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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "procfs_get_name.hpp"
#include "errno.hpp"
#include "fs_close.hpp"
#include "fs_open.hpp"
#include "fs_openat.hpp"
#include "fs_read.hpp"
#include <pthread.h>
static int g_PROCFS_DIR_FD = -1;
const char PROCFS_PATH[] = "/proc";
int
procfs::init()
{
if(g_PROCFS_DIR_FD != -1)
return 0;
g_PROCFS_DIR_FD = fs::open(PROCFS_PATH,O_PATH|O_DIRECTORY);
if(g_PROCFS_DIR_FD == -1)
return -errno;
return 0;
}
std::string
procfs::get_name(const int tid_)
{
int fd;
int rv;
char commpath[256];
snprintf(commpath,sizeof(commpath),"%d/comm",tid_);
fd = fs::openat(g_PROCFS_DIR_FD,commpath,O_RDONLY);
if(fd < 0)
return {};
rv = fs::read(fd,commpath,sizeof(commpath));
if(rv == -1)
return {};
// Overwrite the newline with NUL
commpath[rv-1] = '\0';
fs::close(fd);
return commpath;
}