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https://git.proxmox.com/git/wasi-libc
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82fc2c4f44
Add a `__wasilibc_deinit_environ` function which clears the current environment variable state to the state where next time the environment variable functions are called, they'll reinitialize the environment. And add a `__wasilibc_maybe_reinitialize_environ_eagerly` function to reinitialize the environment variable state if `environ` or `_environ` are needed. These functions are needed by wizer to be able to suspend and resume a program and have it read new environment variables from the host environment; see bytecodealliance/wizer#8 for background.
34 lines
1.3 KiB
C
34 lines
1.3 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <sysexits.h>
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#include <wasi/api.h>
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#include <wasi/libc.h>
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#include <wasi/libc-environ.h>
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// If the program does use `environ`, it'll get this version of
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// `__wasilibc_environ`, which is initialized with a constructor function, so
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// that it's initialized whenever user code might want to access it.
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char **__wasilibc_environ;
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extern __typeof(__wasilibc_environ) _environ
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__attribute__((weak, alias("__wasilibc_environ")));
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extern __typeof(__wasilibc_environ) environ
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__attribute__((weak, alias("__wasilibc_environ")));
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// We define this function here in the same source file as
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// `__wasilibc_environ`, so that this function is called in iff environment
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// variable support is used.
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// Concerning the 50 -- levels up to 100 are reserved for the implementation,
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// so we an arbitrary number in the middle of the range to allow other
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// reserved things to go before or after.
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__attribute__((constructor(50)))
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static void __wasilibc_initialize_environ_eagerly(void) {
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__wasilibc_initialize_environ();
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}
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// See the comments in libc-environ.h.
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void __wasilibc_maybe_reinitialize_environ_eagerly(void) {
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// This translation unit is linked in if `environ` is used, meaning we need
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// to eagerly reinitialize the environment variables.
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__wasilibc_initialize_environ();
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}
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