/* $OpenBSD: linux_misc.c,v 1.60 2007/02/06 18:42:37 art Exp $ */
/* $NetBSD: linux_misc.c,v 1.27 1996/05/20 01:59:21 fvdl Exp $ */
/*-
* Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
* of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Linux compatibility module. Try to deal with various Linux system calls.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/unistd.h>
#include <sys/syscallargs.h>
#include <uvm/uvm_extern.h>
#include <compat/linux/linux_types.h>
#include <compat/linux/linux_fcntl.h>
#include <compat/linux/linux_misc.h>
#include <compat/linux/linux_mmap.h>
#include <compat/linux/linux_sched.h>
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_dirent.h>
#include <compat/linux/linux_emuldata.h>
#include <compat/common/compat_dir.h>
/* linux_misc.c */
static void bsd_to_linux_statfs(struct statfs *, struct linux_statfs *);
int linux_select1(struct proc *, register_t *, int, fd_set *,
fd_set *, fd_set *, struct timeval *);
static int getdents_common(struct proc *, void *, register_t *, int);
static void linux_to_bsd_mmap_args(struct sys_mmap_args *,
const struct linux_sys_mmap2_args *);
/*
* The information on a terminated (or stopped) process needs
* to be converted in order for Linux binaries to get a valid signal
* number out of it.
*/
void
bsd_to_linux_wstat(status)
int *status;
{
if (WIFSIGNALED(*status))
*status = (*status & ~0177) |
bsd_to_linux_sig[WTERMSIG(*status)];
else if (WIFSTOPPED(*status))
*status = (*status & ~0xff00) |
(bsd_to_linux_sig[WSTOPSIG(*status)] << 8);
}
/*
* waitpid(2). Just forward on to linux_sys_wait4 with a NULL rusage.
*/
int
linux_sys_waitpid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_waitpid_args /* {
syscallarg(int) pid;
syscallarg(int *) status;
syscallarg(int) options;
} */ *uap = v;
struct sys_wait4_args linux_w4a;
SCARG(&linux_w4a, pid) = SCARG(uap, pid);
SCARG(&linux_w4a, status) = SCARG(uap, status);
SCARG(&linux_w4a, options) = SCARG(uap, options);
SCARG(&linux_w4a, rusage) = NULL;
return (linux_sys_wait4(p, &linux_w4a, retval));
}
/*
* wait4(2). Passed on to the OpenBSD call, surrounded by code to reserve
* some space for an OpenBSD-style wait status, and converting it to what
* Linux wants.
*/
int
linux_sys_wait4(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_wait4_args /* {
syscallarg(int) pid;
syscallarg(int *) status;
syscallarg(int) options;
syscallarg(struct rusage *) rusage;
} */ *uap = v;
struct sys_wait4_args w4a;
int error, *status, tstat, linux_options, options;
caddr_t sg;
if (SCARG(uap, status) != NULL) {
sg = stackgap_init(p->p_emul);
status = (int *) stackgap_alloc(&sg, sizeof status);
} else
status = NULL;
linux_options = SCARG(uap, options);
options = 0;
if (linux_options &
~(LINUX_WAIT4_WNOHANG|LINUX_WAIT4_WUNTRACED|LINUX_WAIT4_WCLONE))
return (EINVAL);
if (linux_options & LINUX_WAIT4_WNOHANG)
options |= WNOHANG;
if (linux_options & LINUX_WAIT4_WUNTRACED)
options |= WUNTRACED;
if (linux_options & LINUX_WAIT4_WCLONE)
options |= WALTSIG;
SCARG(&w4a, pid) = SCARG(uap, pid);
SCARG(&w4a, status) = status;
SCARG(&w4a, options) = options;
SCARG(&w4a, rusage) = SCARG(uap, rusage);
if ((error = sys_wait4(p, &w4a, retval)))
return error;
atomic_clearbits_int(&p->p_siglist, sigmask(SIGCHLD));
if (status != NULL) {
if ((error = copyin(status, &tstat, sizeof tstat)))
return error;
bsd_to_linux_wstat(&tstat);
return copyout(&tstat, SCARG(uap, status), sizeof tstat);
}
return 0;
}
int
linux_sys_setresgid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresgid16_args /* {
syscallarg(u_int16_t) rgid;
syscallarg(u_int16_t) egid;
