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procfs: /proc/self as a dynamic symlink

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This commit is contained in:
K. Lange 2018-10-11 19:52:11 +09:00
parent 373df32e7b
commit 68f59d27f7
1 changed files with 37 additions and 1 deletions
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38
modules/procfs.c
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@ -789,6 +789,42 @@ static struct dirent * readdir_procfs_root(fs_node_t *node, uint32_t index) {
return out;
}
static int readlink_self(fs_node_t * node, char * buf, size_t size) {
char tmp[30];
size_t req;
sprintf(tmp, "/proc/%d", current_process->id);
req = strlen(tmp) + 1;
if (size < req) {
memcpy(buf, tmp, size);
buf[size-1] = '\0';
return size-1;
}
if (size > req) size = req;
memcpy(buf, tmp, size);
return size-1;
}
static fs_node_t * procfs_create_self(void) {
fs_node_t * fnode = malloc(sizeof(fs_node_t));
memset(fnode, 0x00, sizeof(fs_node_t));
fnode->inode = 0;
strcpy(fnode->name, "self");
fnode->mask = 0777;
fnode->uid = 0;
fnode->gid = 0;
fnode->flags = FS_FILE | FS_SYMLINK;
fnode->readlink = readlink_self;
fnode->length = 1;
fnode->nlink = 1;
fnode->ctime = now();
fnode->mtime = now();
fnode->atime = now();
return fnode;
}
static fs_node_t * finddir_procfs_root(fs_node_t * node, char * name) {
if (!name) return NULL;
if (strlen(name) < 1) return NULL;
@ -805,7 +841,7 @@ static fs_node_t * finddir_procfs_root(fs_node_t * node, char * name) {
}
if (!strcmp(name,"self")) {
return procfs_procdir_create((process_t *)current_process);
return procfs_create_self();
}
for (unsigned int i = 0; i < PROCFS_STANDARD_ENTRIES; ++i) {