libc-top-half/musl/src/conf/fpathconf.c

   1 #include <unistd.h>
   2 #include <limits.h>
   3 #include <errno.h>
   4
   5 long fpathconf(int fd, int name)
   6 {
   7         static const short values[] = {
   8                 [_PC_LINK_MAX] = _POSIX_LINK_MAX,
   9                 [_PC_MAX_CANON] = _POSIX_MAX_CANON,
  10                 [_PC_MAX_INPUT] = _POSIX_MAX_INPUT,
  11                 [_PC_NAME_MAX] = NAME_MAX,
  12                 [_PC_PATH_MAX] = PATH_MAX,
  13 #ifdef __wasilibc_unmodified_upstream // WASI has no pipes
  14                 [_PC_PIPE_BUF] = PIPE_BUF,
  15 #else
  16                 [_PC_PIPE_BUF] = -1,
  17 #endif
  18                 [_PC_CHOWN_RESTRICTED] = 1,
  19                 [_PC_NO_TRUNC] = 1,
  20                 [_PC_VDISABLE] = 0,
  21                 [_PC_SYNC_IO] = 1,
  22                 [_PC_ASYNC_IO] = -1,
  23                 [_PC_PRIO_IO] = -1,
  24                 [_PC_SOCK_MAXBUF] = -1,
  25                 [_PC_FILESIZEBITS] = FILESIZEBITS,
  26                 [_PC_REC_INCR_XFER_SIZE] = 4096,
  27                 [_PC_REC_MAX_XFER_SIZE] = 4096,
  28                 [_PC_REC_MIN_XFER_SIZE] = 4096,
  29                 [_PC_REC_XFER_ALIGN] = 4096,
  30                 [_PC_ALLOC_SIZE_MIN] = 4096,
  31                 [_PC_SYMLINK_MAX] = -1,
  32                 [_PC_2_SYMLINKS] = 1
  33         };
  34         if (name >= sizeof(values)/sizeof(values[0])) {
  35                 errno = EINVAL;
  36                 return -1;
  37         }
  38         return values[name];
  39 }