On my Mac, I have coded up a C cgi program. It works fine in Xcode, and from the Terminal, and when accessed by a html form under Safari and FireFox on the Mac. However, when I access the form on my home network, from my Windows XP machine running IE 6, it crashes when I click "submit" on my form.
Now, here's the tricky part: when it crashes, and IE displays the "Internal Server Error" page, if I click IE's REFRESH button, and click the RETRY popup to confirm resending the form data, the cgi program runs perfect and I get the output! This is blowing my mind!!
Here's the crash log:
And here's the C program. I'm assuming line 58 is the line where's crashing, so I've highlighted line 58 in red.Code:********** Host Name: todd-burchs-computer Date/Time: 2008-03-16 08:12:04.574 -0500 OS Version: 10.4.11 (Build 8S2167) Report Version: 4 Command: getmethod Path: /Library/WebServer/CGI-Executables/getmethod Parent: httpd [457] Version: ??? (???) PID: 3779 Thread: 0 Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_INVALID_ADDRESS (0x0001) at 0x7da5c33c Thread 0 Crashed: 0 getmethod 0x00008bba main + 688 (main.c:58) 1 getmethod 0x00001e9a start + 258 2 getmethod 0x00001dc1 start + 41 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x6f697462 ebx: 0x00008921 ecx: 0x00000000 edx: 0x00000000 edi: 0xbffff229 esi: 0x00008c91 ebp: 0xbffff358 esp: 0xbffff180 ss: 0x0000001f efl: 0x00010202 eip: 0x00008bba cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 Binary Images Description: 0x1000 - 0x4fff getmethod /Library/WebServer/CGI-Executables/getmethod 0x8000 - 0x8fff getmethod /Library/WebServer/CGI-Executables/getmethod 0x8fe00000 - 0x8fe4afff dyld 46.16 /usr/lib/dyld 0x90000000 - 0x90171fff libSystem.B.dylib /usr/lib/libSystem.B.dylib 0x901c1000 - 0x901c3fff libmathCommon.A.dylib /usr/lib/system/libmathCommon.A.dylib 0x90bd2000 - 0x90bd9fff libgcc_s.1.dylib /usr/lib/libgcc_s.1.dylib 0x963fa000 - 0x963fbfff com.apple.zerolink 1.2 (3) /System/Library/PrivateFrameworks/ZeroLink.framework/Versions/A/ZeroLink
Any ideas? If you want me to post the html form, I can do that.Code:#include <stdio.h> #include <string.h> #include <stdlib.h> //int main (int argc, const char * argv[]) { int main (int argc, char * const argv[], char * envp[] ) { int i ; char * position , * envptr ; char buffer[256] ; char * ctype ; int clength = 0 ; char const * names[] = { "CONTENT_LENGTH" , "CONTENT_TYPE" , "DOCUMENT_ROOT" , "HTTP_ACCEPT" , "HTTP_ACCEPT_ENCODING" , "HTTP_ACCEPT_LANGUAGE" , "HTTP_CONNECTION" , "HTTP_HOST" , "HTTP_REFERER" , "HTTP_USER_AGENT" , "PATH" , "REMOTE_ADDR" , "REMOTE_PORT" , "SCRIPT_FILENAME" , "SCRIPT_URI" , "SCRIPT_URL", "SERVER_ADDR" , "SERVER_ADMIN" , "SERVER_NAME" , "SERVER_PORT" , "SERVER_SIGNATURE" , "SERVER_SOFTWARE" , "GATEWAY_INTERFACE" , "SERVER_PROTOCOL" , "REQUEST_METHOD" , "QUERY_STRING" , "REQUEST_URI" , "SCRIPT_NAME" , NULL } ; printf("Content-Type: text/html\n\n") ; printf("<html>\n") ; printf("<head><title>From A C Program</title>\n") ; printf("<style type='text/css'>\n") ; printf(".yellow { background-color: yellow ; border: 1px solid black ;}\n") ; printf("</style>\n") ; printf("</head>\n") ; printf("<body><p>Hi there</p>\n") ; printf("<table class='yellow'>\n") ; i = 0 ; while( names[i] != NULL ) { // this is line 58 printf("<tr><td>\n") ; printf("\t%-30s\n", names[i] ) ; printf("</td><td>\n") ; strcpy(buffer,names[i]) ; strcat(buffer,"=") ; envptr = getenv(names[i]) ; if (envptr) strcat(buffer, envptr) ; else strcat(buffer, "(null)") ; position = strchr(buffer, '=') ; buffer[position-buffer] = 0 ; // null term the environment variable name printf("\t%s\n", position+1) ; if (strcmp("CONTENT_TYPE",buffer)==0) { ctype = position+1 ; } if (strcmp("CONTENT_LENGTH",buffer)==0) { clength = atoi(position+1) ; } printf("</td></tr>\n") ; i++ ; } printf("</table>\n"); printf("<table frame='box' rules='all' cellpadding='5' >\n<tr><td>data... bytes = %d</td>\n<td>", clength ); for ( i = 0 ; i < clength ; ++i ) { char c = fgetc(stdin) ; if (c=='\n') printf("<br />") ; else printf( "%c", c ) ; } printf("</td>\n</tr>\n") ; printf("</table>\n</body>\n"); printf("</html>\n"); fflush(stdout) ; return 0; }
Thanks, Todd
Originally Posted by Adak
