41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/* VTreeFS - link.c - by Alen Stojanov and David van Moolenbroek */
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#include "inc.h"
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/*===========================================================================*
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* fs_rdlink *
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*===========================================================================*/
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int fs_rdlink(void)
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{
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/* Retrieve symbolic link target.
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*/
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char path[PATH_MAX];
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struct inode *node;
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size_t len;
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int r;
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if ((node = find_inode(fs_m_in.m_vfs_fs_rdlink.inode)) == NULL)
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return EINVAL;
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/* Call the rdlink hook. */
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assert(vtreefs_hooks->rdlink_hook != NULL);
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assert(!is_inode_deleted(node)); /* symlinks cannot be opened */
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r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
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get_inode_cbdata(node));
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if (r != OK) return r;
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len = strlen(path);
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assert(len > 0 && len < sizeof(path));
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if (len > fs_m_in.m_vfs_fs_rdlink.mem_size)
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len = fs_m_in.m_vfs_fs_rdlink.mem_size;
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/* Copy out the result. */
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r = sys_safecopyto(fs_m_in.m_source, fs_m_in.m_vfs_fs_rdlink.grant, 0,
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(vir_bytes) path, len);
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if (r != OK) return r;
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fs_m_out.m_fs_vfs_rdlink.nbytes = len;
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return OK;
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}
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