syscallarg(u_int16_t) sgid;
} */ *uap = v;
struct sys_setresgid_args nuap;
u_int16_t rgid, egid, sgid;
rgid = SCARG(uap, rgid);
SCARG(&nuap, rgid) = (rgid == (u_int16_t)-1) ? (gid_t)-1 : rgid;
egid = SCARG(uap, egid);
SCARG(&nuap, egid) = (egid == (u_int16_t)-1) ? (gid_t)-1 : egid;
sgid = SCARG(uap, sgid);
SCARG(&nuap, sgid) = (sgid == (u_int16_t)-1) ? (gid_t)-1 : sgid;
return sys_setresgid(p, &nuap, retval);
}
int
linux_sys_getresgid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getresgid16_args /* {
syscallarg(u_int16_t *) rgid;
syscallarg(u_int16_t *) egid;
syscallarg(u_int16_t *) sgid;
} */ *uap = v;
struct sys_getresgid_args nuap;
SCARG(&nuap, rgid) = (gid_t *)SCARG(uap, rgid);
SCARG(&nuap, egid) = (gid_t *)SCARG(uap, egid);
SCARG(&nuap, sgid) = (gid_t *)SCARG(uap, sgid);
return sys_getresgid(p, &nuap, retval);
}
int
linux_sys_setresuid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresuid16_args /* {
syscallarg(u_int16_t) ruid;
syscallarg(u_int16_t) euid;
syscallarg(u_int16_t) suid;
} */ *uap = v;
struct sys_setresuid_args nuap;
u_int16_t ruid, euid, suid;
ruid = SCARG(uap, ruid);
SCARG(&nuap, ruid) = (ruid == (u_int16_t)-1) ? (uid_t)-1 : ruid;
euid = SCARG(uap, euid);
SCARG(&nuap, euid) = (euid == (u_int16_t)-1) ? (uid_t)-1 : euid;
suid = SCARG(uap, suid);
SCARG(&nuap, suid) = (suid == (u_int16_t)-1) ? (uid_t)-1 : suid;
return sys_setresuid(p, &nuap, retval);
}
int
linux_sys_getresuid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getresuid16_args /* {
syscallarg(u_int16_t *) ruid;
syscallarg(u_int16_t *) euid;
syscallarg(u_int16_t *) suid;
} */ *uap = v;
struct sys_getresuid_args nuap;
SCARG(&nuap, ruid) = (uid_t *)SCARG(uap, ruid);
SCARG(&nuap, euid) = (uid_t *)SCARG(uap, euid);
SCARG(&nuap, suid) = (uid_t *)SCARG(uap, suid);
return sys_getresuid(p, &nuap, retval);
}
/*
* This is the old brk(2) call. I don't think anything in the Linux
* world uses this anymore
*/
int
linux_sys_break(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
#if 0
struct linux_sys_brk_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
#endif
return ENOSYS;
}
/*
* Linux brk(2). The check if the new address is >= the old one is
* done in the kernel in Linux. OpenBSD does it in the library.
*/
int
linux_sys_brk(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_brk_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
char *nbrk = SCARG(uap, nsize);
struct sys_obreak_args oba;
struct vmspace *vm = p->p_vmspace;
struct linux_emuldata *ed = (struct linux_emuldata*)p->p_emuldata;
SCARG(&oba, nsize) = nbrk;
if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0)
ed->p_break = (char*)nbrk;
else
nbrk = ed->p_break;
retval[0] = (register_t)nbrk;
return 0;
}
/*
* I wonder why Linux has gettimeofday() _and_ time().. Still, we
* need to deal with it.
*/
int
linux_sys_time(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_time_args /* {
linux_time_t *t;
} */ *uap = v;
struct timeval atv;
linux_time_t tt;
int error;
microtime(&atv);
tt = atv.tv_sec;
if (SCARG(uap, t) && (error = copyout(&tt, SCARG(uap, t), sizeof tt)))
return error;
retval[0] = tt;
return 0;
}
/*
* Convert BSD statfs structure to Linux statfs structure.
* The Linux structure has less fields, and it also wants
* the length of a name in a dir entry in a field, which
* we fake (probably the wrong way).
*/
static void
bsd_to_linux_statfs(bsp, lsp)
struct statfs *bsp;
struct linux_statfs *lsp;
{
/*
* Convert BSD filesystem names to Linux filesystem type numbers
* where possible. Linux statfs uses a value of -1 to indicate
* an unsupported field.
