Process::Process(pid_t pid)
{
//**************************************************
// Open and read /proc/<pid>/stat
// pid(%d) exe(%s) state(%c) ppid(%d)
m_pid = pid;
char fn[40];
sprintf(fn,"/proc/%d/stat",m_pid);
FILE* fp = fopen(fn,"r");
char* buf = NULL;
size_t sz = 0;
xalt_fgets_alloc(fp, &buf, &sz);
fclose(fp);
//**************************************************
// extract 2nd (exe) and 4th (ppid) fields from stat
char* p = strchr(buf,' ');
char* start = ++p;
if (*start == '(') start++;
p = strchr(p,' ');
int n = p - start - 1;
if (*p == ')') --n;
m_name.assign(start, n);
m_parent = (int) strtol(p+3, (char **) NULL, 10);
free(buf);
}
void Process::cmdline(std::vector<std::string>& cmdlineA)
{
char fn[40];
//**************************************************
// read command line from /proc/<pid>/cmdline
sprintf(fn,"/proc/%d/cmdline",m_pid);
FILE* fp = fopen(fn,"r");
char* buf = NULL;
size_t sz = 0;
xalt_fgets_alloc(fp, &buf, &sz);
fclose(fp);
char * p = buf;
while (*p)
{
cmdlineA.push_back(p);
p += strlen(p) + 1;
}
free(buf);
buf = NULL;
}
void parseProcMaps(pid_t pid, std::vector<Libpair>& libA, double& t_maps, double& t_sha1)
{
std::string path;
char * buf = NULL;
size_t sz = 0;
char * fn;
double t1 = epoch();
asprintf(&fn,"/proc/%d/maps",pid);
FILE* fp = fopen(fn,"r");
if (!fp) return;
Set soSet;
while(xalt_fgets_alloc(fp, &buf, &sz))
{
// Step a:
// find the start of the file name
char *p = strstr(buf," /");
if (p == NULL)
continue;
p += 4; // move to the leading slash
// Step b: Remove all lines that have "(deleted)" in them
const char *q = strstr(p,"(deleted)");
if (q)
continue;
// Step c: find the filename in the directory
q = strrchr(p,'/');
if (q == NULL)
continue;
// Step d: Find the .so in the file
const char * so = strstr(++q,".so");
if (so == NULL)
continue;
// Step e: make sure that any trailing chars are numbers or a period
so += 3;
size_t tail = strspn(so,"1234567890.");
if (0 < tail && tail < 2)
continue;
// Step f: remove libxalt_init.so
const char *xalt_so = strstr(q,"libxalt_init.so");
if (xalt_so)
continue;
path.assign(p);
soSet.insert(path);
}
for ( auto const & it : soSet)
argV.push_back(Arg(it));
long fnSzG = argV.size();
double t2 = epoch();
t_maps = t2 - t1;
compute_sha1_master(fnSzG); // compute sha1sum for all files.
for (long i = 0; i < fnSzG; ++i)
{
Libpair libpair(argV[i].fn, argV[i].sha1);
libA.push_back(libpair);
}
t_sha1 = epoch() - t2;
free(buf); sz = 0; buf = NULL;
fclose(fp);
}
