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BIO_PRINTF(3) Library Functions Manual BIO_PRINTF(3)

BIO_printfformatted output to a BIO

/* -lcrypto */
#include <openssl/bio.h>

int
BIO_printf(BIO *bio, const char *format, ...);

() is a wrapper around vfprintf(3), sending the output to the specified bio.

These functions return the number of bytes written, or -1 if an error occurs.

BIO_new(3)

BIO_printf() first appeared in SSLeay 0.6.5 and has been available since OpenBSD 2.4.

June 8, 2025 OpenBSD-current