. When drivers disappear that have pending select()s, wake up those user processes with EAGAIN so that they can retry their select() and won't hang forever on it. . When drivers re-appear and are mapped into the dmap, run through the list of mounted filesystems and re-dev_open() every one (for partition tables and such). This can't happen before the driver has exec()ced itself, so processes that have fork()ed but not exec()ced yet are marked as DMAP_BABY in the dmap table if they are dmapped before they are execced. If that happens, the above procedure happens after the exec(). If the exec() happens before the dmapping, it (the dev_open()ing) happens right away.
703 lines
19 KiB
C
703 lines
19 KiB
C
/* Implement entry point to select system call.
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*
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* The entry points into this file are
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* do_select: perform the SELECT system call
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* select_callback: notify select system of possible fd operation
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* select_notified: low-level entry for device notifying select
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* select_unsuspend_by_proc: cancel a blocking select on exiting driver
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*
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* Changes:
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* 6 june 2005 Created (Ben Gras)
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*/
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#define DEBUG_SELECT 0
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#include "fs.h"
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#include "select.h"
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#include "file.h"
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#include "inode.h"
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#include <sys/time.h>
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#include <sys/select.h>
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#include <minix/com.h>
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#include <string.h>
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/* max. number of simultaneously pending select() calls */
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#define MAXSELECTS 25
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PRIVATE struct selectentry {
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struct fproc *requestor; /* slot is free iff this is NULL */
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int req_procnr;
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fd_set readfds, writefds, errorfds;
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fd_set ready_readfds, ready_writefds, ready_errorfds;
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fd_set *vir_readfds, *vir_writefds, *vir_errorfds;
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struct filp *filps[FD_SETSIZE];
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int type[FD_SETSIZE];
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int nfds, nreadyfds;
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clock_t expiry;
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timer_t timer; /* if expiry > 0 */
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} selecttab[MAXSELECTS];
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#define SELFD_FILE 0
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#define SELFD_PIPE 1
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#define SELFD_TTY 2
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#define SELFD_INET 3
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#define SELFD_LOG 4
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#define SEL_FDS 5
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FORWARD _PROTOTYPE(int select_reevaluate, (struct filp *fp));
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FORWARD _PROTOTYPE(int select_request_file,
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(struct filp *f, int *ops, int block));
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FORWARD _PROTOTYPE(int select_match_file, (struct filp *f));
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FORWARD _PROTOTYPE(int select_request_general,
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(struct filp *f, int *ops, int block));
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FORWARD _PROTOTYPE(int select_major_match,
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(int match_major, struct filp *file));
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FORWARD _PROTOTYPE(void select_cancel_all, (struct selectentry *e));
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FORWARD _PROTOTYPE(void select_wakeup, (struct selectentry *e, int r));
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FORWARD _PROTOTYPE(void select_return, (struct selectentry *, int));
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/* The Open Group:
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* "The pselect() and select() functions shall support
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* regular files, terminal and pseudo-terminal devices,
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* STREAMS-based files, FIFOs, pipes, and sockets."
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*/
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PRIVATE struct fdtype {
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int (*select_request)(struct filp *, int *ops, int block);
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int (*select_match)(struct filp *);
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int select_major;
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} fdtypes[SEL_FDS] = {
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/* SELFD_FILE */
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{ select_request_file, select_match_file, 0 },
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/* SELFD_TTY (also PTY) */
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{ select_request_general, NULL, TTY_MAJOR },
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/* SELFD_INET */
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{ select_request_general, NULL, INET_MAJOR },
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/* SELFD_PIPE (pipe(2) pipes and FS FIFOs) */
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{ select_request_pipe, select_match_pipe, 0 },
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/* SELFD_LOG (/dev/klog) */
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{ select_request_general, NULL, LOG_MAJOR },
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};
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/* Open Group:
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* "File descriptors associated with regular files shall always select true
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* for ready to read, ready to write, and error conditions."
