Created
March 6, 2015 14:43
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Using setlimit() system call to change limit of FD for a process. Copied from http://lzone.de/Debian%20Ubuntu%20ulimit%20Check%20List
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#define _GNU_SOURCE | |
#define _FILE_OFFSET_BITS 64 | |
#include <stdio.h> | |
#include <time.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sys/resource.h> | |
#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \ | |
} while (0) | |
int | |
main(int argc, char *argv[]) | |
{ | |
struct rlimit old, new; | |
struct rlimit *newp; | |
pid_t pid; | |
if (!(argc == 2 || argc == 4)) { | |
fprintf(stderr, "Usage: %s <pid> [<new-soft-limit> " | |
"<new-hard-limit>]\n", argv[0]); | |
exit(EXIT_FAILURE); | |
} | |
pid = atoi(argv[1]); /* PID of target process */ | |
newp = NULL; | |
if (argc == 4) { | |
new.rlim_cur = atoi(argv[2]); | |
new.rlim_max = atoi(argv[3]); | |
newp = &new; | |
} | |
if (prlimit(pid, RLIMIT_NOFILE, newp, &old) == -1) | |
errExit("prlimit-1"); | |
printf("Previous limits: soft=%lld; hard=%lld\n", | |
(long long) old.rlim_cur, (long long) old.rlim_max); | |
if (prlimit(pid, RLIMIT_NOFILE, NULL, &old) == -1) | |
errExit("prlimit-2"); | |
printf("New limits: soft=%lld; hard=%lld\n", | |
(long long) old.rlim_cur, (long long) old.rlim_max); | |
exit(EXIT_FAILURE); | |
} |
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