*/
if (!strcmp(bsp->f_fstypename, MOUNT_FFS) ||
!strcmp(bsp->f_fstypename, MOUNT_MFS))
lsp->l_ftype = 0x11954;
else if (!strcmp(bsp->f_fstypename, MOUNT_NFS))
lsp->l_ftype = 0x6969;
else if (!strcmp(bsp->f_fstypename, MOUNT_MSDOS))
lsp->l_ftype = 0x4d44;
else if (!strcmp(bsp->f_fstypename, MOUNT_PROCFS))
lsp->l_ftype = 0x9fa0;
else if (!strcmp(bsp->f_fstypename, MOUNT_EXT2FS))
lsp->l_ftype = 0xef53;
else if (!strcmp(bsp->f_fstypename, MOUNT_CD9660))
lsp->l_ftype = 0x9660;
else if (!strcmp(bsp->f_fstypename, MOUNT_NCPFS))
lsp->l_ftype = 0x6969;
else
lsp->l_ftype = -1;
lsp->l_fbsize = bsp->f_bsize;
lsp->l_fblocks = bsp->f_blocks;
lsp->l_fbfree = bsp->f_bfree;
lsp->l_fbavail = bsp->f_bavail;
lsp->l_ffiles = bsp->f_files;
lsp->l_fffree = bsp->f_ffree;
lsp->l_ffsid.val[0] = bsp->f_fsid.val[0];
lsp->l_ffsid.val[1] = bsp->f_fsid.val[1];
lsp->l_fnamelen = MAXNAMLEN; /* XXX */
}
/*
* Implement the fs stat functions. Straightforward.
*/
int
linux_sys_statfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_statfs_args /* {
syscallarg(char *) path;
syscallarg(struct linux_statfs *) sp;
} */ *uap = v;
struct statfs btmp, *bsp;
struct linux_statfs ltmp;
struct sys_statfs_args bsa;
caddr_t sg;
int error;
sg = stackgap_init(p->p_emul);
bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
SCARG(&bsa, path) = SCARG(uap, path);
SCARG(&bsa, buf) = bsp;
if ((error = sys_statfs(p, &bsa, retval)))
return error;
if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
return error;
bsd_to_linux_statfs(&btmp, <mp);
return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
}
int
linux_sys_fstatfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct linux_statfs *) sp;
} */ *uap = v;
struct statfs btmp, *bsp;
struct linux_statfs ltmp;
struct sys_fstatfs_args bsa;
caddr_t sg;
int error;
sg = stackgap_init(p->p_emul);
bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
SCARG(&bsa, fd) = SCARG(uap, fd);
SCARG(&bsa, buf) = bsp;
if ((error = sys_fstatfs(p, &bsa, retval)))
return error;
if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
return error;
bsd_to_linux_statfs(&btmp, <mp);
return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
}
/*
* uname(). Just copy the info from the various strings stored in the
* kernel, and put it in the Linux utsname structure. That structure
* is almost the same as the OpenBSD one, only it has fields 65 characters
* long, and an extra domainname field.
*/
int
linux_sys_uname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_utsname *) up;
} */ *uap = v;
extern char hostname[], machine[], domainname[];
struct linux_utsname luts;
int len;
char *cp;
strlcpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strlcpy(luts.l_release, osrelease, sizeof(luts.l_release));
strlcpy(luts.l_version, version, sizeof(luts.l_version));
strlcpy(luts.l_machine, machine, sizeof(luts.l_machine));
strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
/* This part taken from the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
*cp = (len > 1) ? ' ' : '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
int
linux_sys_olduname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_oldutsname *) up;
} */ *uap = v;
extern char hostname[], machine[];
struct linux_oldutsname luts;
int len;
char *cp;
strlcpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strlcpy(luts.l_release, osrelease, sizeof(luts.l_release));
strlcpy(luts.l_version, version, sizeof(luts.l_version));
strlcpy(luts.l_machine, machine, sizeof(luts.l_machine));
/* This part taken from the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
*cp = (len > 1) ? ' ' : '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
int
linux_sys_oldolduname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_oldoldutsname *) up;
} */ *uap = v;
extern char hostname[], machine[];
struct linux_oldoldutsname luts;
int len;
char *cp;
strlcpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strlcpy(luts.l_release, osrelease, sizeof(luts.l_release));
strlcpy(luts.l_version, version, sizeof(luts.l_version));
strlcpy(luts.l_machine, machine, sizeof(luts.l_machine));
/* This part taken from the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
*cp = (len > 1) ? ' ' : '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
/*
* Linux wants to pass everything to a syscall in registers. However,
* mmap() has 6 of them. Oops: out of register error. They just pass
* everything in a structure.
