33 lines
721 B
C
33 lines
721 B
C
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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typedef long (*orig_sysconf_f_type)(int name);
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long sysconf(int name) {
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orig_sysconf_f_type orig;
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orig = (orig_sysconf_f_type)dlsym(RTLD_NEXT, "sysconf");
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if (name != _SC_NPROCESSORS_CONF && name != _SC_NPROCESSORS_ONLN) {
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return orig(name);
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}
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printf("Overriding call sysconf %d\n", name);
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long numcpus = 0;
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char *env = getenv("NUMCPUS");
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printf("Env NUMCPUS %s\n", env);
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if (env != NULL && strlen(env) > 0) {
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numcpus = strtol(env, NULL, 10);
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}
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if (numcpus == 0) {
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numcpus = orig(name);
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}
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printf("Return %ld\n", numcpus);
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fflush(stdout);
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return numcpus;
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}
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