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Length: 729 (0x2d9)
Types: TextFile
Notes: UNIX file
Names: »ttyname.c«
└─⟦f27320a65⟧ Bits:30001972 Commodore 900 hard disk image with partial source code
└─⟦f4b8d8c84⟧ UNIX V7 Filesystem
└─ ⟦this⟧ »libc/gen/ttyname.c«
/*
* Coherent I/O Library
* Return the name of the terminal device
* associated with the given file descriptor.
*/
#include <stdio.h>
#include <stat.h>
#include <dir.h>
#include <canon.h>
static char tname[6+DIRSIZ] = "/dev/console";
#define tstart (tname+5) /* Where to put terminal name */
char *
ttyname(fd)
int fd;
{
struct stat sb;
struct direct db;
register devfd;
if (fstat(fd, &sb)<0 || (sb.st_mode&S_IFMT)!=S_IFCHR)
return (NULL);
if ((devfd = open("/dev", 0)) < 0)
return (NULL);
while (read(devfd, &db, sizeof(db)) == sizeof(db)) {
canino(db.d_ino);
if (db.d_ino == sb.st_ino) {
strncpy(tstart, db.d_name, DIRSIZ);
close(devfd);
return (tname);
}
}
close(devfd);
return (NULL);
}