mirror of
https://github.com/Mathewnd/Astral.git
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Matheus
96 lines
1.6 KiB
C
96 lines
1.6 KiB
C
#include <kernel/syscalls.h>
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#include <kernel/vfs.h>
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#include <sys/types.h>
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#include <arch/cls.h>
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#include <kernel/fd.h>
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#include <kernel/sched.h>
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#include <string.h>
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static int gettarget(fd_t** targ, dirnode_t** targnode, int ifd, proc_t* proc){
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if(ifd != AT_FDCWD){
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int err = fd_access(&proc->fdtable, targ, ifd);
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if(err)
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return err;
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if(GETTYPE((*targ)->mode) != TYPE_DIR)
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return ENOTDIR;
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*targnode = (*targ)->node;
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}
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else
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*targnode = proc->cwd;
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}
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// flags is ignored for now
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syscallret syscall_linkat(int srcdirfd, const char* srcpath, int tgtdirfd, const char* tgtpath, int flags){
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syscallret retv;
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retv.ret = -1;
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if(srcpath > USER_SPACE_END || tgtpath > USER_SPACE_END){
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retv.errno = EFAULT;
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return retv;
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}
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size_t srclen = strlen(srcpath);
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size_t tgtlen = strlen(tgtpath);
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char srcbuff[srclen+1];
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char tgtbuff[tgtlen+1];
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strcpy(srcbuff, srcpath);
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strcpy(tgtbuff, tgtpath);
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proc_t* proc = arch_getcls()->thread->proc;
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dirnode_t* source;
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fd_t* srcfd = NULL;
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dirnode_t* target;
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fd_t* tgtfd = NULL;
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retv.errno = gettarget(&srcfd, &source, srcdirfd, proc);
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if(retv.errno)
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goto _fail;
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retv.errno = gettarget(&tgtfd, &target, tgtdirfd, proc);
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if(retv.errno)
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goto _fail;
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vnode_t* node;
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retv.errno = vfs_open(&node, srcbuff[0] == '/' ? proc->root : source, srcbuff);
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if(retv.errno)
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goto _fail;
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retv.errno = vfs_link(tgtbuff[0] == '/' ? proc->root : target, node, tgtbuff);
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vfs_close(node);
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_fail:
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if(srcdirfd != AT_FDCWD && srcfd)
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fd_release(srcfd);
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if(tgtdirfd != AT_FDCWD && tgtfd)
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fd_release(tgtfd);
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retv.ret = retv.errno ? -1 : 0;
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return retv;
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}
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