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/**
* Copyright (C) ARM Limited 2013-2014. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "Proc.h"
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Buffer.h"
#include "DynBuf.h"
#include "Logging.h"
struct ProcStat {
// From linux-dev/include/linux/sched.h
#define TASK_COMM_LEN 16
// TASK_COMM_LEN may grow, so be ready for it to get larger
char comm[2*TASK_COMM_LEN];
long numThreads;
};
static bool readProcStat(ProcStat *const ps, const char *const pathname, DynBuf *const b) {
if (!b->read(pathname)) {
logg->logMessage("%s(%s:%i): DynBuf::read failed, likely because the thread exited", __FUNCTION__, __FILE__, __LINE__);
// This is not a fatal error - the thread just doesn't exist any more
return true;
}
char *comm = strchr(b->getBuf(), '(');
if (comm == NULL) {
logg->logMessage("%s(%s:%i): parsing stat failed", __FUNCTION__, __FILE__, __LINE__);
return false;
}
++comm;
char *const str = strrchr(comm, ')');
if (str == NULL) {
logg->logMessage("%s(%s:%i): parsing stat failed", __FUNCTION__, __FILE__, __LINE__);
return false;
}
*str = '\0';
strncpy(ps->comm, comm, sizeof(ps->comm) - 1);
ps->comm[sizeof(ps->comm) - 1] = '\0';
const int count = sscanf(str + 2, " %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %ld", &ps->numThreads);
if (count != 1) {
logg->logMessage("%s(%s:%i): sscanf failed", __FUNCTION__, __FILE__, __LINE__);
return false;
}
return true;
}
static const char *readProcExe(DynBuf *const printb, const int pid, const int tid, DynBuf *const b) {
if (tid == -1 ? !printb->printf("/proc/%i/exe", pid)
: !printb->printf("/proc/%i/task/%i/exe", pid, tid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
return NULL;
}
const int err = b->readlink(printb->getBuf());
const char *image;
if (err == 0) {
image = strrchr(b->getBuf(), '/');
if (image == NULL) {
image = b->getBuf();
} else {
++image;
}
} else if (err == -ENOENT) {
// readlink /proc/[pid]/exe returns ENOENT for kernel threads
image = "\0";
} else {
logg->logMessage("%s(%s:%i): DynBuf::readlink failed", __FUNCTION__, __FILE__, __LINE__);
return NULL;
}
// Android apps are run by app_process but the cmdline is changed to reference the actual app name
if (strcmp(image, "app_process") != 0) {
return image;
}
if (tid == -1 ? !printb->printf("/proc/%i/cmdline", pid)
: !printb->printf("/proc/%i/task/%i/cmdline", pid, tid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
return NULL;
}
if (!b->read(printb->getBuf())) {
logg->logMessage("%s(%s:%i): DynBuf::read failed, likely because the thread exited", __FUNCTION__, __FILE__, __LINE__);
return NULL;
}
return b->getBuf();
}
static bool readProcTask(Buffer *const buffer, const int pid, DynBuf *const printb, DynBuf *const b1, DynBuf *const b2) {
bool result = false;
if (!b1->printf("/proc/%i/task", pid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
return result;
}
DIR *task = opendir(b1->getBuf());
if (task == NULL) {
logg->logMessage("%s(%s:%i): opendir failed", __FUNCTION__, __FILE__, __LINE__);
return result;
}
struct dirent *dirent;
while ((dirent = readdir(task)) != NULL) {
char *endptr;
const int tid = strtol(dirent->d_name, &endptr, 10);
if (*endptr != '\0') {
// Ignore task items that are not integers like ., etc...
continue;
}
if (!printb->printf("/proc/%i/task/%i/stat", pid, tid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
ProcStat ps;
if (!readProcStat(&ps, printb->getBuf(), b1)) {
logg->logMessage("%s(%s:%i): readProcStat failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
const char *const image = readProcExe(printb, pid, tid, b2);
if (image == NULL) {
logg->logMessage("%s(%s:%i): readImage failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
buffer->comm(pid, tid, image, ps.comm);
}
result = true;
fail:
closedir(task);
return result;
}
bool readProc(Buffer *const buffer, bool sendMaps, DynBuf *const printb, DynBuf *const b1, DynBuf *const b2, DynBuf *const b3) {
bool result = false;
DIR *proc = opendir("/proc");
if (proc == NULL) {
logg->logMessage("%s(%s:%i): opendir failed", __FUNCTION__, __FILE__, __LINE__);
return result;
}
struct dirent *dirent;
while ((dirent = readdir(proc)) != NULL) {
char *endptr;
const int pid = strtol(dirent->d_name, &endptr, 10);
if (*endptr != '\0') {
// Ignore proc items that are not integers like ., cpuinfo, etc...
continue;
}
if (!printb->printf("/proc/%i/stat", pid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
ProcStat ps;
if (!readProcStat(&ps, printb->getBuf(), b1)) {
logg->logMessage("%s(%s:%i): readProcStat failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
if (sendMaps) {
if (!printb->printf("/proc/%i/maps", pid)) {
logg->logMessage("%s(%s:%i): DynBuf::printf failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
if (!b2->read(printb->getBuf())) {
logg->logMessage("%s(%s:%i): DynBuf::read failed, likely because the process exited", __FUNCTION__, __FILE__, __LINE__);
// This is not a fatal error - the process just doesn't exist any more
continue;
}
buffer->maps(pid, pid, b2->getBuf());
}
if (ps.numThreads <= 1) {
const char *const image = readProcExe(printb, pid, -1, b1);
if (image == NULL) {
logg->logMessage("%s(%s:%i): readImage failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
buffer->comm(pid, pid, image, ps.comm);
} else {
if (!readProcTask(buffer, pid, printb, b1, b3)) {
logg->logMessage("%s(%s:%i): readProcTask failed", __FUNCTION__, __FILE__, __LINE__);
goto fail;
}
}
}
result = true;
fail:
closedir(proc);
return result;
}
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