Get process path with pid using libproc.

ProcessUtil.m

#import <libproc.h>
#import <sys/proc_info.h>


@interface ProcessUtil : NSObject
  
+ (NSArray <NSNumber *> *)loadProcessIds;
+ (NSString *)pathWithPid:(int)pid;
@end
  
  
@implementation ProcessUtil
  
+ (NSArray <NSNumber *> *)loadProcessIds {
    int n = proc_listpids(PROC_ALL_PIDS, 0, NULL, 0);
    NSMutableArray *pidList = [NSMutableArray array];
    
    pid_t pids[n];
    bzero(pids, sizeof(pids));
    proc_listpids(PROC_ALL_PIDS, 0, pids, (int)sizeof(pids));
    for (int i = 0; i < n; ++i) {
        if (pids[i] == 0) { continue; }
        [pidList addObject:@(pids[i])];
    }
    return pidList;
}

+ (NSString *)pathWithPid:(int)pid {
    NSString *path = nil;
    char pathBuffer[PROC_PIDPATHINFO_MAXSIZE];
    bzero(pathBuffer, PROC_PIDPATHINFO_MAXSIZE);
    proc_pidpath(pid, pathBuffer, sizeof(pathBuffer));
    if (strlen(pathBuffer) > 0) {
        path = [NSString stringWithFormat:@"%s", pathBuffer];
    }
    return path;
}

@end