curl_easy_send.3 2.9 KB

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  24. .TH curl_easy_send 3 "29 April 2008" "libcurl 7.18.2" "libcurl Manual"
  25. .SH NAME
  26. curl_easy_send - sends raw data over an "easy" connection
  27. .SH SYNOPSIS
  28. .B #include <curl/easy.h>
  29. .sp
  30. .BI "CURLcode curl_easy_send( CURL *" curl ", const void *" buffer ","
  31. .BI " size_t " buflen ", size_t *" n ");"
  32. .ad
  33. .SH DESCRIPTION
  34. This function sends arbitrary data over the established connection. You may
  35. use it together with \fIcurl_easy_recv(3)\fP to implement custom protocols
  36. using libcurl. This functionality can be particularly useful if you use
  37. proxies and/or SSL encryption: libcurl will take care of proxy negotiation and
  38. connection set-up.
  39. \fBbuffer\fP is a pointer to the data of length \fBbuflen\fP that you want sent.
  40. The variable \fBn\fP points to will receive the number of sent bytes.
  41. To establish the connection, set \fBCURLOPT_CONNECT_ONLY\fP option before
  42. calling \fIcurl_easy_perform(3)\fP. Note that \fIcurl_easy_send(3)\fP will not
  43. work on connections that were created without this option.
  44. You must ensure that the socket is writable before calling
  45. \fIcurl_easy_send(3)\fP, otherwise the call will return \fBCURLE_AGAIN\fP -
  46. the socket is used in non-blocking mode internally. Use
  47. \fIcurl_easy_getinfo(3)\fP with \fBCURLINFO_LASTSOCKET\fP to obtain the
  48. socket; use your operating system facilities like \fIselect(2)\fP to check if
  49. it can be written to.
  50. .SH AVAILABILITY
  51. Added in 7.18.2.
  52. .SH RETURN VALUE
  53. On success, returns \fBCURLE_OK\fP and stores the number of bytes actually
  54. sent into \fB*n\fP. Note that this may very well be less than the amount you
  55. wanted to send.
  56. On failure, returns the appropriate error code.
  57. .SH EXAMPLE
  58. See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example.
  59. .SH "SEE ALSO"
  60. .BR curl_easy_setopt "(3), " curl_easy_perform "(3), " curl_easy_getinfo "(3), "
  61. .BR curl_easy_recv "(3) "