diff options
Diffstat (limited to 'src/io.h')
-rw-r--r-- | src/io.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/io.h b/src/io.h new file mode 100644 index 0000000..87778ec --- /dev/null +++ b/src/io.h @@ -0,0 +1,61 @@ +#ifndef CHANGE_IO_H_ +#define CHANGE_IO_H_ + +#include <unistd.h> +#include <dlfcn.h> +#include <fcntl.h> +#include <sys/stat.h> + +#include <cstring> + +namespace io { + +class FileDescriptorGuard { + public: + FileDescriptorGuard(const std::string& path) { + this->fd = open(path.c_str(), O_WRONLY | O_APPEND); + + if ( !this->fd ) { + this->fd = STDERR_FILENO; + } + } + + ~FileDescriptorGuard() { + close(this->fd); + } + + operator int() { + return this->fd; + } + + private: + int fd; + +}; + +std::string get_file_name(int fd) { + char proc_link[20]; + char file_name[256]; + + snprintf(proc_link, sizeof(proc_link), "/proc/self/fd/%d", fd); + const ssize_t name_size = readlink(proc_link, file_name, sizeof(file_name)); + + if ( name_size > 0 ) { + file_name[name_size] = '\0'; + + return std::string(file_name); + } else { + return std::string(); + } +} + +bool is_regular_file(int fd) { + struct stat fd_stat; + fstat(fd, &fd_stat); + + return S_ISREG(fd_stat.st_mode); +} + +} + +#endif // CHANGE_IO_H_ |