mirror of https://gitee.com/openkylin/linux.git
39 lines
738 B
C
39 lines
738 B
C
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#ifndef __BPF_UTIL__
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#define __BPF_UTIL__
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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static inline unsigned int bpf_num_possible_cpus(void)
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{
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static const char *fcpu = "/sys/devices/system/cpu/possible";
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unsigned int start, end, possible_cpus = 0;
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char buff[128];
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FILE *fp;
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fp = fopen(fcpu, "r");
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if (!fp) {
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printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
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exit(1);
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}
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while (fgets(buff, sizeof(buff), fp)) {
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if (sscanf(buff, "%u-%u", &start, &end) == 2) {
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possible_cpus = start == 0 ? end + 1 : 0;
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break;
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}
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}
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fclose(fp);
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if (!possible_cpus) {
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printf("Failed to retrieve # possible CPUs!\n");
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exit(1);
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}
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return possible_cpus;
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}
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#endif /* __BPF_UTIL__ */
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