Date: Mon, 26 May 2008 20:14:38 +0300 From: Krassimir Slavchev <krassi@bulinfo.net> To: FreeBSD <freebsd-stable@freebsd.org> Subject: shmat() return values? Message-ID: <483AEFFE.8080302@bulinfo.net>
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Hello,
When I try:
if ((*shm = shmat(shmid, NULL, 0)) == -1)
The gcc complains with:
warning: comparison between pointer and integer
shmat() is declared in shm.h as:
void *shmat(int, const void *, int);
but 'man 4 shmat;
RETURN VALUES
Upon success, shmat() returns the address where the segment is
attached;
otherwise, -1 is returned and errno is set to indicate the error.
What is the correct return value on failure, -1 or NULL?
I think it should be NULL?
Best Regards
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