BSD 3 development

Work on file usr/src/cmd/write.c

Synthesized-from: 3bsd

diff --git a/usr/src/cmd/write.c b/usr/src/cmd/write.c
new file mode 100644 (file)
index 0000000..205ffb0
--- /dev/null
+++ b/usr/src/cmd/write.c
@@ -0,0 +1,191 @@
+/*
+ * write to another user
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <utmp.h>
+#include <time.h>
+
+char   *strcat();
+char   *strcpy();
+struct utmp ubuf;
+int    signum[] = {SIGHUP, SIGINT, SIGQUIT, 0};
+char   me[10]  = "???";
+char   *him;
+char   *mytty;
+char   histty[32];
+char   *histtya;
+char   *ttyname();
+char   *rindex();
+int    logcnt;
+int    eof();
+int    timout();
+FILE   *tf;
+char   *getenv();
+
+main(argc, argv)
+char *argv[];
+{
+       struct stat stbuf;
+       register i;
+       register FILE *uf;
+       int c1, c2;
+       long    clock = time( 0 );
+       struct tm *localtime();
+       struct tm *localclock = localtime( &clock );
+
+       if(argc < 2) {
+               printf("usage: write user [ttyname]\n");
+               exit(1);
+       }
+       him = argv[1];
+       if(argc > 2)
+               histtya = argv[2];
+       if ((uf = fopen("/etc/utmp", "r")) == NULL) {
+               printf("cannot open /etc/utmp\n");
+               goto cont;
+       }
+       mytty = ttyname(2);
+       if (mytty == NULL) {
+               printf("Can't find your tty\n");
+               exit(1);
+       }
+       mytty = rindex(mytty, '/') + 1;
+       if (histtya) {
+               strcpy(histty, "/dev/");
+               strcat(histty, histtya);
+       }
+       while (fread((char *)&ubuf, sizeof(ubuf), 1, uf) == 1) {
+               if (strcmp(ubuf.ut_line, mytty)==0) {
+                       for(i=0; i<8; i++) {
+                               c1 = ubuf.ut_name[i];
+                               if(c1 == ' ')
+                                       c1 = 0;
+                               me[i] = c1;
+                               if(c1 == 0)
+                                       break;
+                       }
+               }
+               if(him[0] != '-' || him[1] != 0)
+               for(i=0; i<8; i++) {
+                       c1 = him[i];
+                       c2 = ubuf.ut_name[i];
+                       if(c1 == 0)
+                               if(c2 == 0 || c2 == ' ')
+                                       break;
+                       if(c1 != c2)
+                               goto nomat;
+               }
+               logcnt++;
+               if (histty[0]==0) {
+                       strcpy(histty, "/dev/");
+                       strcat(histty, ubuf.ut_line);
+               }
+       nomat:
+               ;
+       }
+cont:
+       if (logcnt==0 && histty[0]=='\0') {
+               printf("%s not logged in.\n", him);
+               exit(1);
+       }
+       fclose(uf);
+       if (histtya==0 && logcnt > 1) {
+               printf("%s logged more than once\nwriting to %s\n", him, histty+5);
+       }
+       if(histty[0] == 0) {
+               printf(him);
+               if(logcnt)
+                       printf(" not on that tty\n"); else
+                       printf(" not logged in\n");
+               exit(1);
+       }
+       if (access(histty, 0) < 0) {
+               printf("No such tty\n");
+               exit(1);
+       }
+       signal(SIGALRM, timout);
+       alarm(5);
+       if ((tf = fopen(histty, "w")) == NULL)
+               goto perm;
+       alarm(0);
+       if (fstat(fileno(tf), &stbuf) < 0)
+               goto perm;
+       if ((stbuf.st_mode&02) == 0)
+               goto perm;
+       sigs(eof);
+       fprintf(tf, "\r\nMessage from ");
+#ifdef interdata
+       fprintf(tf, "(Interdata) " );
+#endif
+       fprintf(tf, "%s on %s at %d:%02d ...\r\n\a\a\a"
+              , me, mytty , localclock -> tm_hour , localclock -> tm_min );
+       fflush(tf);
+       for(;;) {
+               char buf[128];
+               i = read(0, buf, 128);
+               if(i <= 0)
+                       eof();
+               if(buf[0] == '!') {
+                       buf[i] = 0;
+                       ex(buf);
+                       continue;
+               }
+               write(fileno(tf), buf, i);
+               if ( buf[ i - 1 ] == '\n' )
+                   write( fileno( tf ) , "\r" , 1 );
+       }
+
+perm:
+       printf("Permission denied\n");
+       exit(1);
+}
+
+timout()
+{
+
+       printf("Timeout opening their tty\n");
+       exit(1);
+}
+
+eof()
+{
+
+       fprintf(tf, "EOF\r\n");
+       exit(0);
+}
+
+ex(bp)
+char *bp;
+{
+       register i;
+
+       sigs(SIG_IGN);
+       i = fork();
+       if(i < 0) {
+               printf("Try again\n");
+               goto out;
+       }
+       if(i == 0) {
+               sigs((int (*)())0);
+               execl(getenv("SHELL") ? getenv("SHELL") : "/bin/sh", "sh", "-c", bp+1, 0);
+               exit(0);
+       }
+       while(wait((int *)NULL) != i)
+               ;
+       printf("!\n");
+out:
+       sigs(eof);
+}
+
+sigs(sig)
+int (*sig)();
+{
+       register i;
+
+       for(i=0;signum[i];i++)
+               signal(signum[i],sig);
+}