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Diffstat (limited to 'sys/compat/linux/linux_misc.c')
| -rw-r--r-- | sys/compat/linux/linux_misc.c | 1105 |
1 files changed, 1105 insertions, 0 deletions
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c new file mode 100644 index 00000000000..a244225896a --- /dev/null +++ b/sys/compat/linux/linux_misc.c @@ -0,0 +1,1105 @@ +/* $NetBSD: linux_misc.c,v 1.22 1995/10/09 11:24:05 mycroft Exp $ */ + +/* + * Copyright (c) 1995 Frank van der Linden + * All rights reserved. + * + * 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 for the NetBSD Project + * by Frank van der Linden + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/dir.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 <vm/vm.h> +#include <vm/vm_param.h> + +#include <compat/linux/linux_types.h> +#include <compat/linux/linux_fcntl.h> +#include <compat/linux/linux_mmap.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> + +/* + * 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. + */ +static int +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). Passed on to the NetBSD call, surrounded by code to + * reserve some space for a NetBSD-style wait status, and converting + * it to what Linux wants. + */ +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 w4a; + int error, *status, tstat; + caddr_t sg; + + if (SCARG(uap, status) != NULL) { + sg = stackgap_init(p->p_emul); + status = (int *) stackgap_alloc(&sg, sizeof status); + } else + status = NULL; + + SCARG(&w4a, pid) = SCARG(uap, pid); + SCARG(&w4a, status) = status; + SCARG(&w4a, options) = SCARG(uap, options); + SCARG(&w4a, rusage) = NULL; + + if ((error = sys_wait4(p, &w4a, retval))) + return error; + + 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; +} + +/* + * This is very much the same as waitpid() + */ +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; + caddr_t sg; + + if (SCARG(uap, status) != NULL) { + sg = stackgap_init(p->p_emul); + status = (int *) stackgap_alloc(&sg, sizeof status); + } else + status = NULL; + + SCARG(&w4a, pid) = SCARG(uap, pid); + SCARG(&w4a, status) = status; + SCARG(&w4a, options) = SCARG(uap, options); + SCARG(&w4a, rusage) = SCARG(uap, rusage); + + if ((error = sys_wait4(p, &w4a, retval))) + return error; + + 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; +} + +/* + * 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; +{ + struct linux_sys_brk_args /* { + syscallarg(char *) nsize; + } */ *uap = v; + + return ENOSYS; +} + +/* + * Linux brk(2). The check if the new address is >= the old one is + * done in the kernel in Linux. NetBSD 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; + int error = 0; + caddr_t oldbrk, newbrk; + + oldbrk = vm->vm_daddr + ctob(vm->vm_dsize); + /* + * XXX inconsistent.. Linux always returns at least the old + * brk value, but it will be page-aligned if this fails, + * and possibly not page aligned if it succeeds (the user + * supplied pointer is returned). + */ + SCARG(&oba, nsize) = nbrk; + + if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0) + retval[0] = (register_t)nbrk; + else + retval[0] = (register_t)oldbrk; + + 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; +{ + + lsp->l_ftype = bsp->f_type; + 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 NetBSD 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 ostype[], hostname[], osrelease[], version[], machine[], + domainname[]; + struct linux_utsname luts; + int len; + char *cp; + + strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname)); + strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); + strncpy(luts.l_release, osrelease, sizeof(luts.l_release)); + strncpy(luts.l_version, version, sizeof(luts.l_version)); + strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); + strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); + + /* This part taken from the the uname() in libc */ + len = sizeof(luts.l_version); + for (cp = luts.l_version; len--; ++cp) + if (*cp == '\n' || *cp == '\t') + if (len > 1) + *cp = ' '; + else + *cp = '\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 