mirror of https://github.com/trapexit/mergerfs.git
55 lines
885 B
C++
55 lines
885 B
C++
#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include "procfs_get_name.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 <pthread.h>
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static int g_PROCFS_DIR_FD = -1;
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const char PROCFS_PATH[] = "/proc";
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int
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procfs::init()
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{
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if(g_PROCFS_DIR_FD != -1)
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return 0;
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g_PROCFS_DIR_FD = fs::open(PROCFS_PATH,O_PATH|O_DIRECTORY);
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if(g_PROCFS_DIR_FD == -1)
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return -errno;
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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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char commpath[256];
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snprintf(commpath,sizeof(commpath),"%d/comm",tid_);
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fd = fs::openat(g_PROCFS_DIR_FD,commpath,O_RDONLY);
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if(fd < 0)
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return {};
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rv = fs::read(fd,commpath,sizeof(commpath));
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if(rv == -1)
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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;
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}
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