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CURLOPT_DEBUGFUNCTION.3
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.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at http://curl.haxx.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" ************************************************************************** .\" .TH CURLOPT_DEBUGFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options" .SH NAME CURLOPT_DEBUGFUNCTION \- debug callback .SH SYNOPSIS .nf #include <curl/curl.h> typedef enum { CURLINFO_TEXT = 0, CURLINFO_HEADER_IN, /* 1 */ CURLINFO_HEADER_OUT, /* 2 */ CURLINFO_DATA_IN, /* 3 */ CURLINFO_DATA_OUT, /* 4 */ CURLINFO_SSL_DATA_IN, /* 5 */ CURLINFO_SSL_DATA_OUT, /* 6 */ CURLINFO_END } curl_infotype; int debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGFUNCTION, debug_callback); .SH DESCRIPTION Pass a pointer to your callback function, which should match the prototype shown above. \fICURLOPT_DEBUGFUNCTION(3)\fP replaces the standard debug function used when \fICURLOPT_VERBOSE(3)\fP is in effect. This callback receives debug information, as specified in the \fItype\fP argument. This function must return 0. The \fIdata\fP pointed to by the char * passed to this function WILL NOT be zero terminated, but will be exactly of the \fIsize\fP as told by the \fIsize\fP argument. The \fIuserptr\fP argument is the pointer set with \fICURLOPT_DEBUGDATA(3)\fP. Available curl_infotype values: .IP CURLINFO_TEXT The data is informational text. .IP CURLINFO_HEADER_IN The data is header (or header-like) data received from the peer. .IP CURLINFO_HEADER_OUT The data is header (or header-like) data sent to the peer. .IP CURLINFO_DATA_IN The data is protocol data received from the peer. .IP CURLINFO_DATA_OUT The data is protocol data sent to the peer. .IP CURLINFO_SSL_DATA_OUT The data is SSL/TLS (binary) data sent to the peer. .IP CURLINFO_SSL_DATA_IN The data is SSL/TLS (binary) data received from the peer. .SH DEFAULT NULL .SH PROTOCOLS All .SH EXAMPLE .nf static void dump(const char *text, FILE *stream, unsigned char *ptr, size_t size) { size_t i; size_t c; unsigned int width=0x10; fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\\n", text, (long)size, (long)size); for(i=0; i<size; i+= width) { fprintf(stream, "%4.4lx: ", (long)i); /* show hex to the left */ for(c = 0; c < width; c++) { if(i+c < size) fprintf(stream, "%02x ", ptr[i+c]); else fputs(" ", stream); } /* show data on the right */ for(c = 0; (c < width) && (i+c < size); c++) fputc(ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.', stream); fputc('\\n', stream); /* newline */ } } static int my_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp) { const char *text; (void)handle; /* prevent compiler warning */ switch (type) { case CURLINFO_TEXT: fprintf(stderr, "== Info: %s", data); default: /* in case a new one is introduced to shock us */ return 0; case CURLINFO_HEADER_OUT: text = "=> Send header"; break; case CURLINFO_DATA_OUT: text = "=> Send data"; break; case CURLINFO_SSL_DATA_OUT: text = "=> Send SSL data"; break; case CURLINFO_HEADER_IN: text = "<= Recv header"; break; case CURLINFO_DATA_IN: text = "<= Recv data"; break; case CURLINFO_SSL_DATA_IN: text = "<= Recv SSL data"; break; } dump(text, stderr, (unsigned char *)data, size); return 0; } int main(void) { CURL *curl; CURLcode res; curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace); /* the DEBUGFUNCTION has no effect until we enable VERBOSE */ curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); /* example.com is redirected, so we tell libcurl to follow redirection */ curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/"); res = curl_easy_perform(curl); /* Check for errors */ if(res != CURLE_OK) fprintf(stderr, "curl_easy_perform() failed: %s\\n", curl_easy_strerror(res)); /* always cleanup */ curl_easy_cleanup(curl); } return 0; } .fi .SH AVAILABILITY Always .SH RETURN VALUE Returns CURLE_OK .SH "SEE ALSO" .BR CURLOPT_VERBOSE "(3), " CURLOPT_DEBUGDATA "(3), "