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UNIX for Dummies Questions & Answers
What's the difference between Segmentation fault and Bus error and Illegal...?
Post 302179655 by lakeat on Friday 28th of March 2008 09:25:14 AM
03-28-2008
Quote:
Segmentation Fault (also known as SIGSEGV and is usually signal 11) - You can get this message when the program tries to write/read outside the memory allocated for it or when writing memory which can only be read
Bus Error (also known as SIGBUS and is usually signal 10) - You can encounter this signal error when an invalid pointer is dereferenced i.e when you try to dereference an uninitialised pointer. It is similar to SIGSEGV but the difference is that SIGSEGV indicates an invalid access to valid memory, while SIGBUS indicates an access to an invalid address.
Illegal Instructions (also known as SIGILL and is usually signal 4) - This usually means that your program is trying to execute garbage or a privileged instruction. You might encounter this -
(a.) when you try to execute data
(b.) when you try to execute a corrupted executed file.
(c.) stack overflows
(d.) when the system has trouble running the handler for a signal
HTH
Bus Error (also known as SIGBUS and is usually signal 10) - You can encounter this signal error when an invalid pointer is dereferenced i.e when you try to dereference an uninitialised pointer. It is similar to SIGSEGV but the difference is that SIGSEGV indicates an invalid access to valid memory, while SIGBUS indicates an access to an invalid address.
Illegal Instructions (also known as SIGILL and is usually signal 4) - This usually means that your program is trying to execute garbage or a privileged instruction. You might encounter this -
(a.) when you try to execute data
(b.) when you try to execute a corrupted executed file.
(c.) stack overflows
(d.) when the system has trouble running the handler for a signal
HTH
I wonder is there any good book on unix or linux debugging?
Could anybody recommend one?
Daniel
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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)