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Full Discussion: C code : Segmentation fault
Top Forums Programming C code : Segmentation fault Post 302492414 by Corona688 on Monday 31st of January 2011 10:15:38 AM
Old 01-31-2011
What is your system?

What is your compiler?

In gcc/linux, compile with -ggdb and run with gdb ./a.out, then type 'run', and when it crashes, type 'bt full' to show where it crashed.

Also: Listen to the warnings the compiler gives you. to wit:

Code:
definitions.h:10: warning: 'SRC_DIR' initialized and declared 'extern'
definitions.h:11: warning: 'LOG_DIR' initialized and declared 'extern'
definitions.h:12: warning: 'TMP_DIR' initialized and declared 'extern'
definitions.h:13: warning: 'ARCH_DIR' initialized and declared 'extern'
definitions.h:16: warning: 'LOG_NAME' initialized and declared 'extern'
definitions.h:17: warning: 'FIELD_SEP' initialized and declared 'extern'
definitions.h:18: warning: 'LOG_EXT' initialized and declared 'extern'
definitions.h:19: warning: 'TMP_EXT' initialized and declared 'extern'
definitions.h:20: warning: 'TRG_EXT' initialized and declared 'extern'
definitions.h:21: warning: 'ARCH_EXT' initialized and declared 'extern'
definitions.h:22: warning: 'DIR_SEP' initialized and declared 'extern'
port.c: In function 'main':
port.c:80: warning: format '%s' expects type 'char *', but argument 2 has type 'char **'
port.c:14: warning: unused variable 'target_stream'

header files don't work that way, and extern doesn't work that way. You either want to do

Code:
#define SRC_DIR "/home/hhulaman/1516/source/"

or
Code:
extern char * SRC_DIR;

with an accompanying
Code:
#include "definitions.h"
char *SRC_DIR="/home/hhulaman/1516/source/";

in definitions.c. This prevents the variable from being redefined 19 times if it's included in 19 seperate C files.

Better yet, make them constant, so you can't overwrite them accidentally:
Code:
extern const char const * SRC_DIR;

Last edited by Corona688; 01-31-2011 at 11:22 AM..
 

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