*/
int
linux_sys_mmap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mmap_args /* {
syscallarg(struct linux_mmap *) lmp;
} */ *uap = v;
struct linux_mmap lmap;
struct linux_sys_mmap2_args nlmap;
struct sys_mmap_args cma;
int error;
if ((error = copyin(SCARG(uap, lmp), &lmap, sizeof lmap)))
return error;
if (lmap.lm_pos & PAGE_MASK)
return EINVAL;
/* repackage into something sane */
SCARG(&nlmap,addr) = (unsigned long)lmap.lm_addr;
SCARG(&nlmap,len) = lmap.lm_len;
SCARG(&nlmap,prot) = lmap.lm_prot;
SCARG(&nlmap,flags) = lmap.lm_flags;
SCARG(&nlmap,fd) = lmap.lm_fd;
SCARG(&nlmap,offset) = (unsigned)lmap.lm_pos;
linux_to_bsd_mmap_args(&cma, &nlmap);
SCARG(&cma, pos) = (off_t)SCARG(&nlmap, offset);
return sys_mmap(p, &cma, retval);
}
/*
* Guts of most architectures' mmap64() implementations. This shares
* its list of arguments with linux_sys_mmap().
*
* The difference in linux_sys_mmap2() is that "offset" is actually
* (offset / pagesize), not an absolute byte count. This translation
* to pagesize offsets is done inside glibc between the mmap64() call
* point, and the actual syscall.
*/
int
linux_sys_mmap2(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mmap2_args /* {
syscallarg(unsigned long) addr;
syscallarg(size_t) len;
syscallarg(int) prot;
syscallarg(int) flags;
syscallarg(int) fd;
syscallarg(linux_off_t) offset;
} */ *uap = v;
struct sys_mmap_args cma;
linux_to_bsd_mmap_args(&cma, uap);
SCARG(&cma, pos) = ((off_t)SCARG(uap, offset)) << PAGE_SHIFT;
return sys_mmap(p, &cma, retval);
}
static void
linux_to_bsd_mmap_args(cma, uap)
struct sys_mmap_args *cma;
const struct linux_sys_mmap2_args *uap;
{
int flags = MAP_TRYFIXED, fl = SCARG(uap, flags);
flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED);
flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE);
flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED);
flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON);
/* XXX XAX ERH: Any other flags here? There are more defined... */
SCARG(cma, addr) = (void *)SCARG(uap, addr);
SCARG(cma, len) = SCARG(uap, len);
SCARG(cma, prot) = SCARG(uap, prot);
if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */
SCARG(cma, prot) |= VM_PROT_READ;
SCARG(cma, flags) = flags;
SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd);
SCARG(cma, pad) = 0;
}
int
linux_sys_mremap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mremap_args /* {
syscallarg(void *) old_address;
syscallarg(size_t) old_size;
syscallarg(size_t) new_size;
syscallarg(u_long) flags;
} */ *uap = v;
struct sys_munmap_args mua;
size_t old_size, new_size;
int error;
old_size = round_page(SCARG(uap, old_size));
new_size = round_page(SCARG(uap, new_size));
/*
* Growing mapped region.
*/
if (new_size > old_size) {
/*
* XXX Implement me. What we probably want to do is
* XXX dig out the guts of the old mapping, mmap that
* XXX object again with the new size, then munmap
* XXX the old mapping.
*/
*retval = 0;
return (ENOMEM);
}
/*
* Shrinking mapped region.
*/
if (new_size < old_size) {
SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) + new_size;
SCARG(&mua, len) = old_size - new_size;
error = sys_munmap(p, &mua, retval);
*retval = error ? 0 : (register_t)SCARG(uap, old_address);
return (error);
}
/*
* No change.