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*/
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/*===========================================================================*
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* select_request_file *
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*===========================================================================*/
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PRIVATE int select_request_file(struct filp *f, int *ops, int block)
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{
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/* output *ops is input *ops */
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return SEL_OK;
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}
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/*===========================================================================*
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* select_match_file *
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*===========================================================================*/
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PRIVATE int select_match_file(struct filp *file)
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{
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if (file && file->filp_ino && (file->filp_ino->i_mode & I_REGULAR))
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return 1;
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return 0;
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}
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/*===========================================================================*
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* select_request_general *
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*===========================================================================*/
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PRIVATE int select_request_general(struct filp *f, int *ops, int block)
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{
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int rops = *ops;
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if (block) rops |= SEL_NOTIFY;
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*ops = dev_io(DEV_SELECT, f->filp_ino->i_zone[0], rops, NULL, 0, 0, 0);
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if (*ops < 0)
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return SEL_ERR;
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return SEL_OK;
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}
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/*===========================================================================*
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* select_major_match *
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*===========================================================================*/
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PRIVATE int select_major_match(int match_major, struct filp *file)
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{
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int major;
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if (!(file && file->filp_ino &&
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(file->filp_ino->i_mode & I_TYPE) == I_CHAR_SPECIAL))
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return 0;
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major = (file->filp_ino->i_zone[0] >> MAJOR) & BYTE;
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if (major == match_major)
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return 1;
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return 0;
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}
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/*===========================================================================*
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* tab2ops *
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*===========================================================================*/
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PRIVATE int tab2ops(int fd, struct selectentry *e)
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{
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return (FD_ISSET(fd, &e->readfds) ? SEL_RD : 0) |
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(FD_ISSET(fd, &e->writefds) ? SEL_WR : 0) |
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(FD_ISSET(fd, &e->errorfds) ? SEL_ERR : 0);
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}
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/*===========================================================================*
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* ops2tab *
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*===========================================================================*/
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PRIVATE void ops2tab(int ops, int fd, struct selectentry *e)
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{
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if ((ops & SEL_RD) && e->vir_readfds && FD_ISSET(fd, &e->readfds)
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&& !FD_ISSET(fd, &e->ready_readfds)) {
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FD_SET(fd, &e->ready_readfds);
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e->nreadyfds++;
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}
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if ((ops & SEL_WR) && e->vir_writefds && FD_ISSET(fd, &e->writefds)
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&& !FD_ISSET(fd, &e->ready_writefds)) {
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FD_SET(fd, &e->ready_writefds);
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e->nreadyfds++;
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}
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if ((ops & SEL_ERR) && e->vir_errorfds && FD_ISSET(fd, &e->errorfds)
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&& !FD_ISSET(fd, &e->ready_errorfds)) {
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FD_SET(fd, &e->ready_errorfds);
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e->nreadyfds++;
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}
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return;
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}
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/*===========================================================================*
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* copy_fdsets *
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*===========================================================================*/
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PRIVATE void copy_fdsets(struct selectentry *e)
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{
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if (e->vir_readfds)
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sys_vircopy(SELF, D, (vir_bytes) &e->ready_readfds,
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e->req_procnr, D, (vir_bytes) e->vir_readfds, sizeof(fd_set));
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if (e->vir_writefds)
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sys_vircopy(SELF, D, (vir_bytes) &e->ready_writefds,
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e->req_procnr, D, (vir_bytes) e->vir_writefds, sizeof(fd_set));
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if (e->vir_errorfds)
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sys_vircopy(SELF, D, (vir_bytes) &e->ready_errorfds,
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e->req_procnr, D, (vir_bytes) e->vir_errorfds, sizeof(fd_set));
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return;
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}
