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Full Discussion: Segmentation fault in C
Top Forums Programming Segmentation fault in C Post 302509341 by omega666 on Wednesday 30th of March 2011 02:34:04 PM
Old 03-30-2011
Quote:
Originally Posted by DGPickett
Well, assuming:
  1. NUM is the length of client_names
  2. all the client names entries are not null, pointers to valid addresses,
  3. every client name is null terminated,
  4. so is username (a valid pointer to a null terminated string)
then, nothing. Maybe test client_names[i] for null. Incidentally, argv is such an array of pointers to char arrays, and while main() provides argc, it is really derived by an extra argv entry at the end, a null pointer, as described in man 2 exec(). Sometimes, the null term is more reliable, like if NUM changes, as there is no Num needed. Stick in some fprintf(stderr,"%d: . . . ", __LINE__, . . .); lines and log what works, unbuffered.
i defined client_names like
char *client_names[NUM];
and only one element was defined
how do i set the ones i am not using to not null ?
 

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strncpy(9r)															       strncpy(9r)

NAME
strncpy - General: Copies a null-terminated character string with a specified limit SYNOPSIS
char * strncpy( char *s1, char *s2, int n ); ARGUMENTS
Specifies a pointer to a buffer of at least n bytes. Specifies a pointer to a string (an array of characters terminated by a null charac- ter). Specifies the number of characters to be copied. DESCRIPTION
The strncpy routine copies string s2 to buffer s1. The routine stops copying after it copies a null character or n characters, whichever comes first. If the length of s2 as determined by the null character is less than n, the routine pads s1 with null characters. RETURN VALUES
The strncpy routine returns a pointer to /NULL at the end of the first string (or to the location following the last copied character if there is no NULL). The copied string will not be null terminated if the length of s2 is n characters or more. SEE ALSO
Routines: bcopy(9r), blkclr(9r), copystr(9r), ovbcopy(9r), strcpy(9r) strncpy(9r)
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