*/
*retval = (register_t)SCARG(uap, old_address);
return (0);
}
/*
* This code is partly stolen from src/lib/libc/gen/times.c
* XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here
*/
#define CLK_TCK 100
#define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
int
linux_sys_times(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_times_args /* {
syscallarg(struct times *) tms;
} */ *uap = v;
struct timeval t;
struct linux_tms ltms;
struct rusage ru;
int error;
calcru(p, &ru.ru_utime, &ru.ru_stime, NULL);
ltms.ltms_utime = CONVTCK(ru.ru_utime);
ltms.ltms_stime = CONVTCK(ru.ru_stime);
ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);
if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms)))
return error;
microuptime(&t);
retval[0] = ((linux_clock_t)(CONVTCK(t)));
return 0;
}
/*
* OpenBSD passes fd[0] in retval[0], and fd[1] in retval[1].
* Linux directly passes the pointer.
*/
int
linux_sys_pipe(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_pipe_args /* {
syscallarg(int *) pfds;
} */ *uap = v;
int error;
int pfds[2];
#ifdef __i386__
int reg_edx = retval[1];
#endif /* __i386__ */
if ((error = sys_opipe(p, 0, retval))) {
#ifdef __i386__
retval[1] = reg_edx;
#endif /* __i386__ */
return error;
}
/* Assumes register_t is an int */
pfds[0] = retval[0];
pfds[1] = retval[1];
if ((error = copyout(pfds, SCARG(uap, pfds), 2 * sizeof (int)))) {
#ifdef __i386__
retval[1] = reg_edx;
#endif /* __i386__ */
fdrelease(p, retval[0]);
fdrelease(p, retval[1]);
return error;
}
retval[0] = 0;
#ifdef __i386__
retval[1] = reg_edx;
#endif /* __i386__ */
return 0;
}
/*
* Alarm. This is a libc call which uses setitimer(2) in OpenBSD.
* Fiddle with the timers to make it work.
*/
int
linux_sys_alarm(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_alarm_args /* {
syscallarg(unsigned int) secs;
} */ *uap = v;
int s;
struct itimerval *itp, it;
struct timeval tv;
int timo;
itp = &p->p_realtimer;
s = splclock();
/*
* Clear any pending timer alarms.
*/
getmicrouptime(&tv);
timeout_del(&p->p_realit_to);
timerclear(&itp->it_interval);
if (timerisset(&itp->it_value) &&
timercmp(&itp->it_value, &tv, >))
timersub(&itp->it_value, &tv, &itp->it_value);
/*
* Return how many seconds were left (rounded up)
*/
retval[0] = itp->it_value.tv_sec;
if (itp->it_value.tv_usec)
retval[0]++;
/*
* alarm(0) just resets the timer.
*/
if (SCARG(uap, secs) == 0) {
timerclear(&itp->it_value);
splx(s);
return 0;
}
/*
* Check the new alarm time for sanity, and set it.
*/
timerclear(&it.it_interval);
it.it_value.tv_sec = SCARG(uap, secs);
it.it_value.tv_usec = 0;
if (itimerfix(&it.it_value) || itimerfix(&it.it_interval)) {
splx(s);
return (EINVAL);
}
if (timerisset(&it.it_value)) {
timo = tvtohz(&it.it_value);
timeradd(&it.it_value, &tv, &it.it_value);
timeout_add(&p->p_realit_to, timo);
}
p->p_realtimer = it;
splx(s);
return 0;
}
/*
* utime(). Do conversion to things that utimes() understands,
* and pass it on.
*/
int
linux_sys_utime(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_utime_args /* {
syscallarg(char *) path;
syscallarg(struct linux_utimbuf *)times;
} */ *uap = v;
caddr_t sg;
int error;
struct sys_utimes_args ua;
struct timeval tv[2], *tvp;
struct linux_utimbuf lut;
sg = stackgap_init(p->p_emul);
tvp = (struct timeval *) stackgap_alloc(&sg, sizeof(tv));
LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
SCARG(&ua, path) = SCARG(uap, path);
if (SCARG(uap, times) != NULL) {
if ((error = copyin(SCARG(uap, times), &lut, sizeof lut)))
return error;
tv[0].tv_usec = tv[1].tv_usec = 0;
tv[0].tv_sec = lut.l_actime;
tv[1].tv_sec = lut.l_modtime;
if ((error = copyout(tv, tvp, sizeof tv)))
return error;
SCARG(&ua, tptr) = tvp;
}
else
SCARG(&ua, tptr) = NULL;
return sys_utimes(p, &ua, retval);
}
/*
* The old Linux readdir was only able to read one entry at a time,
* even though it had a 'count' argument. In fact, the emulation
* of the old call was better than the original, because it did handle
* the count arg properly. Don't bother with it anymore now, and use
* it to distinguish between old and new. The difference is that the
* newer one actually does multiple entries, and the reclen field
* really is the reclen, not the namelength.
