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Kernel+LibC: Implement the openat() syscall
POSIX's openat() is very similar to open(), except you also provide a file descriptor referring to a directory from which relative paths should be resolved. Passing it the magical fd number AT_FDCWD means "resolve from current directory" (which is indeed also what open() normally does.) This fixes libarchive's bsdtar, since it was trying to do something extremely wrong in the absence of openat() support. The issue has recently been fixed upstream in libarchive: https://github.com/libarchive/libarchive/issues/1239 However, we should have openat() support anyway, so I went ahead and implemented it. :^) Fixes #748.
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6 changed files with 80 additions and 7 deletions
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@ -134,7 +134,8 @@ struct timespec;
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__ENUMERATE_SYSCALL(fchdir) \
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__ENUMERATE_SYSCALL(getrandom) \
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__ENUMERATE_SYSCALL(clock_gettime) \
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__ENUMERATE_SYSCALL(clock_nanosleep)
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__ENUMERATE_SYSCALL(clock_nanosleep) \
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__ENUMERATE_SYSCALL(openat)
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namespace Syscall {
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@ -179,6 +180,14 @@ struct SC_open_params {
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u16 mode;
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};
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struct SC_openat_params {
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int dirfd;
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const char* path;
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int path_length;
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int options;
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u16 mode;
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};
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struct SC_select_params {
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int nfds;
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fd_set* readfds;
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