curl.h

typedef struct {
  CURLversion age;          /* age of the returned struct */
  const char *version;      /* LIBCURL_VERSION */
  unsigned int version_num; /* LIBCURL_VERSION_NUM */
  const char *host;         /* OS/host/cpu/machine when configured */
  int features;             /* bitmask, see defines below */
  const char *ssl_version;  /* human readable string */
  long ssl_version_num;     /* not used anymore, always 0 */
  const char *libz_version; /* human readable string */
  /* protocols is terminated by an entry with a NULL protoname */
  const char * const *protocols;

  /* The fields below this were added in CURLVERSION_SECOND */
  const char *ares;
  int ares_num;

  /* This field was added in CURLVERSION_THIRD */
  const char *libidn;

  /* These field were added in CURLVERSION_FOURTH */

  /* Same as '_libiconv_version' if built with HAVE_ICONV */
  int iconv_ver_num;

  const char *libssh_version; /* human readable string */

} curl_version_info_data;

#define CURL_VERSION_IPV6      (1<<0)  /* IPv6-enabled */
#define CURL_VERSION_KERBEROS4 (1<<1)  /* kerberos auth is supported */
#define CURL_VERSION_SSL       (1<<2)  /* SSL options are present */
#define CURL_VERSION_LIBZ      (1<<3)  /* libz features are present */
#define CURL_VERSION_NTLM      (1<<4)  /* NTLM auth is supported */
#define CURL_VERSION_GSSNEGOTIATE (1<<5) /* Negotiate auth support */
#define CURL_VERSION_DEBUG     (1<<6)  /* built with debug capabilities */
#define CURL_VERSION_ASYNCHDNS (1<<7)  /* asynchronous dns resolves */
#define CURL_VERSION_SPNEGO    (1<<8)  /* SPNEGO auth */
#define CURL_VERSION_LARGEFILE (1<<9)  /* supports files bigger than 2GB */
#define CURL_VERSION_IDN       (1<<10) /* International Domain Names support */
#define CURL_VERSION_SSPI      (1<<11) /* SSPI is supported */
#define CURL_VERSION_CONV      (1<<12) /* character conversions supported */
#define CURL_VERSION_CURLDEBUG (1<<13) /* debug memory tracking supported */

/*
 * NAME curl_version_info()
 *
 * DESCRIPTION
 *
 * This function returns a pointer to a static copy of the version info
 * struct. See above.
 */
CURL_EXTERN curl_version_info_data *curl_version_info(CURLversion);

/*
 * NAME curl_easy_strerror()
 *
 * DESCRIPTION
 *
 * The curl_easy_strerror function may be used to turn a CURLcode value
 * into the equivalent human readable error string.  This is useful
 * for printing meaningful error messages.
 */
CURL_EXTERN const char *curl_easy_strerror(CURLcode);

/*
 * NAME curl_share_strerror()
 *
 * DESCRIPTION
 *
 * The curl_share_strerror function may be used to turn a CURLSHcode value
 * into the equivalent human readable error string.  This is useful
 * for printing meaningful error messages.
 */
CURL_EXTERN const char *curl_share_strerror(CURLSHcode);

/*
 * NAME curl_easy_pause()
 *
 * DESCRIPTION
 *
 * The curl_easy_pause function pauses or unpauses transfers. Select the new
 * state by setting the bitmask, use the convenience defines below.
 *
 */
CURL_EXTERN CURLcode curl_easy_pause(CURL *handle, int bitmask);

#define CURLPAUSE_RECV      (1<<0)
#define CURLPAUSE_RECV_CONT (0)

#define CURLPAUSE_SEND      (1<<2)
#define CURLPAUSE_SEND_CONT (0)

#define CURLPAUSE_ALL       (CURLPAUSE_RECV|CURLPAUSE_SEND)
#define CURLPAUSE_CONT      (CURLPAUSE_RECV_CONT|CURLPAUSE_SEND_CONT)

#ifdef  __cplusplus
}
#endif

/* unfortunately, the easy.h and multi.h include files need options and info
  stuff before they can be included! */
#include "easy.h" /* nothing in curl is fun without the easy stuff */
#include "multi.h"

/* the typechecker doesn't work in C++ (yet) */
#if defined(__GNUC__) && defined(__GNUC_MINOR__) && \
    ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && \
    !defined(__cplusplus) && !defined(CURL_DISABLE_TYPECHECK)
#include "typecheck-gcc.h"
#else
#if defined(__STDC__) && (__STDC__ >= 1)
/* This preprocessor magic that replaces a call with the exact same call is
   only done to make sure application authors pass exactly three arguments
   to these functions. */
#define curl_easy_setopt(handle,opt,param) curl_easy_setopt(handle,opt,param)
#define curl_easy_getinfo(handle,info,arg) curl_easy_getinfo(handle,info,arg)
#define curl_share_setopt(share,opt,param) curl_share_setopt(share,opt,param)
#define curl_multi_setopt(handle,opt,param) curl_multi_setopt(handle,opt,param)
#endif /* __STDC__ >= 1 */
#endif /* gcc >= 4.3 && !__cplusplus */

#endif /* __CURL_CURL_H */