*/
int
linux_sys_readdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_readdir_args /* {
syscallarg(int) fd;
syscallarg(struct linux_dirent *) dent;
syscallarg(unsigned int) count;
} */ *uap = v;
SCARG(uap, count) = 1;
return linux_sys_getdents(p, uap, retval);
}
/*
* Linux 'readdir' call. This code is mostly taken from the
* SunOS getdents call (see compat/sunos/sunos_misc.c), though
* an attempt has been made to keep it a little cleaner (failing
* miserably, because of the cruft needed if count 1 is passed).
*
* The d_off field should contain the offset of the next valid entry,
* but in Linux it has the offset of the entry itself. We emulate
* that bug here.
*
* Read in BSD-style entries, convert them, and copy them out.
*
* Note that this doesn't handle union-mounted filesystems.
*/
int linux_readdir_callback(void *, struct dirent *, off_t);
struct linux_readdir_callback_args {
caddr_t outp;
int resid;
int oldcall;
int is64bit;
};
int
linux_readdir_callback(arg, bdp, cookie)
void *arg;
struct dirent *bdp;
off_t cookie;
{
struct linux_dirent64 idb64;
struct linux_dirent idb;
struct linux_readdir_callback_args *cb = arg;
int linux_reclen;
int error;
if (cb->oldcall == 2)
return (ENOMEM);
linux_reclen = (cb->is64bit) ?
LINUX_RECLEN(&idb64, bdp->d_namlen) :
LINUX_RECLEN(&idb, bdp->d_namlen);
if (cb->resid < linux_reclen)
return (ENOMEM);
if (cb->is64bit) {
idb64.d_ino = (linux_ino64_t)bdp->d_fileno;
idb64.d_off = (linux_off64_t)cookie;
idb64.d_reclen = (u_short)linux_reclen;
idb64.d_type = bdp->d_type;
strlcpy(idb64.d_name, bdp->d_name, sizeof(idb64.d_name));
error = copyout((caddr_t)&idb64, cb->outp, linux_reclen);
} else {
idb.d_ino = (linux_ino_t)bdp->d_fileno;
if (cb->oldcall) {
/*
* The old readdir() call misuses the offset
* and reclen fields.
*/
idb.d_off = (linux_off_t)linux_reclen;
idb.d_reclen = (u_short)bdp->d_namlen;
} else {
idb.d_off = (linux_off_t)cookie;
idb.d_reclen = (u_short)linux_reclen;
}
strlcpy(idb.d_name, bdp->d_name, sizeof(idb.d_name));
error = copyout((caddr_t)&idb, cb->outp, linux_reclen);
}
if (error)
return (error);
/* advance output past Linux-shaped entry */
cb->outp += linux_reclen;
cb->resid -= linux_reclen;
if (cb->oldcall == 1)
++cb->oldcall;
return (0);
}
int
linux_sys_getdents64(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return getdents_common(p, v, retval, 1);
}
int
linux_sys_getdents(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return getdents_common(p, v, retval, 0);
}
static int
getdents_common(p, v, retval, is64bit)
struct proc *p;
void *v;
register_t *retval;
int is64bit;
{
struct linux_sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(void *) dirent;
syscallarg(unsigned) count;
} */ *uap = v;
struct linux_readdir_callback_args args;
struct file *fp;
int error;
int nbytes = SCARG(uap, count);
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if (nbytes == 1) { /* emulating old, broken behaviour */
/* readdir(2) case. Always struct dirent. */
if (is64bit) {
FRELE(fp);
return (EINVAL);
}
nbytes = sizeof(struct linux_dirent);
args.oldcall = 1;
} else {
args.oldcall = 0;
}
args.resid = nbytes;
args.outp = (caddr_t)SCARG(uap, dirent);
args.is64bit = is64bit;
if ((error = readdir_with_callback(fp, &fp->f_offset, nbytes,
linux_readdir_callback, &args)) != 0)
goto exit;
*retval = nbytes - args.resid;
exit:
FRELE(fp);
return (error);
}
/*
* Not sure why the arguments to this older version of select() were put
* into a structure, because there are 5, and that can all be handled
* in registers on the i386 like Linux wants to.
