Rich Felker
ea200e38bd
apparently these features have been in Linux for a while now, so it makes sense to support them. the bit twiddling seems utterly illogical and wasteful, especially the negation, but that's how the kernel folks chose to encode pids/tids into the clock id.
15 lines
283 B
C
15 lines
283 B
C
#include <time.h>
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#include <errno.h>
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#include <unistd.h>
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#include "syscall.h"
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int clock_getcpuclockid(pid_t pid, clockid_t *clk)
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{
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struct timespec ts;
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clockid_t id = (-pid-1)*8U + 2;
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int ret = __syscall(SYS_clock_getres, id, &ts);
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if (ret) return -ret;
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*clk = id;
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return 0;
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}
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