解析ANDROID ps命令执行后各项参数的含义 .
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如何查看ANDROID进程信息呢?
可以打开Adb shell,然后我们就有2种方法:
方法1:直接输入ps命令
输入之后,我们就可以看到如下的信息:
- # ps
- ps
- USER PID PPID VSIZE RSS WCHAN PC NAME
- root 1 0 276 188 c0099f1c 000086e8 S /init
- root 2 0 0 0 c004df64 00000000 S kthreadd
- root 3 2 0 0 c003fa28 00000000 S ksoftirqd/0
- root 4 2 0 0 c004abc0 00000000 S events/0
- root 5 2 0 0 c004abc0 00000000 S khelper
- root 6 2 0 0 c004abc0 00000000 S suspend
- root 7 2 0 0 c004abc0 00000000 S kblockd/0
- root 8 2 0 0 c004abc0 00000000 S cqueue
- root 9 2 0 0 c01780d0 00000000 S kseriod
- root 10 2 0 0 c004abc0 00000000 S kmmcd
- root 11 2 0 0 c006efa8 00000000 S pdflush
- root 12 2 0 0 c006efa8 00000000 S pdflush
- root 13 2 0 0 c0073480 00000000 S kswapd0
- root 14 2 0 0 c004abc0 00000000 S aio/0
- root 22 2 0 0 c0175900 00000000 S mtdblockdc
# pspsUSER PID PPID VSIZE RSS WCHAN PC NAMEroot 1 0 276 188 c0099f1c 000086e8 S /initroot 2 0 0 0 c004df64 00000000 S kthreaddroot 3 2 0 0 c003fa28 00000000 S ksoftirqd/0root 4 2 0 0 c004abc0 00000000 S events/0root 5 2 0 0 c004abc0 00000000 S khelperroot 6 2 0 0 c004abc0 00000000 S suspendroot 7 2 0 0 c004abc0 00000000 S kblockd/0root 8 2 0 0 c004abc0 00000000 S cqueueroot 9 2 0 0 c01780d0 00000000 S kseriodroot 10 2 0 0 c004abc0 00000000 S kmmcdroot 11 2 0 0 c006efa8 00000000 S pdflushroot 12 2 0 0 c006efa8 00000000 S pdflushroot 13 2 0 0 c0073480 00000000 S kswapd0root 14 2 0 0 c004abc0 00000000 S aio/0root 22 2 0 0 c0175900 00000000 S mtdblockdc
那么我们禁不住要问:
USER PID PPID VSIZE RSS WCHAN PC NAME
那么这些项各代表着什么意思呢?
- USER: 进程的当前用户;
- PID : 毫无疑问, process ID的缩写,也就进程号;
- PPID :process parent ID,父进程ID
- VSIZE : virtual size,进程虚拟地址空间大小;
- RSS : 进程正在使用的物理内存的大小;
- WCHAN :进程如果处于休眠状态的话,在内核中的地址;
- PC : program counter,
- NAME: process name,进程的名称
android ps命令实现的源码
android下ps命令的源码的位置:android/system/core/toolbox/ps.c,其实现如下:
- int ps_main(int argc, char **argv)
- {
- DIR *d;
- struct dirent *de;
- char *namefilter = 0;
- int pidfilter = 0;
- int threads = 0;
- d = opendir("/proc");
- if(d == 0) return -1;
- while(argc > 1){
- if(!strcmp(argv[1],"-t")) {
- threads = 1;
- } else if(!strcmp(argv[1],"-x")) {
- display_flags |= SHOW_TIME;
- } else if(!strcmp(argv[1],"-p")) {
- display_flags |= SHOW_PRIO;
- } else if(isdigit(argv[1][0])){
- pidfilter = atoi(argv[1]);
- } else {
- namefilter = argv[1];
- }
- argc--;
- argv++;
- }
- printf("USER PID PPID VSIZE RSS %sWCHAN PC NAME\n",
- (display_flags&SHOW_PRIO)?"PRIO NICE RTPRI SCHED ":"");
- while((de = readdir(d)) != 0){
- if(isdigit(de->d_name[0])){
- int pid = atoi(de->d_name);
- if(!pidfilter || (pidfilter == pid)) {
- ps_line(pid, 0, namefilter);
- if(threads) ps_threads(pid, namefilter);
- }
- }
- }
- closedir(d);
- return 0;
- }
int ps_main(int argc, char **argv){ DIR *d; struct dirent *de; char *namefilter = 0; int pidfilter = 0; int threads = 0; d = opendir("/proc"); if(d == 0) return -1; while(argc > 1){ if(!strcmp(argv[1],"-t")) { threads = 1; } else if(!strcmp(argv[1],"-x")) { display_flags |= SHOW_TIME; } else if(!strcmp(argv[1],"-p")) { display_flags |= SHOW_PRIO; } else if(isdigit(argv[1][0])){ pidfilter = atoi(argv[1]); } else { namefilter = argv[1]; } argc--; argv++; } printf("USER PID PPID VSIZE RSS %sWCHAN PC NAME\n", (display_flags&SHOW_PRIO)?"PRIO NICE RTPRI SCHED ":""); while((de = readdir(d)) != 0){ if(isdigit(de->d_name[0])){ int pid = atoi(de->d_name); if(!pidfilter || (pidfilter == pid)) { ps_line(pid, 0, namefilter); if(threads) ps_threads(pid, namefilter); } } } closedir(d); return 0;}
我们可以得到每一行数据是如何获得的:
- static int ps_line(int pid, int tid, char *namefilter)
