de5a9a3e8b
Some code relies on having the file descriptor in m_in.fd. Consequently,
m_in is not only used to provide syscall parameters from user space to
VFS, but also as a global variable to store temporary data within VFS.
This has the ugly side effect that m_in gets overwritten during core
dumping.*
To work around this problem VFS now uses a so called "scratchpad" to
store temporary data that has to be globally accessible. This is a simple
table indexed by process number, just like fproc. The scratchpad allows
us to store the buffer pointer and buffer size for suspended system calls
(i.e., read, write, open, lock) instead of using fproc. This makes fproc
a bit smaller and fproc iterators a bit faster. Moreover, suspension of
processes becomes simpler altogether and suspended operations on pipes
are now less of a special case.
* This patch fixes a bug where due to unexpected m_in overwriting a
coredump would fail, and consequently resources are leaked. The coredump
was triggered with:
$ a() { a; }
$ a
145 lines
4 KiB
C
145 lines
4 KiB
C
/* This file contains the table used to map system call numbers onto the
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* routines that perform them.
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*/
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#define _TABLE
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#include "fs.h"
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include "file.h"
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#include "fproc.h"
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#include "lock.h"
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#include "scratchpad.h"
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#include "vnode.h"
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#include "vmnt.h"
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PUBLIC _PROTOTYPE (int (*call_vec[]), (void) ) = {
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no_sys, /* 0 = unused */
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no_sys, /* 1 = (exit) */
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no_sys, /* 2 = (fork) */
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do_read, /* 3 = read */
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do_write, /* 4 = write */
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do_open, /* 5 = open */
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do_close, /* 6 = close */
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no_sys, /* 7 = wait */
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do_creat, /* 8 = creat */
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do_link, /* 9 = link */
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do_unlink, /* 10 = unlink */
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no_sys, /* 11 = waitpid */
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do_chdir, /* 12 = chdir */
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no_sys, /* 13 = time */
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do_mknod, /* 14 = mknod */
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do_chmod, /* 15 = chmod */
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do_chown, /* 16 = chown */
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no_sys, /* 17 = break */
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do_stat, /* 18 = stat (prev)*/
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do_lseek, /* 19 = lseek */
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no_sys, /* 20 = getpid */
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do_mount, /* 21 = mount */
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do_umount, /* 22 = umount */
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no_sys, /* 23 = (setuid) */
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no_sys, /* 24 = getuid */
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no_sys, /* 25 = (stime) */
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no_sys, /* 26 = ptrace */
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no_sys, /* 27 = alarm */
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do_fstat, /* 28 = fstat (prev)*/
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no_sys, /* 29 = pause */
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do_utime, /* 30 = utime */
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no_sys, /* 31 = (stty) */
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no_sys, /* 32 = (gtty) */
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do_access, /* 33 = access */
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no_sys, /* 34 = (nice) */
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no_sys, /* 35 = (ftime) */
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do_sync, /* 36 = sync */
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no_sys, /* 37 = kill */
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do_rename, /* 38 = rename */
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do_mkdir, /* 39 = mkdir */
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do_unlink, /* 40 = rmdir */
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do_dup, /* 41 = dup */
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do_pipe, /* 42 = pipe */
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no_sys, /* 43 = times */
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no_sys, /* 44 = (prof) */
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do_slink, /* 45 = symlink */
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no_sys, /* 46 = (setgid)*/
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no_sys, /* 47 = getgid */
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no_sys, /* 48 = (signal)*/
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do_rdlink, /* 49 = readlink*/
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do_lstat, /* 50 = lstat (prev)*/
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no_sys, /* 51 = (acct) */
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no_sys, /* 52 = (phys) */
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no_sys, /* 53 = (lock) */
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do_ioctl, /* 54 = ioctl */
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do_fcntl, /* 55 = fcntl */
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no_sys, /* 56 = (mpx) */
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do_fsready, /* 57 = FS proc ready */
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no_sys, /* 58 = unused */
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no_sys, /* 59 = (execve)*/
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do_umask, /* 60 = umask */
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do_chroot, /* 61 = chroot */
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no_sys, /* 62 = (setsid)*/
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no_sys, /* 63 = (getpgrp)*/
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no_sys, /* 64 = (itimer)*/
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do_stat, /* 65 = stat */
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do_fstat, /* 66 = fstat */
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do_lstat, /* 67 = lstat */
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no_sys, /* 68 = unused */
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no_sys, /* 69 = unused */
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no_sys, /* 70 = unused */
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no_sys, /* 71 = (sigaction) */
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no_sys, /* 72 = (sigsuspend) */
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no_sys, /* 73 = (sigpending) */
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no_sys, /* 74 = (sigprocmask) */
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no_sys, /* 75 = (sigreturn) */
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no_sys, /* 76 = (reboot) */
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do_svrctl, /* 77 = svrctl */
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no_sys, /* 78 = (sysuname) */
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no_sys, /* 79 = unused */
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do_getdents, /* 80 = getdents */
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do_llseek, /* 81 = llseek */
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do_fstatfs, /* 82 = fstatfs */
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do_statvfs, /* 83 = fstatvfs */
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do_fstatvfs, /* 84 = statvfs */
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do_select, /* 85 = select */
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do_fchdir, /* 86 = fchdir */
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do_fsync, /* 87 = fsync */
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no_sys, /* 88 = (getpriority) */
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no_sys, /* 89 = (setpriority) */
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no_sys, /* 90 = (gettimeofday) */
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no_sys, /* 91 = (seteuid) */
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no_sys, /* 92 = (setegid) */
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do_truncate, /* 93 = truncate */
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do_ftruncate, /* 94 = truncate */
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do_chmod, /* 95 = fchmod */
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do_chown, /* 96 = fchown */
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no_sys, /* 97 = unused */
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no_sys, /* 98 = (sprofile) */
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no_sys, /* 99 = (cprofile) */
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no_sys, /* 100 = (exec_newmem) */
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no_sys, /* 101 = (srv_fork) */
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no_sys, /* 102 = (exec_restart) */
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no_sys, /* 103 = (procstat) */
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no_sys, /* 104 = (getprocnr) */
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no_sys, /* 105 = unused */
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no_sys, /* 106 = unused */
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no_sys, /* 107 = (getepinfo) */
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no_sys, /* 108 = (adddma) */
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no_sys, /* 109 = (deldma) */
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no_sys, /* 110 = (getdma) */
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no_sys, /* 111 = (srv_kill) */
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do_gcov_flush, /* 112 = gcov_flush */
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no_sys, /* 113 = (getsid) */
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};
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/* This should not fail with "array size is negative": */
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extern int dummy[sizeof(call_vec) == NCALLS * sizeof(call_vec[0]) ? 1 : -1];
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PUBLIC _PROTOTYPE (int (*pfs_call_vec[]), (void) ) = {
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no_sys, /* 0 */
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do_check_perms, /* 1 */
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do_verify_fd, /* 2 */
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do_set_filp, /* 3 */
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do_copy_filp, /* 4 */
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do_put_filp, /* 5 */
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do_cancel_fd /* 6 */
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};
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