diff options
| -rw-r--r-- | src/port/win32stat.c | 66 |
1 files changed, 49 insertions, 17 deletions
diff --git a/src/port/win32stat.c b/src/port/win32stat.c index a3c42f0a96b..b79da738b29 100644 --- a/src/port/win32stat.c +++ b/src/port/win32stat.c @@ -257,34 +257,66 @@ int _pgfstat64(int fileno, struct stat *buf) { HANDLE hFile = (HANDLE) _get_osfhandle(fileno); - BY_HANDLE_FILE_INFORMATION fiData; + DWORD fileType = FILE_TYPE_UNKNOWN; + DWORD lastError; + unsigned short st_mode; - if (hFile == INVALID_HANDLE_VALUE || buf == NULL) + /* + * When stdin, stdout, and stderr aren't associated with a stream the + * special value -2 is returned: + * https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle + */ + if (hFile == INVALID_HANDLE_VALUE || hFile == (HANDLE) -2 || buf == NULL) { errno = EINVAL; return -1; } + fileType = GetFileType(hFile); + lastError = GetLastError(); + /* - * Check if the fileno is a data stream. If so, unless it has been - * redirected to a file, getting information through its HANDLE will fail, - * so emulate its stat information in the most appropriate way and return - * it instead. + * Invoke GetLastError in order to distinguish between a "valid" return of + * FILE_TYPE_UNKNOWN and its return due to a calling error. In case of + * success, GetLastError returns NO_ERROR. */ - if ((fileno == _fileno(stdin) || - fileno == _fileno(stdout) || - fileno == _fileno(stderr)) && - !GetFileInformationByHandle(hFile, &fiData)) + if (fileType == FILE_TYPE_UNKNOWN && lastError != NO_ERROR) + { + _dosmaperr(lastError); + return -1; + } + + switch (fileType) { - memset(buf, 0, sizeof(*buf)); - buf->st_mode = _S_IFCHR; - buf->st_dev = fileno; - buf->st_rdev = fileno; - buf->st_nlink = 1; - return 0; + /* The specified file is a disk file */ + case FILE_TYPE_DISK: + return fileinfo_to_stat(hFile, buf); + + /* + * The specified file is a socket, a named pipe, or an anonymous + * pipe. + */ + case FILE_TYPE_PIPE: + st_mode = _S_IFIFO; + break; + /* The specified file is a character file */ + case FILE_TYPE_CHAR: + st_mode = _S_IFCHR; + break; + /* Unused flag and unknown file type */ + case FILE_TYPE_REMOTE: + case FILE_TYPE_UNKNOWN: + default: + errno = EINVAL; + return -1; } - return fileinfo_to_stat(hFile, buf); + memset(buf, 0, sizeof(*buf)); + buf->st_mode = st_mode; + buf->st_dev = fileno; + buf->st_rdev = fileno; + buf->st_nlink = 1; + return 0; } #endif /* WIN32 */ |