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/*===========================================================================*
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* do_select *
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*===========================================================================*/
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PUBLIC int do_select(void)
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{
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int r, nfds, is_timeout = 1, nonzero_timeout = 0,
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fd, s, block = 0;
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struct timeval timeout;
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nfds = m_in.SEL_NFDS;
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if (nfds < 0 || nfds > FD_SETSIZE)
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return EINVAL;
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for(s = 0; s < MAXSELECTS; s++)
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if (!selecttab[s].requestor)
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break;
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if (s >= MAXSELECTS)
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return ENOSPC;
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selecttab[s].req_procnr = who;
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selecttab[s].nfds = 0;
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selecttab[s].nreadyfds = 0;
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memset(selecttab[s].filps, 0, sizeof(selecttab[s].filps));
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/* defaults */
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FD_ZERO(&selecttab[s].readfds);
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FD_ZERO(&selecttab[s].writefds);
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FD_ZERO(&selecttab[s].errorfds);
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FD_ZERO(&selecttab[s].ready_readfds);
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FD_ZERO(&selecttab[s].ready_writefds);
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FD_ZERO(&selecttab[s].ready_errorfds);
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selecttab[s].vir_readfds = (fd_set *) m_in.SEL_READFDS;
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selecttab[s].vir_writefds = (fd_set *) m_in.SEL_WRITEFDS;
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selecttab[s].vir_errorfds = (fd_set *) m_in.SEL_ERRORFDS;
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/* copy args */
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if (selecttab[s].vir_readfds
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&& (r=sys_vircopy(who, D, (vir_bytes) m_in.SEL_READFDS,
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SELF, D, (vir_bytes) &selecttab[s].readfds, sizeof(fd_set))) != OK)
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return r;
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if (selecttab[s].vir_writefds
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&& (r=sys_vircopy(who, D, (vir_bytes) m_in.SEL_WRITEFDS,
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SELF, D, (vir_bytes) &selecttab[s].writefds, sizeof(fd_set))) != OK)
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return r;
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if (selecttab[s].vir_errorfds
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&& (r=sys_vircopy(who, D, (vir_bytes) m_in.SEL_ERRORFDS,
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SELF, D, (vir_bytes) &selecttab[s].errorfds, sizeof(fd_set))) != OK)
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return r;
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if (!m_in.SEL_TIMEOUT)
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is_timeout = nonzero_timeout = 0;
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else
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if ((r=sys_vircopy(who, D, (vir_bytes) m_in.SEL_TIMEOUT,
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SELF, D, (vir_bytes) &timeout, sizeof(timeout))) != OK)
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return r;
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/* No nonsense in the timeval please. */
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if (is_timeout && (timeout.tv_sec < 0 || timeout.tv_usec < 0))
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return EINVAL;
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/* if is_timeout if 0, we block forever. otherwise, if nonzero_timeout
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* is 0, we do a poll (don't block). otherwise, we block up to the
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* specified time interval.
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*/
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if (is_timeout && (timeout.tv_sec > 0 || timeout.tv_usec > 0))
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nonzero_timeout = 1;
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if (nonzero_timeout || !is_timeout)
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block = 1;
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else
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block = 0; /* timeout set as (0,0) - this effects a poll */
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/* no timeout set (yet) */
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selecttab[s].expiry = 0;
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for(fd = 0; fd < nfds; fd++) {
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int orig_ops, ops, t, type = -1, r;
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struct filp *filp;
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if (!(orig_ops = ops = tab2ops(fd, &selecttab[s])))
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continue;
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if (!(filp = selecttab[s].filps[fd] = get_filp(fd))) {
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select_cancel_all(&selecttab[s]);
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return EBADF;
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}
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for(t = 0; t < SEL_FDS; t++) {
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if (fdtypes[t].select_match) {
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if (fdtypes[t].select_match(filp)) {
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#if DEBUG_SELECT
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printf("select: fd %d is type %d ", fd, t);
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#endif
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if (type != -1)
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printf("select: double match\n");
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type = t;
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}
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} else if (select_major_match(fdtypes[t].select_major, filp)) {
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type = t;
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}
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}
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/* Open Group:
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* "The pselect() and select() functions shall support
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* regular files, terminal and pseudo-terminal devices,
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* STREAMS-based files, FIFOs, pipes, and sockets. The
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* behavior of pselect() and select() on file descriptors
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* that refer to other types of file is unspecified."
