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sdk: read procfs instead of using sysctl command 

This drops the dependency of sysctl command
This commit is contained in:
Shengjing Zhu 2020-10-25 00:36:13 +08:00
parent c7c5aaa609
commit 403e1e2534
1 changed files with 4 additions and 5 deletions
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9
sdk/freeport/ephemeral_linux.go
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@ -4,18 +4,17 @@ package freeport
import (
"fmt"
"os/exec"
"io/ioutil"
"regexp"
"strconv"
)
const ephemeralPortRangeSysctlKey = "net.ipv4.ip_local_port_range"
const ephemeralPortRangeProcFile = "/proc/sys/net/ipv4/ip_local_port_range"
var ephemeralPortRangePatt = regexp.MustCompile(`^\s*(\d+)\s+(\d+)\s*$`)
func getEphemeralPortRange() (int, int, error) {
cmd := exec.Command("/sbin/sysctl", "-n", ephemeralPortRangeSysctlKey)
out, err := cmd.Output()
out, err := ioutil.ReadFile(ephemeralPortRangeProcFile)
if err != nil {
return 0, 0, err
}
@ -32,5 +31,5 @@ func getEphemeralPortRange() (int, int, error) {
}
}
return 0, 0, fmt.Errorf("unexpected sysctl value %q for key %q", val, ephemeralPortRangeSysctlKey)
return 0, 0, fmt.Errorf("unexpected sysctl value %q for key %q", val, ephemeralPortRangeProcFile)
}