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81 lines
1.4 KiB
81 lines
1.4 KiB
#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include "procfs.hpp"
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#include "errno.hpp"
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#include "fs_close.hpp"
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#include "fs_open.hpp"
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#include "fs_openat.hpp"
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#include "fs_read.hpp"
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#include "fmt/core.h"
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#include <array>
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#include <cassert>
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#include <pthread.h>
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static int g_PROCFS_DIR_FD = -1;
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namespace procfs { int PROC_SELF_FD_FD = -1; }
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static constexpr const char PROCFS_PATH[] = "/proc";
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static constexpr const char PROC_SELF_FD[] = "/proc/self/fd";
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// This is critical to the function of the app. abort if failed to
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// open.
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static
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void
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_open_proc_self_fd()
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{
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procfs::PROC_SELF_FD_FD = fs::open(PROC_SELF_FD,O_PATH|O_DIRECTORY);
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assert(procfs::PROC_SELF_FD_FD >= 0);
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}
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int
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procfs::init()
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{
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int rv;
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if(g_PROCFS_DIR_FD >= 0)
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return 0;
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rv = fs::open(PROCFS_PATH,O_PATH|O_DIRECTORY);
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if(rv < 0)
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return rv;
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g_PROCFS_DIR_FD = rv;
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#if defined(__linux__)
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::_open_proc_self_fd();
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#endif
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return 0;
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}
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std::string
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procfs::get_name(const int tid_)
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{
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int fd;
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int rv;
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std::array<char,256> commpath;
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fmt::format_to_n_result<char*> frv;
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frv = fmt::format_to_n(commpath.data(),commpath.size()-1,"{}/comm",tid_);
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frv.out[0] = '\0';
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fd = fs::openat(g_PROCFS_DIR_FD,commpath.data(),O_RDONLY);
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if(fd < 0)
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return {};
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rv = fs::read(fd,commpath.data(),commpath.size());
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if(rv < 0)
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return {};
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// Overwrite the newline with NUL
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commpath[rv-1] = '\0';
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fs::close(fd);
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return commpath.data();
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}
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