nagios4/lib/nsock.h

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#ifndef LIBNAGIOS_NSOCK_H_INCLUDED
#define LIBNAGIOS_NSOCK_H_INCLUDED
#include <errno.h>
/**
* @file nsock.h
* @brief Nagios socket helper library
*
* This is a pretty stupid library, but since so many addons and
* now Nagios core itself makes use of sockets, we might as well
* have some simple wrappers for it that handle the most common
* cases.
*
* @{
*/
#define NSOCK_EBIND (-1) /**< failed to bind() */
#define NSOCK_ELISTEN (-2) /**< failed to listen() */
#define NSOCK_ESOCKET (-3) /**< failed to socket() */
#define NSOCK_EUNLINK (-4) /**< failed to unlink() */
#define NSOCK_ECONNECT (-5) /**< failed to connect() */
#define NSOCK_EFCNTL (-6) /**< failed to fcntl() */
#define NSOCK_EINVAL (-EINVAL) /**< -22, normally */
/* flags for the various create calls */
#define NSOCK_TCP (1 << 0) /**< use tcp mode */
#define NSOCK_UDP (1 << 1) /**< use udp mode */
#define NSOCK_UNLINK (1 << 2) /**< unlink existing path (only nsock_unix) */
#define NSOCK_REUSE (1 << 2) /**< reuse existing address */
#define NSOCK_CONNECT (1 << 3) /**< connect rather than create */
#define NSOCK_BLOCK (1 << 4) /**< socket should be in blocking mode */
/**
* Grab an error string relating to nsock_unix()
* @param code The error code return by the nsock library
* @return An error string describing the error
*/
extern const char *nsock_strerror(int code);
/**
* Create or connect to a unix socket
* To control permissions on sockets when NSOCK_LISTEN is specified,
* callers will have to modify their umask() before (and possibly
* after) the nsock_unix() call.
*
* @param path The path to connect to or create
* @param flags Various options controlling the mode of the socket
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* @return An NSOCK_E macro on errors, the created socket on success
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*/
extern int nsock_unix(const char *path, unsigned int flags);
/**
* Write a nul-terminated message to the socket pointed to by sd.
* This isn't quite the same as dprintf(), which doesn't include
* the terminating nul byte.
* @note This function may block, so poll(2) for writability
* @param sd The socket to write to
* @param fmt The format string
* @return Whatever write() returns
*/
extern int nsock_printf_nul(int sd, const char *fmt, ...)
__attribute__((__format__(__printf__, 2, 3)));
/**
* Write a printf()-formatted string to the socket pointed to by sd.
* This is identical to dprintf(), which is unfortunately GNU only.
* @note This function may block, so poll(2) for writability
* @param sd The socket to write to
* @param fmt The format string
* @return Whatever write() returns
*/
extern int nsock_printf(int sd, const char *fmt, ...)
__attribute__((__format__(__printf__, 2, 3)));
/** @} */
#endif /* LIBNAGIOS_NSOCK_H_INCLUDED */