Prints the name of all the parent processes of this process.

parentprocess.m

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

// http://www.objectpark.net/en/parentpid.html
pid_t OPParentIDForProcessID(pid_t pid)
{
    struct kinfo_proc info;
    size_t length = sizeof(struct kinfo_proc);
    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, pid };
    if (sysctl(mib, 4, &info, &length, NULL, 0) < 0)
        return 0;
    if (length == 0)
        return 0;
    return info.kp_eproc.e_ppid;
}

// http://stackoverflow.com/questions/3018054/retrieve-names-of-running-processes
NSString *nameForPid(pid_t pid)
{
	char name[PROC_PIDPATHINFO_MAXSIZE] = "unknown";
	proc_pidpath(pid, name, sizeof(name));
	return [[NSString stringWithUTF8String:name] lastPathComponent];
}


int main(int argc, const char * argv[])
{

	@autoreleasepool {
		pid_t pid = getpid();
		int indentDepth = 0;
		while(pid != 0) {
			NSMutableString *indent = [NSMutableString new];
			for(int i = 1; i < indentDepth; i++)
				[indent appendString:@"   "];
			if(indentDepth != 0)
				[indent appendString:@"└─ "];
			printf("%sProcess[%d]: %s\n", [indent UTF8String], pid, [nameForPid(pid) UTF8String]);
			pid = OPParentIDForProcessID(pid);
			indentDepth++;
		}
	}
    return 0;
}