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*
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* If all types are implemented, then this is another
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* type of file and we get to do whatever we want.
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*/
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if (type == -1)
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{
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#if DEBUG_SELECT
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printf("do_select: bad type\n");
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#endif
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return EBADF;
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}
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selecttab[s].type[fd] = type;
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if ((selecttab[s].filps[fd]->filp_select_ops & ops) != ops) {
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int wantops;
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/* Request the select on this fd. */
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#if DEBUG_SELECT
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printf("%p requesting ops %d -> ",
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selecttab[s].filps[fd],
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selecttab[s].filps[fd]->filp_select_ops);
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#endif
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wantops = (selecttab[s].filps[fd]->filp_select_ops |= ops);
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#if DEBUG_SELECT
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printf("%d\n", selecttab[s].filps[fd]->filp_select_ops);
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#endif
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if ((r = fdtypes[type].select_request(filp,
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&wantops, block)) != SEL_OK) {
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/* error or bogus return code.. backpaddle */
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select_cancel_all(&selecttab[s]);
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printf("select: select_request returned error\n");
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return EINVAL;
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}
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if (wantops) {
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if (wantops & ops) {
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/* operations that were just requested
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* are ready to go right away
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*/
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ops2tab(wantops, fd, &selecttab[s]);
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}
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/* if there are any other select()s blocking
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* on these operations of this fp, they can
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* be awoken too
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*/
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select_callback(filp, ops);
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}
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#if DEBUG_SELECT
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printf("select request ok; ops returned %d\n", wantops);
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#endif
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} else {
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#if DEBUG_SELECT
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printf("select already happening on that filp\n");
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#endif
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}
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selecttab[s].nfds = fd+1;
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selecttab[s].filps[fd]->filp_selectors++;
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#if DEBUG_SELECT
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printf("[fd %d ops: %d] ", fd, ops);
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#endif
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}
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if (selecttab[s].nreadyfds > 0 || !block) {
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/* fd's were found that were ready to go right away, and/or
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* we were instructed not to block at all. Must return
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* immediately.
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*/
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copy_fdsets(&selecttab[s]);
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select_cancel_all(&selecttab[s]);
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selecttab[s].requestor = NULL;
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/* Open Group:
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* "Upon successful completion, the pselect() and select()
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* functions shall return the total number of bits
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* set in the bit masks."
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*/
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#if DEBUG_SELECT
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printf("returning\n");
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#endif
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return selecttab[s].nreadyfds;
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}
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#if DEBUG_SELECT
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printf("not returning (%d, %d)\n", selecttab[s].nreadyfds, block);
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#endif
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/* Convert timeval to ticks and set the timer. If it fails, undo
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* all, return error.
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*/
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if (is_timeout) {
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int ticks;
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/* Open Group:
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* "If the requested timeout interval requires a finer
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* granularity than the implementation supports, the
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* actual timeout interval shall be rounded up to the next
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* supported value."
