SSL_SET_MAX_SEND_FRAGMENT(3) | Library Functions Manual | SSL_SET_MAX_SEND_FRAGMENT(3)

# NAME

`SSL_CTX_set_max_send_fragment`, `SSL_set_max_send_fragment` — control fragment sizes

# SYNOPSIS

library “libssl” libcrypto
`#include <openssl/ssl.h>`

long
`SSL_CTX_set_max_send_fragment`(SSL_CTX *ctx, long m);

long
`SSL_set_max_send_fragment`(SSL *ssl, long m);

# DESCRIPTION

`SSL_CTX_set_max_send_fragment`() and `SSL_set_max_send_fragment`() set the max_send_fragment parameter for SSL_CTX and SSL objects respectively. This value restricts the amount of plaintext bytes that will be sent in any one SSL/TLS record. By default its value is SSL3_RT_MAX_PLAIN_LENGTH (16384). These functions will only accept a value in the range 512 - SSL3_RT_MAX_PLAIN_LENGTH.

These functions are implemented using macros.

# RETURN VALUES

These functions return 1 on success or 0 on failure.

# SEE ALSO

ssl(3), SSL_ctrl(3), SSL_CTX_set_read_ahead(3), SSL_pending(3)

# HISTORY

`SSL_CTX_set_max_send_fragment`() and `SSL_set_max_send_fragment`() first appeared in OpenSSL 1.0.0 and have been available since OpenBSD 4.9.

June 8, 2025 | Debian