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Full Discussion: C. To segmentation fault or not to segmentation fault, that is the question.
Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032356 by Corona688 on Friday 15th of March 2019 02:31:43 PM
Old 03-15-2019
It crashes when you overrun the end of argv[].

Code:
int main(int argc, char *argv[])
{
    int NUM_1 = strtod(argv[1], NULL); // Does argv[1] exist?  If not, crash.
    int NUM_2 = strtod(argv[3], NULL); // Does argv[3] exist?  If not, crash.
    CHARACTER = *argv[2]; // Does argv[2] exist?  If not, crash.

    /* Conditional AFTER _variables_! */
    if (argc <= 3)
    {
        printf("ERROR!\n\n");
        printf("Not enough arguments!\n");
        exit(1);
    }

    printf("\n%i, %i, %c\n\n", NUM_1, NUM_2, CHARACTER);

    return(0);
}

The system is actually supposed to crash when you do this, rather than let you get away with mangling data outside of bounds, but some systems are better at catching it than others.
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LEARN ABOUT OPENSOLARIS

uucopy

uucopy(2)							   System Calls 							 uucopy(2)

NAME

       uucopy - no-fault memory-to-memory copy

SYNOPSIS

       #include <strings.h>

       int uucopy(const void *s1, void *s2, size_t n);

DESCRIPTION

       The uucopy() function copies n bytes from memory area s1 to s2.	Copying  between objects that overlap could corrupt one or both buffers.

       Unlike  bcopy(3C),  uucopy()  does  not	cause a segmentation fault if either the source or destination buffer includes an illegal address.
       Instead, it returns -1 and sets errno to EFAULT. This error could occur after the operation has partially completed, so the contents of the
       buffer at s2 are defined if the operation fails.

RETURN VALUES

       Upon successful completion, uucopy() returns 0.	Otherwise, the function returns -1 and	set errno to indicate the error.

ERRORS

       The uucopy() function will fail if:

       EFAULT	 Either the s1 or s2 arguments points to an illegal address.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bcopy(3C), attributes(5)

SunOS 5.11							    12 Sep 2006 							 uucopy(2)
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