- {
- char statline[1024];
- char cmdline[1024];
- char user[32];
- struct stat stats;
- int fd, r;
- char *ptr, *name, *state;
- int ppid, tty;
- unsigned wchan, rss, vss, eip;
- unsigned utime, stime;
- int prio, nice, rtprio, sched;
- struct passwd *pw;
- sprintf(statline, "/proc/%d", pid);
- stat(statline, &stats);
- if(tid) {
- sprintf(statline, "/proc/%d/task/%d/stat", pid, tid);
- cmdline[0] = 0;
- } else {
- sprintf(statline, "/proc/%d/stat", pid);
- sprintf(cmdline, "/proc/%d/cmdline", pid);
- fd = open(cmdline, O_RDONLY);
- if(fd == 0) {
- r = 0;
- } else {
- r = read(fd, cmdline, 1023);
- close(fd);
- if(r < 0) r = 0;
- }
- cmdline[r] = 0;
- }
- fd = open(statline, O_RDONLY);
- if(fd == 0) return -1;
- r = read(fd, statline, 1023);
- close(fd);
- if(r < 0) return -1;
- statline[r] = 0;
- ptr = statline;
- nexttok(&ptr); // skip pid
- ptr++; // skip "("
- name = ptr;
- ptr = strrchr(ptr, ')'); // Skip to *last* occurence of ')',
- *ptr++ = '\0'; // and null-terminate name.
- ptr++; // skip " "
- state = nexttok(&ptr);
- ppid = atoi(nexttok(&ptr));
- nexttok(&ptr); // pgrp
- nexttok(&ptr); // sid
- tty = atoi(nexttok(&ptr));
- nexttok(&ptr); // tpgid
- nexttok(&ptr); // flags
- nexttok(&ptr); // minflt
- nexttok(&ptr); // cminflt
- nexttok(&ptr); // majflt
- nexttok(&ptr); // cmajflt
- #if 1
- utime = atoi(nexttok(&ptr));
- stime = atoi(nexttok(&ptr));
- #else
- nexttok(&ptr); // utime
- nexttok(&ptr); // stime
- #endif
- nexttok(&ptr); // cutime
- nexttok(&ptr); // cstime
- prio = atoi(nexttok(&ptr));
- nice = atoi(nexttok(&ptr));
- nexttok(&ptr); // threads
- nexttok(&ptr); // itrealvalue
- nexttok(&ptr); // starttime
- vss = strtoul(nexttok(&ptr), 0, 10); // vsize
- rss = strtoul(nexttok(&ptr), 0, 10); // rss
- nexttok(&ptr); // rlim
- nexttok(&ptr); // startcode
- nexttok(&ptr); // endcode
- nexttok(&ptr); // startstack
- nexttok(&ptr); // kstkesp
- eip = strtoul(nexttok(&ptr), 0, 10); // kstkeip
- nexttok(&ptr); // signal
- nexttok(&ptr); // blocked
- nexttok(&ptr); // sigignore
- nexttok(&ptr); // sigcatch
- wchan = strtoul(nexttok(&ptr), 0, 10); // wchan
- nexttok(&ptr); // nswap
- nexttok(&ptr); // cnswap
- nexttok(&ptr); // exit signal
- nexttok(&ptr); // processor
- rtprio = atoi(nexttok(&ptr)); // rt_priority
- sched = atoi(nexttok(&ptr)); // scheduling policy
- tty = atoi(nexttok(&ptr));
- if(tid != 0) {
- ppid = pid;
- pid = tid;
- }
- pw = getpwuid(stats.st_uid);
- if(pw == 0) {
- sprintf(user,"%d",(int)stats.st_uid);
- } else {
- strcpy(user,pw->pw_name);
- }
- if(!namefilter || !strncmp(name, namefilter, strlen(namefilter))) {
- printf("%-8s %-5d %-5d %-5d %-5d", user, pid, ppid, vss / 1024, rss * 4);
- if(display_flags&SHOW_PRIO)
- printf(" %-5d %-5d %-5d %-5d", prio, nice, rtprio, sched);
- printf(" %08x %08x %s %s", wchan, eip, state, cmdline[0] ? cmdline : name);
- if(display_flags&SHOW_TIME)
- printf(" (u:%d, s:%d)", utime, stime);
- printf("\n");
- }
- return 0;
- }
static int ps_line(int pid, int tid, char *namefilter){ char statline[1024]; char cmdline[1024]; char user[32]; struct stat stats; int fd, r; char *ptr, *name, *state; int ppid, tty; unsigned wchan, rss, vss, eip; unsigned utime, stime; int prio, nice, rtprio, sched; struct passwd *pw; sprintf(statline, "/proc/%d", pid); stat(statline, &stats); if(tid) { sprintf(statline, "/proc/%d/task/%d/stat", pid, tid); cmdline[0] = 0; } else { sprintf(statline, "/proc/%d/stat", pid); sprintf(cmdline, "/proc/%d/cmdline", pid); fd = open(cmdline, O_RDONLY); if(fd == 0) { r = 0; } else { r = read(fd, cmdline, 1023); close(fd); if(r < 