*/
int
linux_sys_oldselect(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_oldselect_args /* {
syscallarg(struct linux_select *) lsp;
} */ *uap = v;
struct linux_select ls;
int error;
if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls))))
return error;
return linux_select1(p, retval, ls.nfds, ls.readfds, ls.writefds,
ls.exceptfds, ls.timeout);
}
/*
* Even when just using registers to pass arguments to syscalls you can
* have 5 of them on the i386. So this newer version of select() does
* this.
*/
int
linux_sys_select(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_select_args /* {
syscallarg(int) nfds;
syscallarg(fd_set *) readfds;
syscallarg(fd_set *) writefds;
syscallarg(fd_set *) exceptfds;
syscallarg(struct timeval *) timeout;
} */ *uap = v;
return linux_select1(p, retval, SCARG(uap, nfds), SCARG(uap, readfds),
SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout));
}
/*
* Common code for the old and new versions of select(). A couple of
* things are important:
* 1) return the amount of time left in the 'timeout' parameter
* 2) select never returns ERESTART on Linux, always return EINTR
*/
int
linux_select1(p, retval, nfds, readfds, writefds, exceptfds, timeout)
struct proc *p;
register_t *retval;
int nfds;
fd_set *readfds, *writefds, *exceptfds;
struct timeval *timeout;
{
struct sys_select_args bsa;
struct timeval tv0, tv1, utv, *tvp;
caddr_t sg;
int error;
SCARG(&bsa, nd) = nfds;
SCARG(&bsa, in) = readfds;
SCARG(&bsa, ou) = writefds;
SCARG(&bsa, ex) = exceptfds;
SCARG(&bsa, tv) = timeout;
/*
* Store current time for computation of the amount of
* time left.
*/
if (timeout) {
if ((error = copyin(timeout, &utv, sizeof(utv))))
return error;
if (itimerfix(&utv)) {
/*
* The timeval was invalid. Convert it to something
* valid that will act as it does under Linux.
*/
sg = stackgap_init(p->p_emul);
tvp = stackgap_alloc(&sg, sizeof(utv));
utv.tv_sec += utv.tv_usec / 1000000;
utv.tv_usec %= 1000000;
if (utv.tv_usec < 0) {
utv.tv_sec -= 1;
utv.tv_usec += 1000000;
}
if (utv.tv_sec < 0)
timerclear(&utv);
if ((error = copyout(&utv, tvp, sizeof(utv))))
return error;
SCARG(&bsa, tv) = tvp;
}
microtime(&tv0);
}
error = sys_select(p, &bsa, retval);
if (error) {
/*
* See fs/select.c in the Linux kernel. Without this,
* Maelstrom doesn't work.
*/
if (error == ERESTART)
error = EINTR;
return error;
}
if (timeout) {
if (*retval) {
/*
* Compute how much time was left of the timeout,
* by subtracting the current time and the time
* before we started the call, and subtracting
* that result from the user-supplied value.
*/
microtime(&tv1);
timersub(&tv1, &tv0, &tv1);
timersub(&utv, &tv1, &utv);
if (utv.tv_sec < 0)
timerclear(&utv);
} else
timerclear(&utv);
if ((error = copyout(&utv, timeout, sizeof(utv))))
return error;
}
return 0;
}
/*
* Get the process group of a certain process. Look it up
* and return the value.
*/
int
linux_sys_getpgid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getpgid_args /* {
syscallarg(int) pid;
} */ *uap = v;
struct proc *targp;
if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) {
if ((targp = pfind(SCARG(uap, pid))) == 0)
return ESRCH;
}
else
targp = p;
retval[0] = targp->p_pgid;
return 0;
}
/*
* Set the 'personality' (emulation mode) for the current process. Only
* accept the Linux personality here (0). This call is needed because
* the Linux ELF crt0 issues it in an ugly kludge to make sure that
* ELF binaries run in Linux mode, not SVR4 mode.
*/
int
linux_sys_personality(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_personality_args /* {
syscallarg(int) per;
} */ *uap = v;
if (SCARG(uap, per) != 0)
return EINVAL;
retval[0] = 0;
return 0;
}
/*
* The calls are here because of type conversions.
