Glib and file manipulation

Hello, Im writting a font end for a webserver in GTK+ 2.This webserver has its config file in the format:
ServerRoot SomeValue
PidFile Path

Everything is fine, only that my function (void writeconf()) for changing the values, corrupts (sometimes and with only some variables which seem to be random) the servers config file. I have even tried to use this function without GTK and still doesnt work correctly.
Here is the URL for the file where the function is (I think its too long to type it here):

fileio.c
fileio.h
Thanks!

I can't get your code to even compile. I added the necessary includes even you .h but I get alot of errors

Code:

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In file included from fileio.c:24:
fileio.h:30: warning: no semicolon at end of struct or union
fileio.h:30: error: syntax error before '=' token
fileio.c: In function `write_config_file':
fileio.c:33: warning: implicit declaration of function `set_config_xml'
fileio.c: In function `create_dir':
fileio.c:43: warning: implicit declaration of function `mkdir'
fileio.c:43: error: `S_IRUSR' undeclared (first use in this function)
fileio.c:43: error: (Each undeclared identifier is reported only once
fileio.c:43: error: for each function it appears in.)
fileio.c:43: error: `S_IWUSR' undeclared (first use in this function)
fileio.c:43: error: `S_IXUSR' undeclared (first use in this function)
fileio.c: In function `get_config_xml':
fileio.c:98: error: `xmlDocPtr' undeclared (first use in this function)
fileio.c:98: error: syntax error before "doc"
fileio.c:99: error: `xmlNodePtr' undeclared (first use in this function)
fileio.c:102: error: `doc' undeclared (first use in this function)
fileio.c:102: warning: implicit declaration of function `xmlParseFile'
fileio.c:104: warning: implicit declaration of function `err_msg'
fileio.c:108: error: `cur' undeclared (first use in this function)
fileio.c:108: warning: implicit declaration of function `xmlDocGetRootElement'
fileio.c:111: warning: implicit declaration of function `xmlFreeDoc'
fileio.c:120: warning: implicit declaration of function `xmlGetProp'
fileio.c:120: error: syntax error before "xmlChar"
fileio.c:121: error: syntax error before "xmlChar"
fileio.c: In function `check_file':
fileio.c:155: error: storage size of `filestat' isn't known
fileio.c:157: warning: implicit declaration of function `stat'
fileio.c:155: warning: unused variable `filestat'
fileio.c: In function `readconf':
fileio.c:190: error: invalid application of `sizeof' to an incomplete type
fileio.c:197: error: dereferencing pointer to incomplete type
fileio.c:198: error: dereferencing pointer to incomplete type
fileio.c:202: warning: implicit declaration of function `err_quit'
fileio.c:205: error: dereferencing pointer to incomplete type
fileio.c:222: error: dereferencing pointer to incomplete type
fileio.c:225: error: dereferencing pointer to incomplete type
fileio.c:228: error: dereferencing pointer to incomplete type
fileio.c:230: error: dereferencing pointer to incomplete type
fileio.c:232: error: invalid application of `sizeof' to an incomplete type
fileio.c:233: error: dereferencing pointer to incomplete type
fileio.c:234: error: dereferencing pointer to incomplete type
fileio.c:235: error: dereferencing pointer to incomplete type
fileio.c:243: error: dereferencing pointer to incomplete type
fileio.c:245: error: dereferencing pointer to incomplete type
fileio.c:246: error: dereferencing pointer to incomplete type
fileio.c:256: error: dereferencing pointer to incomplete type
fileio.c:262: error: dereferencing pointer to incomplete type

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any luck fixing it yet?
oh and compiled with

Code:

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gcc -Wall -g fileio.c -o fileio `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0`

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