sys_readlink [fs/stat.c]
Reads value of a symbolic link relative to a directory file descriptor. This system call operates in exactly the same way as sys_readlink, except for the differences described below. Arguments
eax | 305
ebx | Directory file descriptor.
ecx | Pointer to a null-terminated string specifying the symbolic link pathname. If the pathname is relative, then it is interpreted relative to the directory referred to by the file descriptor ebx (rather than relative to the current working directory of the calling process, as is done by sys_readlink for a relative pathname). If the pathname is relative and ebx is the special value AT_FDCWD, then path is interpreted relative to the current working directory of the calling process. If the pathname is absolute, then ebx is ignored.
edx | Pointer to a buffer which will receive the value. null byte is not appended by sys_readlink.
esi | Size of the buffer pointed by edx. In case the buffer is too small the value sys_readlink will truncate its contents.
Return values If the system call succeeds the return value is the count of characters placed in the buffer. If the system call fails the return value is one of the following errno values:
`-EACCES` | `Search permission is denied for a component of the path prefix.`
`-EFAULT` | `Buffer pointed by edx extends outside the process's allocated address space.`
`-EINVAL` | `The named file is not a symbolic link. -or- esi is not positive.`
`-EIO` | `An I/O error occurred while reading from the file system.`
`-ELOOP` | `Too many symbolic links were encountered in translating the pathname.`
`-ENAMETOOLONG` | `A pathname, or a component of a pathname, was too long.`
`-ENOENT` | `The named file does not exist.`
`-ENOMEM` | `Insufficient kernel memory was available.`
`-ENOTDIR` | `A component of the path prefix is not a directory. -or- Path is a relative path and ebx is a file descriptor referring to a file other than a directory.`
`-EBADF` | `ebx is not a valid file descriptor.`
Remarks n/a Compatibility Available since 2.6.16.