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POPermission denied when trying to write into log file
 

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  1. POPermission denied when trying to write into log file
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    <p>I have a problem writing into a log file in my C/C++ prog. Here's an example of the code where the problem occurs </p> <pre><code>EnterCriticalSection(&amp;critical); printf("\nWaiting for a connection on TCP port %d (nbr of current threads = %d)...\n", pServer-&gt;TCPServerPort, (*pServer-&gt;lChildInfo)); AddLog("Waiting for a connection on TCP port %d (nbr of current threads = %d)...", pServer-&gt;TCPServerPort, (*pServer-&gt;lChildInfo)); LeaveCriticalSection(&amp;critical); // creating variables to be passed to the thread struct*ThreadData = (struct*) malloc(sizeof(struct)); ThreadData-&gt;csock = (int*)malloc(sizeof(int)); memcpy(&amp;ThreadData-&gt;pServer,&amp;pServer,sizeof(pServer)); if((*ThreadData-&gt;csock = accept( pServer-&gt;ListenSocket, (SOCKADDR*)&amp;sadr, &amp;addr_size))!= INVALID_SOCKET ){ ThreadData-&gt;dwIP = sadr.sin_addr.s_addr; ThreadData-&gt;wPort = sadr.sin_port; printf("Received connection from %s:%d \n",inet_ntoa(sadr.sin_addr), ntohs(sadr.sin_port)); AddLog("Received connection from %s:%d ",inet_ntoa(sadr.sin_addr), ntohs(sadr.sin_port)); </code></pre> <p>AddLog is the function i wrote in order to write into the file : </p> <pre><code>FILE *fichier = NULL; va_list ap; va_start(ap, log); //fichier = fopen("log.log","a"); fichier = _fsopen("log.log", "a", SH_DENYNO); if (fichier == NULL) printf("Error log: %d (%s)\n", errno, strerror(errno)); else { fprintf(fichier,":"); vfprintf(fichier, log, ap); fprintf(fichier,"\n"); va_end(ap); fclose(fichier); } </code></pre> <p>What I can't really explain is that the first AddLog ("Waiting for...." and all the ones before..) are correctly written into the file. But when i try a connection, the logs coming then (received connection from...) are not written into the file and i always get the error 13 "Permission denied". I used chmod 777 into the file, i also tried _fsopen function and i still get this error once i enter into the thread. If someone have any idea it would be reaaally helpful. Thanks to all</p>
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    1. USalk
    1. USuser1336204
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      1. POPermission denied when trying to write into log file
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      1. VTUpMod
    1. COshow us the complete sample program and it may help find the problem.
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      1. POPermission denied when trying to write into log file
      1. USuser205993
    2. COSince your initial `AddLog()` call is guarded by a critical section, I suspect all other instances should be as well. Not sure if that's your problem or not, but it is *a* problem. Also, you probably should move the `va_start()` in `AddLog()` inside the `else` clause, as otherwise the matching `va_end()` may never get called - whether that's a problem may be implementation-dependent, though...
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      1. UStwalberg
 

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