BIO_get_mem_ptr man page on MacOSX

Man page or keyword search:  
man Server   23457 pages
apropos Keyword Search (all sections)
Output format
MacOSX logo
[printable version]

BIO_s_mem(3)			    OpenSSL			  BIO_s_mem(3)

       BIO_s_mem, BIO_set_mem_eof_return, BIO_get_mem_data, BIO_set_mem_buf,
       BIO_get_mem_ptr, BIO_new_mem_buf - memory BIO

	#include <openssl/bio.h>

	BIO_METHOD *   BIO_s_mem(void);

	BIO_set_mem_eof_return(BIO *b,int v)
	long BIO_get_mem_data(BIO *b, char **pp)
	BIO_set_mem_buf(BIO *b,BUF_MEM *bm,int c)
	BIO_get_mem_ptr(BIO *b,BUF_MEM **pp)

	BIO *BIO_new_mem_buf(void *buf, int len);

       BIO_s_mem() return the memory BIO method function.

       A memory BIO is a source/sink BIO which uses memory for its I/O. Data
       written to a memory BIO is stored in a BUF_MEM structure which is
       extended as appropriate to accommodate the stored data.

       Any data written to a memory BIO can be recalled by reading from it.
       Unless the memory BIO is read only any data read from it is deleted
       from the BIO.

       Memory BIOs support BIO_gets() and BIO_puts().

       If the BIO_CLOSE flag is set when a memory BIO is freed then the
       underlying BUF_MEM structure is also freed.

       Calling BIO_reset() on a read write memory BIO clears any data in it.
       On a read only BIO it restores the BIO to its original state and the
       read only data can be read again.

       BIO_eof() is true if no data is in the BIO.

       BIO_ctrl_pending() returns the number of bytes currently stored.

       BIO_set_mem_eof_return() sets the behaviour of memory BIO b when it is
       empty. If the v is zero then an empty memory BIO will return EOF (that
       is it will return zero and BIO_should_retry(b) will be false. If v is
       non zero then it will return v when it is empty and it will set the
       read retry flag (that is BIO_read_retry(b) is true). To avoid ambiguity
       with a normal positive return value v should be set to a negative
       value, typically -1.

       BIO_get_mem_data() sets pp to a pointer to the start of the memory BIOs
       data and returns the total amount of data available. It is implemented
       as a macro.

       BIO_set_mem_buf() sets the internal BUF_MEM structure to bm and sets
       the close flag to c, that is c should be either BIO_CLOSE or
       BIO_NOCLOSE.  It is a macro.

       BIO_get_mem_ptr() places the underlying BUF_MEM structure in pp. It is
       a macro.

       BIO_new_mem_buf() creates a memory BIO using len bytes of data at buf,
       if len is -1 then the buf is assumed to be null terminated and its
       length is determined by strlen. The BIO is set to a read only state and
       as a result cannot be written to. This is useful when some data needs
       to be made available from a static area of memory in the form of a BIO.
       The supplied data is read directly from the supplied buffer: it is not
       copied first, so the supplied area of memory must be unchanged until
       the BIO is freed.

       Writes to memory BIOs will always succeed if memory is available: that
       is their size can grow indefinitely.

       Every read from a read write memory BIO will remove the data just read
       with an internal copy operation, if a BIO contains a lots of data and
       it is read in small chunks the operation can be very slow. The use of a
       read only memory BIO avoids this problem. If the BIO must be read write
       then adding a buffering BIO to the chain will speed up the process.

       There should be an option to set the maximum size of a memory BIO.

       There should be a way to "rewind" a read write BIO without destroying
       its contents.

       The copying operation should not occur after every small read of a
       large BIO to improve efficiency.

       Create a memory BIO and write some data to it:

	BIO *mem = BIO_new(BIO_s_mem());
	BIO_puts(mem, "Hello World\n");

       Create a read only memory BIO:

	char data[] = "Hello World";
	BIO *mem;
	mem = BIO_new_mem_buf(data, -1);

       Extract the BUF_MEM structure from a memory BIO and then free up the

	BUF_MEM *bptr;
	BIO_get_mem_ptr(mem, &bptr);
	BIO_set_close(mem, BIO_NOCLOSE); /* So BIO_free() leaves BUF_MEM alone */


50				  2013-03-05			  BIO_s_mem(3)

List of man pages available for MacOSX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net