Include linux/ext2_fs.h does not contain any ioctl definitions
anymore.
Request codes EXT2_IOC* have been replaced by FS_IOC* in
linux/fs.h.
Some definitions of FS_IOC_* use long* but the actual code expects
int* (see fs/ext2/ioctl.c).
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This behavior is implementation-defined by POSIX. If the name
doesn't start with a '/', glibc returns EINVAL without attempting
the syscall.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Clone has so many effects that it's an oversimplification to say
that the *main* use of clone is to create a thread. (In fact,
the use of clone() to create new processes may well be more
common, since glibc's fork() is a wrapper that calls clone().)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
An undocumented escape sequence in drivers/tty/vt/vt.c brings the
previously accessed virtual terminal to the foreground.
Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Normally, system calls return EINVAL for flags they don't support.
Explicitly document that clone does *not* produce an error for these two
obsolete flags.
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Since the initial implementation a lot more checks were added.
Describe all the checks would be too verbose (and would soon
fall out of date as more checks are added). So instead, describe
the kinds of checks that are done more generally.
Also a few other minor edits to the text.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
From email conversation with Konstantin:
> * Are you saying there are case where successful
> setsockopt() via nf_register_sockopt() might return a
> value other zero?
Yes - it happens when the option is served by a custom
netfilter hook (this is how I bumped into this). Example:
Userspace code:
=================== cut here ================================
int main(void) {
int sock;
if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
return -1;
return setsockopt(sock, IPPROTO_IP, TEST_SETSOCKOPT_RETURN, NULL, 0);
}
=================== cut here ================================
Kernel module, handling the option 400 "TEST_SETSOCKOPT_RETURN":
=================== cut here ================================
/* Random value - just should not be already used by the running
system: */
static int test_sock_set_so(struct sock *sk, int cmd, void *param,
unsigned len) {
return 42;
}
static struct nf_sockopt_ops test_sock_ops = {
list: {NULL, NULL},
pf: PF_INET,
set_optmin: TEST_SETSOCKOPT_RETURN,
set_optmax: (TEST_SETSOCKOPT_RETURN + 1),
set: test_sock_set_so,
get_optmin: 0,
get_optmax: 0,
get: NULL
};
static int test_sock_init(void) {
return nf_register_sockopt(&test_sock_ops); /* sanity check
skipped */
}
static void test_sock_exit(void) {
nf_unregister_sockopt(&test_sock_ops);
}
module_init(test_sock_init);
module_exit(test_sock_exit);
=================== cut here ================================
After successful loading of the module, the executable returns 42,
and as I understand, that is the intention of netfilter authors.
Netfilter code calls the registered handle and just returns back to
user what it receives from it.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Since the /proc/pid/attr API was added to the kernel, there
have been a couple of changes to the SELinux handling of
/proc/pid/attr/current. Fix the SELinux /proc/pid/attr/current
example text to reflect these changes and note which kernel
versions first included the changes.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
add FAT_IOCTL_GET_VOLUME_ID
SEE ALSO ioctl_fat.2
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Change "behaviour" to American spelling "behavior".
Signed-off-by: Bill Pemberton <wfp5p@worldbroken.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Ma Shimiao