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authorEric Andersen <andersen@codepoet.org>2001-11-21 14:41:38 +0000
committerEric Andersen <andersen@codepoet.org>2001-11-21 14:41:38 +0000
commit404978ea7c6f08fa302ea6318a1ea5db7705293d (patch)
tree5db86a33e8f02281e83d9db7b110b52e83372904 /libc/unistd/pathconf.c
parent1b2ddaae027925843a393837f56f6d9e76d6b968 (diff)
pathconf can't use fpathconf or it will block opening FIFOs
Diffstat (limited to 'libc/unistd/pathconf.c')
-rw-r--r--libc/unistd/pathconf.c216
1 files changed, 209 insertions, 7 deletions
diff --git a/libc/unistd/pathconf.c b/libc/unistd/pathconf.c
index 64ed79531..d7fa99f50 100644
--- a/libc/unistd/pathconf.c
+++ b/libc/unistd/pathconf.c
@@ -17,32 +17,234 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+
+/* It would be great it this could be implemented using fpathconf,
+ * but that doesn't work out very well (think FIFOs and sockets) */
+
#include <errno.h>
#include <unistd.h>
#include <limits.h>
+#include <sys/statfs.h>
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+//#include <sys/statvfs.h>
+
+//#include "linux_fsinfo.h"
+
+
+/* The Linux kernel headers mention this as a kind of generic value. */
+#define LINUX_LINK_MAX 127
/* Get file-specific information about descriptor FD. */
long int pathconf(const char *path, int name)
{
- int fd;
-
if (path[0] == '\0')
{
__set_errno (ENOENT);
return -1;
}
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- __set_errno (ENOENT);
- return -1;
+ if (name == _PC_LINK_MAX)
+ {
+ /* Cut some corners */
+#if 0
+ struct statfs fsbuf;
+
+ /* Determine the filesystem type. */
+ if (statfs (path, &fsbuf) < 0)
+ {
+ if (errno == ENOSYS)
+ /* not possible, return the default value. */
+ return LINUX_LINK_MAX;
+
+ /* Some error occured. */
+ return -1;
+ }
+
+ switch (fsbuf.f_type)
+ {
+ case EXT2_SUPER_MAGIC:
+ return EXT2_LINK_MAX;
+
+ case MINIX_SUPER_MAGIC:
+ case MINIX_SUPER_MAGIC2:
+ return MINIX_LINK_MAX;
+
+ case MINIX2_SUPER_MAGIC:
+ case MINIX2_SUPER_MAGIC2:
+ return MINIX2_LINK_MAX;
+
+ case XENIX_SUPER_MAGIC:
+ return XENIX_LINK_MAX;
+
+ case SYSV4_SUPER_MAGIC:
+ case SYSV2_SUPER_MAGIC:
+ return SYSV_LINK_MAX;
+
+ case COH_SUPER_MAGIC:
+ return COH_LINK_MAX;
+
+ case UFS_MAGIC:
+ case UFS_CIGAM:
+ return UFS_LINK_MAX;
+
+ case REISERFS_SUPER_MAGIC:
+ return REISERFS_LINK_MAX;
+
+ default:
+ return LINUX_LINK_MAX;
+ }
+#else
+ return LINUX_LINK_MAX;
+#endif
}
- return (fpathconf(fd, name));
+
+ switch (name)
+ {
+ default:
+ __set_errno (EINVAL);
+ return -1;
+
+ case _PC_MAX_CANON:
+#ifdef MAX_CANON
+ return MAX_CANON;
+#else
+ return -1;
+#endif
+
+ case _PC_MAX_INPUT:
+#ifdef MAX_INPUT
+ return MAX_INPUT;
+#else
+ return -1;
+#endif
+
+ case _PC_NAME_MAX:
+#ifdef NAME_MAX
+ {
+ struct statfs buf;
+ int save_errno = errno;
+
+ if (statfs (path, &buf) < 0)
+ {
+ if (errno == ENOSYS)
+ {
+ errno = save_errno;
+ return NAME_MAX;
+ }
+ return -1;
+ }
+ else
+ {
+#ifdef _STATFS_F_NAMELEN
+ return buf.f_namelen;
+#else
+# ifdef _STATFS_F_NAME_MAX
+ return buf.f_name_max;
+# else
+ return NAME_MAX;
+# endif
+#endif
+ }
+ }
+#else
+ return -1;
+#endif
+
+ case _PC_PATH_MAX:
+#ifdef PATH_MAX
+ return PATH_MAX;
+#else
+ return -1;
+#endif
+
+ case _PC_PIPE_BUF:
+#ifdef PIPE_BUF
+ return PIPE_BUF;
+#else
+ return -1;
+#endif
+
+ case _PC_CHOWN_RESTRICTED:
+#ifdef _POSIX_CHOWN_RESTRICTED
+ return _POSIX_CHOWN_RESTRICTED;
+#else
+ return -1;
+#endif
+
+ case _PC_NO_TRUNC:
+#ifdef _POSIX_NO_TRUNC
+ return _POSIX_NO_TRUNC;
+#else
+ return -1;
+#endif
+
+ case _PC_VDISABLE:
+#ifdef _POSIX_VDISABLE
+ return _POSIX_VDISABLE;
+#else
+ return -1;
+#endif
+
+ case _PC_SYNC_IO:
+#ifdef _POSIX_SYNC_IO
+ return _POSIX_SYNC_IO;
+#else
+ return -1;
+#endif
+
+ case _PC_ASYNC_IO:
+#if defined _POSIX_ASYNC_IO && defined __UCLIBC_HAVE_LFS__
+ {
+ /* AIO is only allowed on regular files and block devices. */
+ struct stat st;
+
+ if (stat (path, &st) < 0 || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode)))
+ return -1;
+ else
+ return 1;
+ }
+#else
+ return -1;
+#endif
+
+ case _PC_PRIO_IO:
+#ifdef _POSIX_PRIO_IO
+ return _POSIX_PRIO_IO;
+#else
+ return -1;
+#endif
+
+ case _PC_SOCK_MAXBUF:
+#ifdef SOCK_MAXBUF
+ return SOCK_MAXBUF;
+#else
+ return -1;
+#endif
+
+ case _PC_FILESIZEBITS:
+#ifdef FILESIZEBITS
+ return FILESIZEBITS;
+#else
+ /* We let platforms with larger file sizes overwrite this value. */
+ return 32;
+#endif
+
+ /* Be lazy -- skip these */
+ case _PC_REC_INCR_XFER_SIZE:
+ case _PC_REC_MAX_XFER_SIZE:
+ case _PC_REC_MIN_XFER_SIZE:
+ case _PC_REC_XFER_ALIGN:
+ case _PC_ALLOC_SIZE_MIN:
+ case _PC_SYMLINK_MAX:
+ return -1;
+ }
+
}