958b25be50
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
83 lines
3.9 KiB
C
83 lines
3.9 KiB
C
/* This table has one slot per process. It contains all the process management
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* information for each process. Among other things, it defines the text, data
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* and stack segments, uids and gids, and various flags. The kernel and file
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* systems have tables that are also indexed by process, with the contents
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* of corresponding slots referring to the same process in all three.
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*/
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#include <limits.h>
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#include <timers.h>
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#include <signal.h>
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/* Needs to be included here, for 'ps' etc */
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#include "const.h"
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EXTERN struct mproc {
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char mp_exitstatus; /* storage for status when process exits */
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char mp_sigstatus; /* storage for signal # for killed procs */
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pid_t mp_pid; /* process id */
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endpoint_t mp_endpoint; /* kernel endpoint id */
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pid_t mp_procgrp; /* pid of process group (used for signals) */
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pid_t mp_wpid; /* pid this process is waiting for */
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int mp_parent; /* index of parent process */
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int mp_tracer; /* index of tracer process, or NO_TRACER */
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/* Child user and system times. Accounting done on child exit. */
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clock_t mp_child_utime; /* cumulative user time of children */
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clock_t mp_child_stime; /* cumulative sys time of children */
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/* Real and effective uids and gids. */
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uid_t mp_realuid; /* process' real uid */
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uid_t mp_effuid; /* process' effective uid */
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gid_t mp_realgid; /* process' real gid */
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gid_t mp_effgid; /* process' effective gid */
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/* Supplemental groups. */
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int mp_ngroups; /* number of supplemental groups */
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gid_t mp_sgroups[NGROUPS_MAX];/* process' supplemental groups */
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/* Signal handling information. */
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sigset_t mp_ignore; /* 1 means ignore the signal, 0 means don't */
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sigset_t mp_catch; /* 1 means catch the signal, 0 means don't */
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sigset_t mp_sig2mess; /* 1 means transform into notify message */
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sigset_t mp_sigmask; /* signals to be blocked */
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sigset_t mp_sigmask2; /* saved copy of mp_sigmask */
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sigset_t mp_sigpending; /* pending signals to be handled */
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sigset_t mp_sigtrace; /* signals to hand to tracer first */
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struct sigaction mp_sigact[_NSIG]; /* as in sigaction(2) */
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vir_bytes mp_sigreturn; /* address of C library __sigreturn function */
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struct timer mp_timer; /* watchdog timer for alarm(2), setitimer(2) */
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clock_t mp_interval[NR_ITIMERS]; /* setitimer(2) repetition intervals */
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unsigned mp_flags; /* flag bits */
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unsigned mp_trace_flags; /* trace options */
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vir_bytes mp_procargs; /* ptr to proc's initial stack arguments */
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message mp_reply; /* reply message to be sent to one */
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/* Scheduling priority. */
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signed int mp_nice; /* nice is PRIO_MIN..PRIO_MAX, standard 0. */
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char mp_name[PROC_NAME_LEN]; /* process name */
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} mproc[NR_PROCS];
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/* Flag values */
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#define IN_USE 0x00001 /* set when 'mproc' slot in use */
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#define WAITING 0x00002 /* set by WAIT system call */
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#define ZOMBIE 0x00004 /* waiting for parent to issue WAIT call */
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#define PAUSED 0x00008 /* set by PAUSE system call */
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#define ALARM_ON 0x00010 /* set when SIGALRM timer started */
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#define EXITING 0x00020 /* set by EXIT, process is now exiting */
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#define TOLD_PARENT 0x00040 /* parent wait() completed, ZOMBIE off */
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#define STOPPED 0x00080 /* set if process stopped for tracing */
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#define SIGSUSPENDED 0x00100 /* set by SIGSUSPEND system call */
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#define REPLY 0x00200 /* set if a reply message is pending */
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#define FS_CALL 0x00400 /* set if waiting for FS (normal calls) */
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#define PM_SIG_PENDING 0x00800 /* process got a signal while waiting for FS */
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#define UNPAUSED 0x01000 /* process is not in a blocking call */
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#define PRIV_PROC 0x02000 /* system process, special privileges */
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#define PARTIAL_EXEC 0x04000 /* process got a new map but no content */
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#define TRACE_EXIT 0x08000 /* tracer is forcing this process to exit */
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#define TRACE_ZOMBIE 0x10000 /* waiting for tracer to issue WAIT call */
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#define DELAY_CALL 0x20000 /* waiting for call before sending signal */
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#define NIL_MPROC ((struct mproc *) 0)
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