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*/
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#define USECPERSEC 1000000
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while(timeout.tv_usec >= USECPERSEC) {
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/* this is to avoid overflow with *HZ below */
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timeout.tv_usec -= USECPERSEC;
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timeout.tv_sec++;
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}
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ticks = timeout.tv_sec * HZ +
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(timeout.tv_usec * HZ + USECPERSEC-1) / USECPERSEC;
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selecttab[s].expiry = ticks;
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fs_set_timer(&selecttab[s].timer, ticks, select_timeout_check, s);
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#if DEBUG_SELECT
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printf("%d: blocking %d ticks\n", s, ticks);
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#endif
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}
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/* if we're blocking, the table entry is now valid. */
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selecttab[s].requestor = fp;
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/* process now blocked */
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suspend(XSELECT);
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return SUSPEND;
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}
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/*===========================================================================*
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* select_cancel_all *
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*===========================================================================*/
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PRIVATE void select_cancel_all(struct selectentry *e)
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{
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int fd;
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for(fd = 0; fd < e->nfds; fd++) {
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struct filp *fp;
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fp = e->filps[fd];
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if (!fp) {
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#if DEBUG_SELECT
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printf("[ fd %d/%d NULL ] ", fd, e->nfds);
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#endif
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continue;
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}
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if (fp->filp_selectors < 1) {
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#if DEBUG_SELECT
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printf("select: %d selectors?!\n", fp->filp_selectors);
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#endif
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continue;
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}
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fp->filp_selectors--;
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e->filps[fd] = NULL;
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select_reevaluate(fp);
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}
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if (e->expiry > 0) {
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#if DEBUG_SELECT
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printf("cancelling timer %d\n", e - selecttab);
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#endif
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fs_cancel_timer(&e->timer);
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e->expiry = 0;
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}
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return;
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}
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|
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/*===========================================================================*
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* select_wakeup *
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*===========================================================================*/
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PRIVATE void select_wakeup(struct selectentry *e, int r)
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{
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revive(e->req_procnr, r);
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}
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/*===========================================================================*
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* select_reevaluate *
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*===========================================================================*/
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PRIVATE int select_reevaluate(struct filp *fp)
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{
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int s, remain_ops = 0, fd, type = -1;
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if (!fp) {
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printf("fs: select: reevalute NULL fp\n");
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return 0;
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}
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for(s = 0; s < MAXSELECTS; s++) {
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if (!selecttab[s].requestor)
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continue;
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for(fd = 0; fd < selecttab[s].nfds; fd++)
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if (fp == selecttab[s].filps[fd]) {
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remain_ops |= tab2ops(fd, &selecttab[s]);
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type = selecttab[s].type[fd];
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}
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}
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/* If there are any select()s open that want any operations on
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|
* this fd that haven't been satisfied by this callback, then we're
|
|
* still in the market for it.
|
|
*/
|
|
fp->filp_select_ops = remain_ops;
|
|
#if DEBUG_SELECT
|
|
printf("remaining operations on fp are %d\n", fp->filp_select_ops);
|
|
#endif
|
|
|
|
return remain_ops;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_return *
|
|
*===========================================================================*/
|
|
PRIVATE void select_return(struct selectentry *s, int r)
|
|
{
|
|
select_cancel_all(s);
|
|
copy_fdsets(s);
|
|
select_wakeup(s, r ? r : s->nreadyfds);
|
|
s->requestor = NULL;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_callback *
|
|
*===========================================================================*/
|
|
PUBLIC int select_callback(struct filp *fp, int ops)
|
|
{
|
|
int s, fd, want_ops, type;
|
|
|
|
/* We are being notified that file pointer fp is available for
|
|
* operations 'ops'. We must re-register the select for
|
|
* operations that we are still interested in, if any.
|
|
*/
|
|
|
|
want_ops = 0;
|
|
type = -1;
|
|
for(s = 0; s < MAXSELECTS; s++) {
|
|
int wakehim = 0;
|
|
if (!selecttab[s].requestor)
|
|
continue;
|
|
for(fd = 0; fd < selecttab[s].nfds; fd++) {
|
|
if (!selecttab[s].filps[fd])
|
|
continue;
|
|
if (selecttab[s].filps[fd] == fp) {
|
|
int this_want_ops;
|
|
this_want_ops = tab2ops(fd, &selecttab[s]);
|
|
want_ops |= this_want_ops;
|
|
if (this_want_ops & ops) {
|
|
/* this select() has been satisfied. */
|
|
ops2tab(ops, fd, &selecttab[s]);
|
|
wakehim = 1;
|
|
}
|
|
type = selecttab[s].type[fd];
|
|
}
|
|
}
|
|
if (wakehim)
|
|
select_return(&selecttab[s], 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_notified *
|
|
*===========================================================================*/
|
|
PUBLIC int select_notified(int major, int minor, int selected_ops)
|
|
{
|
|
int s, f, t;
|
|
|
|
#if DEBUG_SELECT
|
|
printf("select callback: %d, %d: %d\n", major, minor, selected_ops);
|
|
#endif
|
|
|
|
for(t = 0; t < SEL_FDS; t++)
|
|
if (!fdtypes[t].select_match && fdtypes[t].select_major == major)
|
|
break;
|
|
|
|
if (t >= SEL_FDS) {
|
|
#if DEBUG_SELECT
|
|
printf("select callback: no fdtype found for device %d\n", major);
|
|
#endif
|
|
return OK;
|
|
}
|
|
|
|
/* We have a select callback from major device no.
