memory/replace/logalloc/FdPrintf.h
author Andrew Halberstadt <ahal@mozilla.com>
Mon, 24 Jan 2022 08:57:18 +0000
changeset 605287 7e667b6a803df651804a554cb7e60e1f1bbce7c6
parent 552310 cf9ff6a1e749dbdc18e0e732af92c27792462174
permissions -rw-r--r--
Bug 1751474 - Vendor taskcluster-taskgraph==1.1.2 r=jcristau This picks up a bustage fix that occurs with Python 3.10. Differential Revision: https://phabricator.services.mozilla.com/D136690

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __FdPrintf_h__
#define __FdPrintf_h__

/* We can't use libc's (f)printf because it would reenter in replace_malloc,
 * So use a custom and simplified version.  Only %p, %zu, %s and %% are
 * supported, %zu, %s, support width specifiers.
 *
 * /!\ This function used a fixed-size internal buffer. The caller is
 * expected to not use a format string that may overflow.
 * The aFd argument is a file descriptor on UNIX and a native win32 file
 * handle on Windows (from CreateFile). We can't use the windows POSIX
 * APIs is that they don't support O_APPEND in a multi-process-safe way,
 * while CreateFile does.
 */
extern void FdPrintf(intptr_t aFd, const char* aFormat, ...)
#ifdef __GNUC__
    __attribute__((format(printf, 2, 3)))
#endif
    ;

#endif /* __FdPrintf_h__ */