diff options
Diffstat (limited to 'ports/unix/guts/mknodat.c')
-rw-r--r-- | ports/unix/guts/mknodat.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/ports/unix/guts/mknodat.c b/ports/unix/guts/mknodat.c new file mode 100644 index 0000000..22fe5ce --- /dev/null +++ b/ports/unix/guts/mknodat.c @@ -0,0 +1,66 @@ +/* + * Copyright (c) 2011 Wind River Systems; see + * guts/COPYRIGHT for information. + * + * int mknodat(int dirfd, const char *path, mode_t mode, dev_t dev) + * int rc = -1; + */ + + pseudo_msg_t *msg; + struct stat buf; + +#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS + if (dirfd != AT_FDCWD) { + errno = ENOSYS; + return -1; + } + rc = real_stat(path, &buf); +#else + rc = real___fxstatat(_STAT_VER, dirfd, path, &buf, AT_SYMLINK_NOFOLLOW); +#endif + if (rc != -1) { + /* if we can stat the file, you can't mknod it */ + errno = EEXIST; + return -1; + } +#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS + rc = real_open(path, O_CREAT | O_WRONLY | O_EXCL, PSEUDO_FS_MODE(mode)); +#else + rc = real_openat(dirfd, path, O_CREAT | O_WRONLY | O_EXCL, + PSEUDO_FS_MODE(mode)); +#endif + if (rc == -1) { + return -1; + } + real_fstat(rc, &buf); + /* mknod does not really open the file. We don't have + * to use wrap_close because we've never exposed this file + * descriptor to the client code. + */ + real_close(rc); + + /* mask in the mode type bits again */ + buf.st_mode = (PSEUDO_DB_MODE(buf.st_mode, mode) & 07777) | + (mode & ~07777); + buf.st_rdev = dev; + msg = pseudo_client_op_plain(OP_MKNOD, 0, -1, dirfd, path, &buf); + if (msg && msg->result != RESULT_SUCCEED) { + errno = EPERM; + rc = -1; + } else { + /* just pretend we worked */ + rc = 0; + } + if (rc == -1) { + int save_errno = errno; +#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS + real_unlink(path); +#else + real_unlinkat(dirfd, path, AT_SYMLINK_NOFOLLOW); +#endif + errno = save_errno; + } + +/* return rc; + * } + */ |