|
|
* d, which corresponds to our select type t.
|
|
*/
|
|
|
|
for(s = 0; s < MAXSELECTS; s++) {
|
|
int s_minor, ops;
|
|
if (!selecttab[s].requestor)
|
|
continue;
|
|
for(f = 0; f < selecttab[s].nfds; f++) {
|
|
if (!selecttab[s].filps[f] ||
|
|
!select_major_match(major, selecttab[s].filps[f]))
|
|
continue;
|
|
ops = tab2ops(f, &selecttab[s]);
|
|
s_minor =
|
|
(selecttab[s].filps[f]->filp_ino->i_zone[0] >> MINOR)
|
|
& BYTE;
|
|
if ((s_minor == minor) &&
|
|
(selected_ops & ops)) {
|
|
select_callback(selecttab[s].filps[f], (selected_ops & ops));
|
|
}
|
|
}
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* init_select *
|
|
*===========================================================================*/
|
|
PUBLIC void init_select(void)
|
|
{
|
|
int s;
|
|
|
|
for(s = 0; s < MAXSELECTS; s++)
|
|
fs_init_timer(&selecttab[s].timer);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_forget *
|
|
*===========================================================================*/
|
|
PUBLIC void select_forget(int proc)
|
|
{
|
|
/* something has happened (e.g. signal delivered that interrupts
|
|
* select()). totally forget about the select().
|
|
*/
|
|
int s;
|
|
|
|
for(s = 0; s < MAXSELECTS; s++) {
|
|
if (selecttab[s].requestor &&
|
|
selecttab[s].req_procnr == proc) {
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
if (s >= MAXSELECTS) {
|
|
#if DEBUG_SELECT
|
|
printf("select: cancelled select() not found");
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
select_cancel_all(&selecttab[s]);
|
|
selecttab[s].requestor = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_timeout_check *
|
|
*===========================================================================*/
|
|
PUBLIC void select_timeout_check(timer_t *timer)
|
|
{
|
|
int s;
|
|
|
|
s = tmr_arg(timer)->ta_int;
|
|
|
|
if (s < 0 || s >= MAXSELECTS) {
|
|
#if DEBUG_SELECT
|
|
printf("select: bogus slot arg to watchdog %d\n", s);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
if (!selecttab[s].requestor) {
|
|
#if DEBUG_SELECT
|
|
printf("select: no requestor in watchdog\n");
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
if (selecttab[s].expiry <= 0) {
|
|
#if DEBUG_SELECT
|
|
printf("select: strange expiry value in watchdog\n", s);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
selecttab[s].expiry = 0;
|
|
select_return(&selecttab[s], 0);
|
|
|
|
return;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* select_unsuspend_by_proc *
|
|
*===========================================================================*/
|
|
PUBLIC void select_unsuspend_by_proc(int proc)
|
|
{
|
|
struct filp *fp;
|
|
int fd, s;
|
|
|
|
for(s = 0; s < MAXSELECTS; s++) {
|
|
if (!selecttab[s].requestor)
|
|
continue;
|
|
for(fd = 0; fd < selecttab[s].nfds; fd++) {
|
|
int maj;
|
|
if (!selecttab[s].filps[fd] || !selecttab[s].filps[fd]->filp_ino)
|
|
continue;
|
|
maj = (selecttab[s].filps[fd]->filp_ino->i_zone[0] >> MAJOR)&BYTE;
|
|
if(dmap_driver_match(proc, maj)) {
|
|
select_return(&selecttab[s], EAGAIN);
|
|
}
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|