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//
// mslutil.c
// mslutil
//
// Created by Christopher Deppe on 3/31/17.
//
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/sysctl.h>
#include <stack_logging.h>
#define BSD_PID_MAX 99999 /* Copy of PID_MAX from sys/proc_internal.h. */
static void print_usage()
{
printf("usage: mslutil pid [--disable] | [--enable malloc | vm | full | lite | vmlite]\n");
}
static int send_msl_command(uint64_t pid, uint64_t flavor)
{
uint64_t flags = flavor;
flags <<= 32;
flags |= (pid & 0xFFFFFFFF);
int ret = sysctlbyname("kern.memorystatus_vm_pressure_send", 0, 0, &flags, sizeof(flags));
if (ret) {
printf("send_msl_command - sysctl: kern.memorystatus_vm_pressure_send failed %s\n", strerror(errno));
} else {
printf("send_msl_command - success!\n");
}
return ret;
}
int main(int argc, const char * argv[])
{
if (argc < 3) {
print_usage();
exit(1);
}
int ret = -1;
pid_t pid = atoi(argv[1]);
if (pid <= 0 || pid > BSD_PID_MAX) {
printf("Invalid pid\n");
exit(1);
}
if (strcmp(argv[2], "--enable") == 0) {
if (argc < 4) {
print_usage();
exit(1);
}
uint64_t flavor = 0;
if (strcmp(argv[3], "full") == 0) {
flavor = MEMORYSTATUS_ENABLE_MSL_MALLOC | MEMORYSTATUS_ENABLE_MSL_VM;
} else if (strcmp(argv[3], "malloc") == 0) {
flavor = MEMORYSTATUS_ENABLE_MSL_MALLOC;
} else if (strcmp(argv[3], "vm") == 0) {
flavor = MEMORYSTATUS_ENABLE_MSL_VM;
} else if (strcmp(argv[3], "lite") == 0) {
flavor = MEMORYSTATUS_ENABLE_MSL_LITE_FULL;
} else if (strcmp(argv[3], "vmlite") == 0) {
flavor = MEMORYSTATUS_ENABLE_MSL_LITE_VM;
}
if (flavor == 0) {
print_usage();
exit(1);
}
ret = send_msl_command(pid, flavor);
} else if (strcmp(argv[2], "--disable") == 0) {
ret = send_msl_command(pid, MEMORYSTATUS_DISABLE_MSL);
} else {
print_usage();
exit(1);
}
if (ret != 0) {
exit(1);
} else {
exit(0);
}
}
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