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use macro

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This commit is contained in:
fancy
2020-05-14 13:57:39 +08:00
parent 06ae0b9fc5
commit c0668fd8d2
1 changed files with 15 additions and 13 deletions
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28
cgattach.cpp
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@@ -10,6 +10,10 @@
#include <unistd.h>
using namespace std;
#define error(...) {fprintf(stderr, __VA_ARGS__);fprintf(stderr, "\n");}
#define debug(...) {fprintf(stdout, __VA_ARGS__);fprintf(stdout, "\n");}
void print_usage() { fprintf(stdout, "usage: cgattach <pid> <cgroup>\n"); }
bool exist(string path) {
@@ -26,7 +30,7 @@ bool validate(string pid, string cgroup) {
if (pid_v && cg_v)
return true;
fprintf(stderr, "paramater validate error\n");
error("paramater validate error");
print_usage();
exit(EXIT_FAILURE);
}
@@ -37,22 +41,21 @@ string get_cgroup2_mount_point(){
int count=fscanf(fp,"%s",&cgroup2_mount_point);
fclose(fp);
if (count=0){
fprintf(stderr, "cgroup2 not supported\n");
error("cgroup2 not supported");
exit(EXIT_FAILURE);
}
return cgroup2_mount_point;
}
int main(int argc, char *argv[]) {
setuid(0);
setgid(0);
if (getuid() != 0 || getgid() != 0) {
fprintf(stderr, "cgattach need suid sticky bit or run with root\n");
int flag=setuid(0);
if (flag!=0) {
perror("cgattach setuid");
exit(EXIT_FAILURE);
}
if (argc != 3) {
fprintf(stderr, "only need 2 paramaters\n");
error("only need 2 paramaters");
print_usage();
exit(EXIT_FAILURE);
}
@@ -69,20 +72,19 @@ int main(int argc, char *argv[]) {
if (!exist(cgroup_target_path)) {
if (mkdir(cgroup_target_path.c_str(),
S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == 0) {
fprintf(stdout, "created cgroup %s success\n", cgroup_target.c_str());
debug("created cgroup %s success", cgroup_target.c_str());
} else {
fprintf(stderr, "created cgroup %s failed, errno %d\n",
cgroup_target.c_str(), errno);
error("created cgroup %s failed, errno %d", cgroup_target.c_str(), errno);
exit(EXIT_FAILURE);
}
// fprintf(stderr, "cgroup %s not exist\n",cgroup_target.c_str());
// error("cgroup %s not exist",cgroup_target.c_str());
// exit(EXIT_FAILURE);
}
// put pid to target cgroup
ofstream procs(cgroup_target_procs, ofstream::app);
if (!procs.is_open()) {
fprintf(stderr, "open file %s failed\n", cgroup_target_procs.c_str());
error("open file %s failed", cgroup_target_procs.c_str());
exit(EXIT_FAILURE);
}
procs << pid.c_str() << endl;
@@ -90,7 +92,7 @@ int main(int argc, char *argv[]) {
// 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",
error("write %s to %s failed, maybe process %s not exist",
pid.c_str(), cgroup_target_procs.c_str(), pid.c_str());
exit(EXIT_FAILURE);
}