mongoose/docs/overview/build-options/tunables.md

---
title: Tunables
---

- `MG_MALLOC`, `MG_CALLOC`, `MG_REALLOC`, `MG_FREE` allow you to a use custom
  memory allocator, e.g. `-DMG_MALLOC=my_malloc`
- `MG_USE_READ_WRITE` when set replaces calls to `recv` with `read` and `send` with `write`,
  thus enabling to add any kind of file descriptor (files, serial devices) to an event manager.
- `MG_SSL_CRYPTO_MODERN`, `MG_SSL_CRYPTO_OLD` - choose either "Modern" or "Old" ciphers
  instead of the default "Intermediate" setting.
  See [this article](https://wiki.mozilla.org/Security/Server_Side_TLS#Recommended_configurations) for details.
- `MG_USER_FILE_FUNCTIONS` allow you to use custom file operation, by defining you own `mg_stat`, `mg_fopen`, `mg_open`, `mg_fread` and `mg_fwrite` functions
Remove old docs, rename docs_new to docs It would be probably good idea to also remove tools/docgen.py and asciidoc.mk, but asciidoc.mk is still mentioned under `cloud/doc`, which may contain some useful info which we'll need at least to review before removing. PUBLISHED_FROM=faf454d4c52a2f07ea8ac084cf0bd11a0c9c9b3b 2016-05-11 22:36:12 +02:00			`---`
			`title: Tunables`
			`---`

Add %T to the API ref PUBLISHED_FROM=f6679ea960b3aa0bc9142515548835ee0f78af67 2016-07-21 15:30:01 +01:00			- `MG_MALLOC`, `MG_CALLOC`, `MG_REALLOC`, `MG_FREE` allow you to a use custom
Remove old docs, rename docs_new to docs It would be probably good idea to also remove tools/docgen.py and asciidoc.mk, but asciidoc.mk is still mentioned under `cloud/doc`, which may contain some useful info which we'll need at least to review before removing. PUBLISHED_FROM=faf454d4c52a2f07ea8ac084cf0bd11a0c9c9b3b 2016-05-11 22:36:12 +02:00			memory allocator, e.g. `-DMG_MALLOC=my_malloc`
			- `MG_USE_READ_WRITE` when set replaces calls to `recv` with `read` and `send` with `write`,
			`thus enabling to add any kind of file descriptor (files, serial devices) to an event manager.`
			- `MG_SSL_CRYPTO_MODERN`, `MG_SSL_CRYPTO_OLD` - choose either "Modern" or "Old" ciphers
			`instead of the default "Intermediate" setting.`
			`See [this article](https://wiki.mozilla.org/Security/Server_Side_TLS#Recommended_configurations) for details.`
Add shims for mongoose file operations PUBLISHED_FROM=b5b12cdf4273f21dbcdac9bfb6a06063152914c9 2017-03-01 09:50:46 +00:00			- `MG_USER_FILE_FUNCTIONS` allow you to use custom file operation, by defining you own `mg_stat`, `mg_fopen`, `mg_open`, `mg_fread` and `mg_fwrite` functions