0) r = 0; } cmdline[r] = 0; } fd = open(statline, O_RDONLY); if(fd == 0) return -1; r = read(fd, statline, 1023); close(fd); if(r < 0) return -1; statline[r] = 0; ptr = statline; nexttok(&ptr); // skip pid ptr++; // skip "(" name = ptr; ptr = strrchr(ptr, ')'); // Skip to *last* occurence of ')', *ptr++ = '\0'; // and null-terminate name. ptr++; // skip " " state = nexttok(&ptr); ppid = atoi(nexttok(&ptr)); nexttok(&ptr); // pgrp nexttok(&ptr); // sid tty = atoi(nexttok(&ptr)); nexttok(&ptr); // tpgid nexttok(&ptr); // flags nexttok(&ptr); // minflt nexttok(&ptr); // cminflt nexttok(&ptr); // majflt nexttok(&ptr); // cmajflt#if 1 utime = atoi(nexttok(&ptr)); stime = atoi(nexttok(&ptr));#else nexttok(&ptr); // utime nexttok(&ptr); // stime#endif nexttok(&ptr); // cutime nexttok(&ptr); // cstime prio = atoi(nexttok(&ptr)); nice = atoi(nexttok(&ptr)); nexttok(&ptr); // threads nexttok(&ptr); // itrealvalue nexttok(&ptr); // starttime vss = strtoul(nexttok(&ptr), 0, 10); // vsize rss = strtoul(nexttok(&ptr), 0, 10); // rss nexttok(&ptr); // rlim nexttok(&ptr); // startcode nexttok(&ptr); // endcode nexttok(&ptr); // startstack nexttok(&ptr); // kstkesp eip = strtoul(nexttok(&ptr), 0, 10); // kstkeip nexttok(&ptr); // signal nexttok(&ptr); // blocked nexttok(&ptr); // sigignore nexttok(&ptr); // sigcatch wchan = strtoul(nexttok(&ptr), 0, 10); // wchan nexttok(&ptr); // nswap nexttok(&ptr); // cnswap nexttok(&ptr); // exit signal nexttok(&ptr); // processor rtprio = atoi(nexttok(&ptr)); // rt_priority sched = atoi(nexttok(&ptr)); // scheduling policy tty = atoi(nexttok(&ptr)); if(tid != 0) { ppid = pid; pid = tid; } pw = getpwuid(stats.st_uid); if(pw == 0) { sprintf(user,"%d",(int)stats.st_uid); } else { strcpy(user,pw->pw_name); } if(!namefilter || !strncmp(name, namefilter, strlen(namefilter))) { printf("%-8s %-5d %-5d %-5d %-5d", user, pid, ppid, vss / 1024, rss * 4); if(display_flags&SHOW_PRIO) printf(" %-5d %-5d %-5d %-5d", prio, nice, rtprio, sched); printf(" %08x %08x %s %s", wchan, eip, state, cmdline[0] ? cmdline : name); if(display_flags&SHOW_TIME) printf(" (u:%d, s:%d)", utime, stime); printf("\n"); } return 0;}
方法2: 进入/proc文件夹
在/proc文件夹下有很多对应进程ID号的子文件夹:
- drwxr-xr-x 23 root root 4096 2012-10-01 02:09 ../
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 1/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 10/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1001/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1076/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 11/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 12/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 13/
- dr-xr-xr-x 7 gdm gdm 0 2013-01-25 21:11 1345/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1353/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1375/
- dr-xr-xr-x 7 root root 0 2013-01-25 21:10 14/
drwxr-xr-x 23 root root 4096 2012-10-01 02:09 ../dr-xr-xr-x 7 root root 0 2013-01-25 21:10 1/dr-xr-xr-x 7 root root 0 2013-01-25 21:10 10/dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1001/dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1076/dr-xr-xr-x 7 root root 0 2013-01-25 21:10 11/dr-xr-xr-x 7 root root 0 2013-01-25 21:10 12/dr-xr-xr-x 7 root root 0 2013-01-25 21:10 13/dr-xr-xr-x 7 gdm gdm 0 2013-01-25 21:11 1345/dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1353/dr-xr-xr-x 7 root root 0 2013-01-25 21:11 1375/dr-xr-xr-x 7 root root 0 2013-01-25 21:10 14/
我们可以进入对应的文件夹内,可以看到有以下信息,就可以查询到你的进程信息了。
(作者:LL 出处:http://blog.csdn.net/tcpipstack , 欢迎转载,也请保留这段声明。谢谢!)
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