52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of M2-Planet.
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*
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* M2-Planet is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* M2-Planet is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with M2-Planet. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* chmod() changes the mode of the file specified whose pathname is given in
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* pathname, which is dereferenced if it is a symbolic link.
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* fchmod() changes the mode of the file referred to by the open file
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* descriptor fd.
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* The new file mode is specified in mode, which is a bit mask created by
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* ORing together zero or more of the following:
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* S_ISUID (04000) set-user-ID (set process effective user ID on execve(2))
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* S_ISGID (02000) set-group-ID (set process effective group ID on execve(2)
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* mandatory locking, as described in fcntl(2); take a new file's group from
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* parent directory, as described in chown(2) and mkdir(2))
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* S_ISVTX (01000) sticky bit (restricted deletion flag, as described in
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* unlink(2))
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* S_IRUSR (00400) read by owner
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* S_IWUSR (00200) write by owner
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* S_IXUSR (00100) execute/search by owner ("search" applies for directories
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* , and means that entries within the directory can be accessed)
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* S_IRGRP (00040) read by group
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* S_IWGRP (00020) write by group
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* S_IXGRP (00010) execute/search by group
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* S_IROTH (00004) read by others
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* S_IWOTH (00002) write by others
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* S_IXOTH (00001) execute/search by others
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*/
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int chmod(char *pathname, int mode)
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{
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asm("LOAD_EFFECTIVE_ADDRESS_ebx %8"
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"LOAD_INTEGER_ebx"
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"LOAD_EFFECTIVE_ADDRESS_ecx %4"
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"LOAD_INTEGER_ecx"
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"LOAD_IMMEDIATE_eax %15"
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"INT_80");
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}
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