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Diffstat (limited to 'src/slack.c')
| -rw-r--r-- | src/slack.c | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/src/slack.c b/src/slack.c deleted file mode 100644 index 1895e50..0000000 --- a/src/slack.c +++ /dev/null @@ -1,136 +0,0 @@ -/** - * slack — Spawn processes with customised timer slack - * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/prctl.h> - - - -#define NS (1L) -#define US (1000L) -#define MS (1000L * 1000L) -#define S (1000L * 1000L * 1000L) - - -static void usage(void) -{ - printf("USAGE: slack (get | GET | ((reset | <interval>) [--fatal] [--] <command...>))\n"); - printf("\n"); - printf("The <interval> must be a positive number optionally with a suffix:\n"); - printf(" ns n nanoseconds (default)\n"); - printf(" µs µ us u microseconds\n"); - printf(" ms m milliseconds\n"); - printf(" s seconds\n"); - printf("\n"); - printf("If `GET' is used rather than `get', the timer slack value will be printed in\n"); - printf("nanoseconds without suffix. `GET' and `get' prints the current timer slack\n"); - printf("value and exits.\n"); - printf("\n"); - printf("`reset` reset the timer slack value to the default (the time slack value for\n"); - printf("the init process (PID 1) has.)\n"); - printf("\n"); - printf("Unless `--fatal` is used, the program will run <command> even if the timer\n"); - printf("slack could not be set.\n"); - printf("\n"); -} - - -int main(int argc, char** argv) -{ - long slackvalue, r; - int i, j, fatal = 0; - char** exec_argv; - - if ((argc < 2) || !strcmp(argv[1], "--help") || !strcmp(argv[1], "help")) - return usage(), argc < 2 ? 1 : 0; - - if (!strcmp(argv[1], "get") || !strcmp(argv[1], "GET")) - { - const char* suffix; - if (r = prctl(PR_GET_TIMERSLACK), r < 0) - perror(*argv); - else - { - if (!strcmp(argv[1], "GET")) - suffix = ""; - else if (r % S == 0) suffix = "s", r /= S; - else if (r % MS == 0) suffix = "ms", r /= MS; - else if (r % US == 0) suffix = "µs", r /= US; - else suffix = "ns"; - printf("%li%s\n", r, suffix); - } - return r > 0 ? 0 : 1; - } - - for (i = 2; i < argc; i++) - if (!strcmp(argv[i], "--fatal")) - fatal = 1; - else if (!strcmp(argv[i], "--")) - { - i++; - break; - } - else if (strstr(argv[i], "-") == argv[i]) - return usage(), 1; - else - break; - - if (i == argc) - return usage(), 1; - - exec_argv = malloc((argc - i + 1) * sizeof(char*)); - if (exec_argv == NULL) - return perror(*argv), 2; - exec_argv[argc - i] = NULL; - for (j = 0; i < argc; j++, i++) - exec_argv[j] = argv[i]; - - if (!strcmp(argv[1], "reset")) - slackvalue = 0; - else - { - char* end; - - slackvalue = strtol(argv[1], &end, 10); - if (end == argv[1]) - return fprintf(stderr, "No slack value specified."), free(exec_argv), 1; - - if (!strcmp(end, "n") || !strcmp(end, "ns") || !strcmp(end, "")) slackvalue *= NS; - else if (!strcmp(end, "µ") || !strcmp(end, "µs")) slackvalue *= US; - else if (!strcmp(end, "u") || !strcmp(end, "us")) slackvalue *= US; - else if (!strcmp(end, "m") || !strcmp(end, "ms")) slackvalue *= MS; - else if (!strcmp(end, "s")) slackvalue *= S; - else - return fprintf(stderr, "Unrecognised suffix for slack value."), free(exec_argv), 1; - - if (slackvalue <= 0) - return fprintf(stderr, "Invalid slack value: %lins", slackvalue), free(exec_argv), 1; - } - - if (r = prctl(PR_SET_TIMERSLACK, slackvalue), r < 0) - if (perror(*argv), fatal) - return free(exec_argv), 2; - - execvp(*exec_argv, exec_argv); - perror(*argv); - free(exec_argv); - return 2; -} - |