4e238280bc
attempt to remove glide from integration glide trim Revert "attempt to remove glide from integration" This reverts commit c5b42b6cdebb44e730080a0cf20a871c11ef095b.
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
package system
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import (
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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)
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// look in /proc to find the process start time so that we can verify
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// that this pid has started after ourself
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func GetProcessStartTime(pid int) (string, error) {
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data, err := ioutil.ReadFile(filepath.Join("/proc", strconv.Itoa(pid), "stat"))
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if err != nil {
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return "", err
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}
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return parseStartTime(string(data))
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}
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func parseStartTime(stat string) (string, error) {
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// the starttime is located at pos 22
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// from the man page
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//
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// starttime %llu (was %lu before Linux 2.6)
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// (22) The time the process started after system boot. In kernels before Linux 2.6, this
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// value was expressed in jiffies. Since Linux 2.6, the value is expressed in clock ticks
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// (divide by sysconf(_SC_CLK_TCK)).
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//
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// NOTE:
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// pos 2 could contain space and is inside `(` and `)`:
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// (2) comm %s
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// The filename of the executable, in parentheses.
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// This is visible whether or not the executable is
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// swapped out.
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//
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// the following is an example:
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// 89653 (gunicorn: maste) S 89630 89653 89653 0 -1 4194560 29689 28896 0 3 146 32 76 19 20 0 1 0 2971844 52965376 3920 18446744073709551615 1 1 0 0 0 0 0 16781312 137447943 0 0 0 17 1 0 0 0 0 0 0 0 0 0 0 0 0 0
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// get parts after last `)`:
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s := strings.Split(stat, ")")
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parts := strings.Split(strings.TrimSpace(s[len(s)-1]), " ")
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return parts[22-3], nil // starts at 3 (after the filename pos `2`)
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}
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