113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
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/* ptyfs.c - communication to PTYFS */
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#include <minix/driver.h>
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#include <minix/ds.h>
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#include "ptyfs.h"
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/*
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* Perform synchronous communication with PTYFS, if PTYFS is actually running.
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* This function is expected to return only once PTYFS has acknowledged
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* processing the request, in order to avoid race conditions between PTYFS and
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* userland. The function must always fail when PTYFS is not available for any
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* reason. Return OK on success, or an IPC-level error on failure.
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*/
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static int
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ptyfs_sendrec(message * m_ptr)
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{
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endpoint_t endpt;
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/*
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* New pseudoterminals are created sufficiently rarely that we need not
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* optimize this by for example caching the PTYFS endpoint, especially
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* since caching brings along new issues, such as having to reissue the
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* request if the cached endpoint turns out to be outdated (e.g., when
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* ptyfs is unmounted and remounted for whatever reason).
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*/
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if (ds_retrieve_label_endpt("ptyfs", &endpt) != OK)
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return EDEADSRCDST; /* ptyfs is not available */
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return ipc_sendrec(endpt, m_ptr);
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}
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/*
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* Add or update a node on PTYFS, with the given node index and attributes.
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* Return OK on success, or an error code on failure. Errors may include
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* communication failures and out-of-memory conditions.
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*/
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int
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ptyfs_set(unsigned int index, mode_t mode, uid_t uid, gid_t gid, dev_t dev)
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{
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message m;
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int r;
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memset(&m, 0, sizeof(m));
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m.m_type = PTYFS_SET;
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m.m_pty_ptyfs_req.index = index;
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m.m_pty_ptyfs_req.mode = mode;
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m.m_pty_ptyfs_req.uid = uid;
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m.m_pty_ptyfs_req.gid = gid;
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m.m_pty_ptyfs_req.dev = dev;
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if ((r = ptyfs_sendrec(&m)) != OK)
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return r;
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return m.m_type;
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}
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/*
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* Remove a node from PTYFS. Return OK on success, or an error code on
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* failure. The function succeeds even if no node existed for the given index.
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*/
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int
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ptyfs_clear(unsigned int index)
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{
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message m;
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int r;
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memset(&m, 0, sizeof(m));
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m.m_type = PTYFS_CLEAR;
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m.m_pty_ptyfs_req.index = index;
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if ((r = ptyfs_sendrec(&m)) != OK)
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return r;
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return m.m_type;
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}
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/*
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* Obtain the file name for the PTYFS node with the given index, and store it
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* in the given 'name' buffer which consists of 'size' bytes. On success,
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* return OK, with the file name stored as a null-terminated string. The
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* returned name does not include the PTYFS mount path. On failure, return an
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* error code. Among other reasons, the function fails if no node is allocated
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* for the given index, and if the name does not fit in the given buffer.
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*/
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int
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ptyfs_name(unsigned int index, char * name, size_t size)
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{
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message m;
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int r;
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memset(&m, 0, sizeof(m));
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m.m_type = PTYFS_NAME;
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m.m_pty_ptyfs_req.index = index;
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if ((r = ptyfs_sendrec(&m)) != OK)
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return r;
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if (m.m_type != OK)
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return m.m_type;
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/* Ensure null termination, and make sure the string fits. */
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m.m_ptyfs_pty_name.name[sizeof(m.m_ptyfs_pty_name.name) - 1] = 0;
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if (strlen(m.m_ptyfs_pty_name.name) >= size)
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return ENAMETOOLONG;
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strlcpy(name, m.m_ptyfs_pty_name.name, size);
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return OK;
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}
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