1 /* POSIX fpathconf (Sec. 5.7.1) Author: Andy Tanenbaum */ 2 3 #include <sys/cdefs.h> 4 #include "namespace.h" 5 #include <lib.h> 6 7 #include <sys/stat.h> 8 #include <errno.h> 9 #include <limits.h> 10 #include <unistd.h> 11 #include <termios.h> 12 13 long fpathconf(fd, name) 14 int fd; /* file descriptor being interrogated */ 15 int name; /* property being inspected */ 16 { 17 /* POSIX allows some of the values in <limits.h> to be increased at 18 * run time. The pathconf and fpathconf functions allow these values 19 * to be checked at run time. MINIX does not use this facility. 20 * The run-time limits are those given in <limits.h>. 21 */ 22 23 struct stat stbuf; 24 25 switch(name) { 26 case _PC_LINK_MAX: 27 /* Fstat the file. If that fails, return -1. */ 28 if (fstat(fd, &stbuf) != 0) return(-1); 29 if (S_ISDIR(stbuf.st_mode)) 30 return(1L); /* no links to directories */ 31 else 32 return( (long) LINK_MAX); 33 34 case _PC_MAX_CANON: 35 return( (long) MAX_CANON); 36 37 case _PC_MAX_INPUT: 38 return( (long) MAX_INPUT); 39 40 case _PC_NAME_MAX: 41 return( (long) NAME_MAX); 42 43 case _PC_PATH_MAX: 44 return( (long) PATH_MAX); 45 46 case _PC_PIPE_BUF: 47 return( (long) PIPE_BUF); 48 49 case _PC_CHOWN_RESTRICTED: 50 return( (long) _POSIX_CHOWN_RESTRICTED); 51 52 case _PC_NO_TRUNC: 53 return( (long) _POSIX_NO_TRUNC); 54 55 case _PC_VDISABLE: 56 return( (long) _POSIX_VDISABLE); 57 58 default: 59 errno = EINVAL; 60 return(-1); 61 } 62 } 63