On Wed, Apr 23, 2008 at 02:38:54AM -0700, Simun Mikecin wrote: > >Yes, it's supposed to segfault. Check out what, say, strcpy does if > >you ask it to copy a NULL pointer. And this is an improvement from the > >bad old days, when they would happily walk through memory starting at > >0..... > >Besides, errno is used to signal errors from system calls. strdup > >isn't a system call, it's a library function (says so at the top of > >the man page). > >Do you have examples of systems where strdup doesn't behave this way? > > According to Open Group strdup should return NULL and set errno. Look at: > http://www.opengroup.org/onlinepubs/009695399/functions/strdup.html > > There is no valid argument for doing segfault instead of above behavior.
No, the Open Group specification says the following in the System Interfaces -> 2.1 Use and Implementation of Functions: ### If an argument to a function has an invalid value (such as a value outside the domain of the function, or a pointer outside the address space of the program, or a null pointer), the behavior is undefined. ### Also, see my another answer with the proper incantation from the ANSI C standard.
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