mirror of
https://github.com/jart/cosmopolitan.git
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81 lines
3.9 KiB
C
81 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/stat.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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// clang-format off
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static void __procfdname(char *buf, unsigned fd) {
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unsigned i, j;
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for (i = 0; (buf[i] = "/proc/self/fd/"[i]); i++);
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if (!fd) {
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buf[i] = '0';
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buf[i + 1] = 0;
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return;
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}
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for (j = fd; j; j /= 10, i++);
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buf[i] = 0;
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for (; fd; fd /= 10) buf[--i] = '0' + fd % 10;
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}
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int sys_fchmodat_linux(int fd, const char *path, unsigned mode, int flag) {
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struct stat st;
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int ret, fd2;
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char proc[15 + 3 * sizeof(int)];
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if (flag != AT_SYMLINK_NOFOLLOW)
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return einval();
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if (sys_fstatat(fd, path, &st, flag))
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return -1;
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if (S_ISLNK(st.st_mode))
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return eopnotsupp();
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if ((fd2 = sys_openat(fd, path, (O_RDONLY | O_PATH | O_NOFOLLOW |
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O_NOCTTY | O_CLOEXEC), 0)) < 0) {
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if (fd2 == -ELOOP)
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return eopnotsupp();
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return fd2;
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}
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__procfdname(proc, fd2);
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ret = sys_fstatat(AT_FDCWD, proc, &st, 0);
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if (!ret) {
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if (S_ISLNK(st.st_mode))
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ret = eopnotsupp();
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else
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ret = sys_fchmodat(AT_FDCWD, proc, mode, 0);
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}
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sys_close(fd2);
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return ret;
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}
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