ostype[], hostname[], osrelease[], version[], machine[]; + struct linux_oldutsname luts; + int len; + char *cp; + + strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname)); + strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); + strncpy(luts.l_release, osrelease, sizeof(luts.l_release)); + strncpy(luts.l_version, version, sizeof(luts.l_version)); + strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); + + /* This part taken from the the uname() in libc */ + len = sizeof(luts.l_version); + for (cp = luts.l_version; len--; ++cp) + if (*cp == '\n' || *cp == '\t') + if (len > 1) + *cp = ' '; + else + *cp = '\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 ostype[], hostname[], osrelease[], version[], machine[]; + struct linux_oldoldutsname luts; + int len; + char *cp; + + strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname)); + strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); + strncpy(luts.l_release, osrelease, sizeof(luts.l_release)); + strncpy(luts.l_version, version, sizeof(luts.l_version)); + strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); + + /* This part taken from the the uname() in libc */ + len = sizeof(luts.l_version); + for (cp = luts.l_version; len--; ++cp) + if (*cp == '\n' || *cp == '\t') + if (len > 1) + *cp = ' '; + else + *cp = '\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 sys_mmap_args cma; + int error, flags; + + if ((error = copyin(SCARG(uap, lmp), &lmap, sizeof lmap))) + return error; + + flags = 0; + flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_SHARED, MAP_SHARED); + flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_PRIVATE, MAP_PRIVATE); + flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_FIXED, MAP_FIXED); + flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_ANON, MAP_ANON); + + SCARG(&cma,addr) = lmap.lm_addr; + SCARG(&cma,len) = lmap.lm_len; + SCARG(&cma,prot) = lmap.lm_prot; + SCARG(&cma,flags) = flags; + SCARG(&cma,fd) = lmap.lm_fd; + SCARG(&cma,pad) = 0; + SCARG(&cma,pos) = lmap.lm_pos; + + return sys_mmap(p, &cma, retval); +} + +/* + * Linux doesn't use the retval[1] value to determine whether + * we are the child or parent. + */ +int +linux_sys_fork(p, v, retval) + struct proc *p; + void *v; + register_t *retval; +{ + int error; + + if ((error = sys_fork(p, v, retval))) + return error; + + if (retval[1] == 1) + retval[0] = 0; + + return 0; +} + +/* + * This code is partly stolen from src/lib/libc/compat-43/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, s; + + 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; + + s = splclock(); + timersub(&time, &boottime, &t); + splx(s); + + retval[0] = ((linux_clock_t)(CONVTCK(t))); + return 0; +} + +/* + * NetBSD 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; + + if ((error = sys_pipe(p, 0, retval))) + return error; + + /* Assumes register_t is an int */ + + if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int)))) + return error; + + retval[0] = 0; + return 0; +} + +/* + * Alarm. This is a libc call which uses setitimer(2) in NetBSD. + * 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 error, s; + struct itimerval *itp, it; + + itp = &p->p_realtimer; + s = splclock(); + /* + * Clear any pending timer alarms. + */ + untimeout(realitexpire, p); + timerclear(&itp->it_interval); + if (timerisset(&itp->it_value) && + timercmp(&itp->it_value, &time, >)) + timersub(&itp->it_value, &time, &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)) { + timeradd(&it.it_value, &time, &it.it_value); + timeout(realitexpire, p, hzto(&it.it_value)); + } + 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); + 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; + tvp = (struct timeval *) stackgap_alloc(&sg, sizeof(tv)); + if ((error = copyout(tv, tvp, sizeof tv))) + return error; + SCARG(&ua, tptr) = tvp; + } + else + SCARG(&ua, tptr) = NULL; + + return sys_utimes(p, uap, 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_sys_getdents(p, v, retval) + struct proc *p; + void *v; + register_t *retval; +{ + struct linux_sys_readdir_args /* { + syscallarg(int) fd; + syscallarg(caddr_t) dent; + syscallarg(unsigned int) count; + } */ *uap = v; + register struct dirent *bdp; + struct vnode *vp; + caddr_t inp, buf; /* BSD-format */ + int len, reclen; /* BSD-format */ + caddr_t outp; /* Linux-format */ + int resid, linux_reclen;/* Linux-format */ + struct file *fp; + struct uio auio; + struct iovec aiov; + struct linux_dirent idb; + off_t off; /* true file offset */ + int buflen, error, eofflag, nbytes, oldcall; + struct vattr va; + u_long *cookiebuf, *cookie; + int ncookies; + + if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) + return (error); + + if ((fp->f_flag & FREAD) == 0) + return (EBADF); + + vp = (struct vnode *)fp->f_data; + + if (vp->v_type != VDIR) /* XXX vnode readdir op should do this */ + return (EINVAL); + + if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) + return error; + + nbytes = SCARG(uap, count); + if (nbytes == 1) { /* emulating old, broken behaviour */ + nbytes = sizeof (struct linux_dirent); + buflen = max(va.va_blocksize, nbytes); + oldcall = 1; + } else { + buflen = min(MAXBSIZE, nbytes); + oldcall = 0; + } + buf = malloc(buflen, M_TEMP, M_WAITOK); + ncookies = buflen / 16; + cookiebuf = malloc(ncookies * sizeof(*cookiebuf), M_TEMP, M_WAITOK); + VOP_LOCK(vp); + off = fp->f_offset; +again: + aiov.iov_base = buf; + aiov.iov_len = buflen; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_rw = UIO_READ; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_procp = p; + auio.uio_resid = buflen; + auio.uio_offset = off; + /* + * First we read into the malloc'ed buffer, then + * we massage it into user space, one record at a time. + */ + error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookiebuf, + ncookies); + if (error) + goto out; + + inp = buf; + outp = SCARG(uap, dent); + resid = nbytes; + if ((len = buflen - auio.uio_resid) == 0) + goto eof; + + for (cookie = cookiebuf; len > 0; len -= reclen) { + bdp = (struct dirent *)inp; + reclen = bdp->d_reclen; + if (reclen & 3) + panic("linux_readdir"); + if (bdp->d_fileno == 0) { + inp += reclen; /* it is a hole; squish it out */ + off = *cookie++; + continue; + } + linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); + if (reclen > len || resid < linux_reclen) { + /* entry too big for buffer, so just stop */ + outp++; + off = *cookie++; + break; + } + /* + * Massage in place to make a Linux-shaped dirent (otherwise + * we have to worry about touching user memory outside of + * the copyout() call). + */ + idb.d_ino = (linux_ino_t)bdp->d_fileno; + /* + * The old readdir() call misuses the offset and reclen fields. + */ + if (oldcall) { + idb.d_off = (linux_off_t)linux_reclen; + idb.d_reclen = (u_short)bdp->d_namlen; + } else { + idb.d_off = (linux_off_t)off; + idb.d_reclen = (u_short)linux_reclen; + } + strcpy(idb.d_name, bdp->d_name); + if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) + goto out; + /* advance past this real entry */ + inp += reclen; + off = *cookie++; /* each entry points to itself */ + /* advance output past Linux-shaped entry */ + outp += linux_reclen; + resid -= linux_reclen; + if (oldcall) + break; + } + + /* if we squished out the whole block, try again */ + if (outp == SCARG(uap, dent)) + goto again; + fp->f_offset = off; /* update the vnode offset */ + + if (oldcall) + nbytes = resid + linux_reclen; + +eof: + *retval = nbytes - resid; +out: + VOP_UNLOCK(vp); + free(cookiebuf, M_TEMP); + free(buf, M_TEMP); + 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_setreuid(p, v, retval) + struct proc *p; + void *v; + register_t *retval; +{ + struct linux_sys_setreuid_args /* { + syscallarg(int) ruid; + syscallarg(int) euid; + } */ *uap = v; + struct compat_43_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 compat_43_sys_setreuid(p, &bsa, retval); +} + +int +linux_sys_setregid(p, v, retval) + struct proc *p; + void *v; + register_t *retval; +{ + struct linux_sys_setregid_args /* { + syscallarg(int) rgid; + syscallarg(int) egid; + } */ *uap = v; + struct compat_43_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 compat_43_sys_setregid(p, &bsa, retval); +} |