60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
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/* POSIX fpathconf (Sec. 5.7.1) Author: Andy Tanenbaum */
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#include <lib.h>
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#include <sys/types.h>
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#define fstat _fstat
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#include <sys/stat.h>
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#include <errno.h>
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#include <limits.h>
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PUBLIC long fpathconf(fd, name)
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int fd; /* file descriptor being interrogated */
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int name; /* property being inspected */
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{
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/* POSIX allows some of the values in <limits.h> to be increased at
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* run time. The pathconf and fpathconf functions allow these values
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* to be checked at run time. MINIX does not use this facility.
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* The run-time limits are those given in <limits.h>.
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*/
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struct stat stbuf;
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switch(name) {
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case _PC_LINK_MAX:
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/* Fstat the file. If that fails, return -1. */
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if (fstat(fd, &stbuf) != 0) return(-1L);
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if (S_ISDIR(stbuf.st_mode))
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return(1L); /* no links to directories */
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else
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return( (long) LINK_MAX);
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case _PC_MAX_CANON:
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return( (long) MAX_CANON);
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case _PC_MAX_INPUT:
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return( (long) MAX_INPUT);
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case _PC_NAME_MAX:
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return( (long) NAME_MAX);
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case _PC_PATH_MAX:
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return( (long) PATH_MAX);
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case _PC_PIPE_BUF:
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return( (long) PIPE_BUF);
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case _PC_CHOWN_RESTRICTED:
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return( (long) 1); /* MINIX defines CHOWN_RESTRICTED */
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case _PC_NO_TRUNC: /* MINIX does not define NO_TRUNC */
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return( (long) 0);
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case _PC_VDISABLE: /* MINIX defines VDISABLE */
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return( (long) _POSIX_VDISABLE);
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default:
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errno = EINVAL;
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return(-1L);
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}
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}
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