diff options
Diffstat (limited to 'libc/unistd')
| -rw-r--r-- | libc/unistd/pathconf.c | 216 |
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; + } + } |