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#ifndef lint |
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static const char RCSid[] = "$Id: devcomm.c,v 2.12 2004/03/30 16:13:01 schorsch Exp $"; |
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#endif |
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/* |
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* devcomm.c - communication routines for separate drivers. |
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* |
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* External symbols declared in driver.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <sys/types.h> |
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#include <sys/wait.h> /* XXX platform specific */ |
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|
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#include "platform.h" |
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#include "standard.h" |
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#include "driver.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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|
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FILE *devin, *devout; |
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int devchild; |
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|
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static struct driver * final_connect(void); |
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static void mygets(char *s, FILE *fp); |
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static void myputs(char *s, FILE *fp); |
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static void reply_error(char *routine); |
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static void getstate(void); |
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|
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static dr_closef_t comm_close; |
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static dr_clearf_t comm_clear; |
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static dr_paintrf_t comm_paintr; |
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static dr_getcurf_t comm_getcur; |
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static dr_comoutf_t comm_comout; |
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static dr_cominf_t comm_comin; |
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static dr_flushf_t comm_flush; |
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|
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struct driver comm_driver = { |
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comm_close, comm_clear, comm_paintr, comm_getcur, |
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comm_comout, comm_comin, comm_flush |
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}; |
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|
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|
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static struct driver * |
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final_connect(void) /* 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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erract[COMMAND].pf = comm_comout; |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = comm_comout; |
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return(&comm_driver); |
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} |
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|
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|
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extern struct driver * |
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slave_init( /* run rview in slave mode */ |
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char *dname, |
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char *id |
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) |
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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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|
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|
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extern struct driver * |
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comm_init( /* set up and execute driver */ |
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char *dname, |
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char *id |
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) |
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{ |
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char *dvcname; |
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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 ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
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eputs(dname); |
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eputs(": not found\n"); |
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return(NULL); |
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} |
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#ifdef RHAS_FORK_EXEC |
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/* open communication pipes */ |
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if (pipe(p1) == -1 || pipe(p2) == -1) |
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goto syserr; |
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if ((devchild = fork()) == 0) { /* fork driver process */ |
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close(p1[1]); |
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close(p2[0]); |
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sprintf(pin, "%d", p1[0]); |
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sprintf(pout, "%d", p2[1]); |
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execl(dvcname, dname, pin, pout, id, 0); |
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perror(dvcname); |
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_exit(127); |
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} |
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if (devchild == -1) |
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goto syserr; |
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close(p1[0]); |
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close(p2[1]); |
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/* |
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* Close write stream on exec to avoid multiprocessing deadlock. |
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* No use in read stream without it, so set flag there as well. |
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*/ |
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fcntl(p1[1], F_SETFD, FD_CLOEXEC); |
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fcntl(p2[0], F_SETFD, FD_CLOEXEC); |
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if ((devout = fdopen(p1[1], "w")) == 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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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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|
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#else /* ! RHAS_FORK_EXEC */ |
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|
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eputs(dname); |
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eputs(": no fork/exec\n"); |
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return(NULL); |
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|
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#endif /* ! RHAS_FORK_EXEC */ |
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} |
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|
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|
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static void |
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comm_close(void) /* done with driver */ |
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{ |
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int pid; |
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|
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erract[COMMAND].pf = NULL; /* reset error vectors */ |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = wputs; |
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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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|
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|
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static void |
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comm_clear( /* clear screen */ |
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int xres, |
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int yres |
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) |
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{ |
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putc(COM_CLEAR, devout); |
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putw(xres, devout); |
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putw(yres, devout); |
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fflush(devout); |
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} |
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|
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|
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static void |
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comm_paintr( /* paint a rectangle */ |
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COLOR col, |
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int xmin, |
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int ymin, |
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int xmax, |
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int ymax |
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) |
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{ |
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putc(COM_PAINTR, devout); |
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fwrite((char *)col, sizeof(COLOR), 1, devout); |
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putw(xmin, devout); |
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putw(ymin, devout); |
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putw(xmax, devout); |
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putw(ymax, devout); |
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} |
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|
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|
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static void |
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comm_flush(void) /* flush output to driver */ |
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{ |
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putc(COM_FLUSH, devout); |
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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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getstate(); |
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} |
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|
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|
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static int |
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comm_getcur( /* get and return cursor position */ |
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int *xp, |
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int *yp |
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) |
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{ |
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int c; |
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|
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putc(COM_GETCUR, devout); |
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fflush(devout); |
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if (getc(devin) != COM_GETCUR) |
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reply_error("getcur"); |
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c = getc(devin); |
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*xp = getw(devin); |
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*yp = getw(devin); |
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return(c); |
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} |
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|
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|
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static void |
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comm_comout( /* print string to command line */ |
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char *str |
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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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|
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|
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static void |
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comm_comin( /* read string from command line */ |
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char *buf, |
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char *prompt |
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) |
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{ |
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putc(COM_COMIN, devout); |
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if (prompt == NULL) |
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putc(0, devout); |
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else { |
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putc(1, devout); |
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myputs(prompt, devout); |
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} |
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fflush(devout); |
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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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getstate(); |
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} |
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|
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|
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static void |
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mygets( /* get string from file (with nul) */ |
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register char *s, |
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register FILE *fp |
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) |
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{ |
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register int c; |
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|
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while ((c = getc(fp)) != EOF) |
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if ((*s++ = c) == '\0') |
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return; |
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*s = '\0'; |
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} |
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|
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|
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static void |
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myputs( /* put string to file (with nul) */ |
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register char *s, |
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register FILE *fp |
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) |
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{ |
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do |
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putc(*s, fp); |
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while (*s++); |
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} |
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|
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|
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static void |
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reply_error( /* what should we do here? */ |
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char *routine |
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) |
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{ |
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eputs(routine); |
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eputs(": 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 void |
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getstate(void) /* 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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} |
