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updated readme

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fancy
2020-04-24 02:11:44 +08:00
parent 7d76a9742b
commit ce7990d26a
2 changed files with 12 additions and 9 deletions
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14
cgattach.cpp
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@@ -10,7 +10,7 @@
#include <unistd.h>
using namespace std;
void print_usage() { fprintf(stderr, "usage: cgattach <pid> <cgroup>\n"); }
void print_usage() { fprintf(stdout, "usage: cgattach <pid> <cgroup>\n"); }
bool exist(string path) {
struct stat st;
@@ -25,8 +25,8 @@ bool validate(string pid, string cgroup) {
bool cg_v = regex_match(cgroup, regex("^\\/[a-zA-Z0-9\\-_./@]*$"));
if (pid_v && cg_v)
return true;
// cout<<pid_v<<" "<<cg_v<<endl;
puts("paramater validate error\n");
fprintf(stderr, "paramater validate error\n");
print_usage();
exit(EXIT_FAILURE);
}
@@ -35,12 +35,12 @@ int main(int argc, char *argv[]) {
setuid(0);
setgid(0);
if (getuid() != 0 || getgid() != 0) {
fprintf(stderr, "cgattach need setuid sticky bit\n");
fprintf(stderr, "cgattach need suid sticky bit or run with root\n");
exit(EXIT_FAILURE);
}
if (argc != 3) {
puts("only need 2 paramaters\n");
fprintf(stderr, "only need 2 paramaters\n");
print_usage();
exit(EXIT_FAILURE);
}
@@ -52,7 +52,7 @@ int main(int argc, char *argv[]) {
string cgroup_target_path = cgroup_mount_point + cgroup_target;
string cgroup_target_procs = cgroup_target_path + "/cgroup.procs";
// check if exist, we won't create it if not exist
// check if exist, we will create it if not exist
if (!exist(cgroup_target_path)) {
if (mkdir(cgroup_target_path.c_str(),
S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == 0) {
@@ -75,7 +75,7 @@ int main(int argc, char *argv[]) {
procs << pid.c_str() << endl;
procs.close();
// maybe there some write error, for example process pid not exist
// maybe there some write error, for example process pid may not exist
if (!procs) {
fprintf(stderr, "write %s to %s failed, maybe process %s not exist\n",
pid.c_str(), cgroup_target_procs.c_str(), pid.c_str());