -o chrt chrt.c&#8221;. &nbsp; [code]\/* * chrt.c &#8211; chrt * Command-line utility for manipulating a task&#8217;s real-time attributes * * Robert Love &lt;rml@tech9.net&gt; * 27-Apr-2002: initial version * &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/perso.uclouvain.be\/tom.barbette\/standalone-version-of-chrt\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Standalone version of chrt&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-256","post","type-post","status-publish","format-standard","hentry","category-os2014"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Standalone version of chrt - Tom Barbette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perso.uclouvain.be\/tom.barbette\/standalone-version-of-chrt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Standalone version of chrt - Tom Barbette\" \/>\n<meta property=\"og:description\" content=\"This is a modification of the program chrt (used to change the policy of a process) which has no external dependencies. It can be compiled using &#8220;gcc -o chrt chrt.c&#8221;. &nbsp; [code]\/* * chrt.c - chrt * Command-line utility for manipulating a task&#039;s real-time attributes * * Robert Love &lt;rml@tech9.net&gt; * 27-Apr-2002: initial version * &hellip; Continue reading &quot;Standalone version of chrt&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/perso.uclouvain.be\/tom.barbette\/standalone-version-of-chrt\/\" \/>\n<meta property=\"og:site_name\" content=\"Tom Barbette\" \/>\n<meta property=\"article:published_time\" content=\"2014-03-27T09:44:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-02-12T12:48:27+00:00\" \/>\n<meta name=\"author\" content=\"Tom Barbette\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@TomBarbette\" \/>\n<meta name=\"twitter:site\" content=\"@TomBarbette\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tom Barbette\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/perso.uclouvain.be\\\/tom.barbette\\\/standalone-version-of-chrt\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/perso.uclouvain.be\\\/tom.barbette\\\/standalone-version-of-chrt\\\/\"},\"author\":{\"name\":\"Tom Barbette\",\"@id\":\"https:\\\/\\\/perso.uclouvain.be\\\/tom.barbette\\\/#\\\/schema\\\/person\\\/7f791766092e1207bc7a94a65e74f4fd\"},\"headline\":\"Standalone version of chrt\",\"datePublished\":\"2014-03-27T09:44:03+00:00\",\"dateModified\":\"2015-02-12T12:48:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/perso.uclouvain.be\\\/tom.barbette\\\/standalone-version-of-chrt\\\/\"},\"wordCount\":36,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/perso.uclouvain.be\\\/tom.barbette\\\/#organization\"},\"articleSection\":[\"INFO-0940 Operating Systems - 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