*/
int
linux_sys_setreuid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setreuid16_args /* {
syscallarg(int) ruid;
syscallarg(int) euid;
} */ *uap = v;
struct sys_setreuid_args bsa;
SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, ruid);
SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, euid);
return sys_setreuid(p, &bsa, retval);
}
int
linux_sys_setregid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setregid16_args /* {
syscallarg(int) rgid;
syscallarg(int) egid;
} */ *uap = v;
struct sys_setregid_args bsa;
SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ?
(uid_t)-1 : SCARG(uap, rgid);
SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ?
(uid_t)-1 : SCARG(uap, egid);
return sys_setregid(p, &bsa, retval);
}
int
linux_sys_getsid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getsid_args /* {
syscallarg(int) pid;
} */ *uap = v;
struct proc *p1;
pid_t pid;
pid = (pid_t)SCARG(uap, pid);
if (pid == 0) {
retval[0] = (int)p->p_session; /* XXX Oh well */
return 0;
}
p1 = pfind((int)pid);
if (p1 == NULL)
return ESRCH;
retval[0] = (int)p1->p_session;
return 0;
}
int
linux_sys___sysctl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys___sysctl_args /* {
syscallarg(struct linux___sysctl *) lsp;
} */ *uap = v;
struct linux___sysctl ls;
struct sys___sysctl_args bsa;
int error;
if ((error = copyin(SCARG(uap, lsp), &ls, sizeof ls)))
return error;
SCARG(&bsa, name) = ls.name;
SCARG(&bsa, namelen) = ls.namelen;
SCARG(&bsa, old) = ls.old;
SCARG(&bsa, oldlenp) = ls.oldlenp;
SCARG(&bsa, new) = ls.new;
SCARG(&bsa, newlen) = ls.newlen;
return sys___sysctl(p, &bsa, retval);
}
/*
* We have nonexistent fsuid equal to uid.
* If modification is requested, refuse.
*/
int
linux_sys_setfsuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setfsuid_args /* {
syscallarg(uid_t) uid;
} */ *uap = v;
uid_t uid;
uid = SCARG(uap, uid);
if (p->p_cred->p_ruid != uid)
return sys_nosys(p, v, retval);
else
return (0);
}
int
linux_sys_getfsuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return sys_getuid(p, v, retval);
}
int
linux_sys_nice(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_nice_args /* {
syscallarg(int) incr;
} */ *uap = v;
struct sys_setpriority_args bsa;
SCARG(&bsa, which) = PRIO_PROCESS;
SCARG(&bsa, who) = 0;
SCARG(&bsa, prio) = SCARG(uap, incr);
return sys_setpriority(p, &bsa, retval);
}
int
linux_sys_stime(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_time_args /* {
linux_time_t *t;
} */ *uap = v;
struct timespec ats;
linux_time_t tt;
int error;
if ((error = suser(p, 0)) != 0)
return (error);
if ((error = copyin(SCARG(uap, t), &tt, sizeof(tt))) != 0)
return (error);
ats.tv_sec = tt;
ats.tv_nsec = 0;
error = settime(&ats);
return (error);
}
int
linux_sys_getpid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
*retval = p->p_pid;
return (0);
}
int
linux_sys_getuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
*retval = p->p_cred->p_ruid;
return (0);
}
int
linux_sys_getgid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
*retval = p->p_cred->p_rgid;
return (0);
}
/*
* sysinfo()
*/
/* ARGSUSED */
int
linux_sys_sysinfo(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_sysinfo_args /* {
syscallarg(struct linux_sysinfo *) sysinfo;
} */ *uap = v;
struct linux_sysinfo si;
struct loadavg *la;
extern int bufpages;
struct timeval tv;
getmicrouptime(&tv);
si.uptime = tv.tv_sec;
la = &averunnable;
si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.totalram = ctob(physmem);
si.freeram = uvmexp.free * uvmexp.pagesize;
si.sharedram = 0;/* XXX */
si.bufferram = bufpages * PAGE_SIZE;
si.totalswap = uvmexp.swpages * PAGE_SIZE;
si.freeswap = (uvmexp.swpages - uvmexp.swpginuse) * PAGE_SIZE;
si.procs = nprocs;
/* The following are only present in newer Linux kernels. */
si.totalbig = 0;
si.freebig = 0;
si.mem_unit = 1;
return (copyout(&si, SCARG(uap, sysinfo), sizeof(si)));
}
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