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#include "driver.h" |
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#include "vfork.h" |
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|
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#ifndef DEVPATH |
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#define DEVPATH getenv("PATH") /* device search path */ |
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#endif |
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#ifndef DELAY |
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#define DELAY 20 /* seconds to wait for response */ |
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#endif |
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|
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#ifndef BSD |
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#define vfork fork |
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#endif |
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|
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extern char *getpath(), *getenv(); |
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|
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int onsigio(); |
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|
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int comm_close(), comm_clear(), comm_paintr(), comm_errout(), |
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static int comm_close(), comm_clear(), comm_paintr(), |
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comm_getcur(), comm_comout(), comm_comin(), comm_flush(); |
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struct driver comm_driver = { |
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int devchild; |
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static struct driver * |
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final_connect() /* verify and initialize connection */ |
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{ |
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putw(COM_SENDM, devout); |
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fflush(devout); |
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if (getw(devin) != COM_RECVM) |
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return(NULL); |
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/* get driver parameters */ |
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getstate(); |
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/* set error vectors */ |
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cmdvec = comm_comout; |
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if (wrnvec != NULL) |
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wrnvec = comm_comout; |
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return(&comm_driver); |
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} |
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|
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struct driver * |
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slave_init(dname, id) /* run rview in slave mode */ |
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char *dname, *id; |
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{ |
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devchild = -1; /* we're the slave here */ |
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devout = stdout; /* use standard input */ |
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devin = stdin; /* and standard output */ |
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return(final_connect()); /* verify initialization */ |
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} |
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struct driver * |
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comm_init(dname, id) /* set up and execute driver */ |
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char *dname, *id; |
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{ |
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int p1[2], p2[2]; |
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char pin[16], pout[16]; |
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/* find driver program */ |
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if ((devname = getpath(dname, DEVPATH, 1)) == NULL) { |
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if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
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stderr_v(dname); |
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stderr_v(": not found\n"); |
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return(NULL); |
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goto syserr; |
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if ((devin = fdopen(p2[0], "r")) == NULL) |
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goto syserr; |
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/* verify initialization */ |
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putw(COM_SENDM, devout); |
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fflush(devout); |
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if (getw(devin) != COM_RECVM) |
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return(NULL); |
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/* get driver parameters */ |
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comm_flush(); |
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/* set error vectors */ |
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cmdvec = comm_comout; |
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if (wrnvec != NULL) |
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wrnvec = comm_comout; |
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return(&comm_driver); |
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return(final_connect()); /* verify initialization */ |
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syserr: |
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perror(dname); |
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return(NULL); |
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wrnvec = stderr_v; |
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fclose(devout); |
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fclose(devin); |
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if (devchild < 0) |
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return; |
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while ((pid = wait(0)) != -1 && pid != devchild) |
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; |
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} |
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fflush(devout); |
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if (getc(devin) != COM_FLUSH) |
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reply_error("flush"); |
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fread((char *)&comm_driver.pixaspect, |
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sizeof(comm_driver.pixaspect), 1, devin); |
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comm_driver.xsiz = getw(devin); |
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comm_driver.ysiz = getw(devin); |
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comm_driver.inpready = getw(devin); |
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getstate(); |
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} |
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{ |
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putc(COM_COMOUT, devout); |
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myputs(str, devout); |
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if (str[strlen(str)-1] == '\n') |
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fflush(devout); |
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} |
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if (getc(devin) != COM_COMIN) |
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reply_error("comin"); |
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mygets(buf, devin); |
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comm_driver.inpready = getw(devin); |
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getstate(); |
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} |
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static |
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comm_errout(str) /* display an error message */ |
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char *str; |
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{ |
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comm_comout(str); |
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stderr_v(str); /* send to standard error also */ |
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} |
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|
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|
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static |
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mygets(s, fp) /* get string from file (with nul) */ |
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register char *s; |
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register FILE *fp; |
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stderr_v(routine); |
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stderr_v(": driver reply error\n"); |
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quit(1); |
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} |
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|
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|
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static |
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getstate() /* get driver state variables */ |
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{ |
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fread((char *)&comm_driver.pixaspect, |
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sizeof(comm_driver.pixaspect), 1, devin); |
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comm_driver.xsiz = getw(devin); |
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comm_driver.ysiz = getw(devin); |
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comm_driver.inpready = getw(devin); |
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} |