ios7 进程查看差劲 iphone如何查看进程

通过调用 sys/sysctl.h 读取系统内核获取进程列表 。

{

//指定名字参数，按照顺序第一个元素指定本请求定向到内核的哪个子系统，第二个及其后元素依次细化指定该系统的某个部分。
//CTL_KERN，KERN_PROC,KERN_PROC_ALL 正在运行的所有进程
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL ,0};
size_t miblen = 4;
//值-结果参数：函数被调用时，size指向的值指定该缓冲区的大小；函数返回时，该值给出内核存放在该缓冲区中的数据量
//如果这个缓冲不够大，函数就返回ENOMEM错误
size_t size;
//返回0，成功；返回-1，失败
int st = sysctl(mib, miblen, NULL, &size, NULL, 0);  
 
struct kinfo_proc * process = NULL;
struct kinfo_proc * newprocess = NULL;
do
{
size += size / 10;
newprocess = realloc(process, size);
if (!newprocess)
{
if (process)
{
free(process);
process = NULL;
}
return nil;
}
process = newprocess;
st = sysctl(mib, miblen, process, &size, NULL, 0);
 
} 
while (st == -1 && errno == ENOMEM);
if (st == 0)
{       
if (size % sizeof(struct kinfo_proc) == 0)
{
int nprocess = size / sizeof(struct kinfo_proc);
if (nprocess)
{               
NSMutableArray * array = [[NSMutableArray alloc] init];
for (int i = nprocess - 1; i >= 0; i--)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSString * processID = [[NSString alloc] initWithFormat:@"%d", process[i].kp_proc.p_pid];
NSString * processName = [[NSString alloc] initWithFormat:@"%s", process[i].kp_proc.p_comm];
NSString * proc_CPU = [[NSString alloc] initWithFormat:@"%d", process[i].kp_proc.p_pctcpu];
 
//the process duration
//double t = [[NSDate date] timeIntervalSince1970] - process[i].kp_proc.p_un.__p_starttime.tv_sec;
 
NSString * proc_useTiem = [[NSString alloc] initWithFormat:@"%s",asctime(localtime(&(process[i].kp_proc.p_un.__p_starttime.tv_sec)))];                    
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
[dic setValue:processID forKey:@"ProcessID"];
[dic setValue:processName forKey:@"ProcessName"];
[dic setValue:proc_CPU forKey:@"ProcessCPU"];
[dic setValue:proc_useTiem forKey:@"ProcessUseTime"];
 
[processID release];
[processName release];
[proc_CPU release];
[proc_useTiem release];
[array addObject:dic];
[dic release];
[pool release];
 
}
free(process);
process = NULL;
return array;
 
}
}
}
return nil;
}