mirror of
https://git.proxmox.com/git/wasi-libc
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446cb3f1aa
* Make __wasi_linkcount_t a uint64_t (#134) Refs: https://github.com/WebAssembly/WASI/pull/127 * Generate the WASI interface from witx. This replaces the hand-maintained <wasi/core.h> header with a <wasi/api.h> generated from witx. Most of the churn here is caused by upstream WASI renamings; hopefully in the future ABI updates will be less noisy.
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
#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-internal.h>
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__wasi_errno_t __wasilibc_populate_environ(void) __attribute__((weak));
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extern void __wasm_call_ctors(void);
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extern int __original_main(void);
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extern void __prepare_for_exit(void);
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void _Exit(int) __attribute__((noreturn));
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__wasi_errno_t __wasilibc_populate_libpreopen(void) __attribute__((weak));
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void _start(void) {
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// Record the preopened resources, if needed.
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if (&__wasilibc_populate_libpreopen != NULL &&
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__wasilibc_populate_libpreopen() != __WASI_ERRNO_SUCCESS)
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{
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_Exit(EX_OSERR);
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}
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// Fill in the environment from WASI syscalls, if needed.
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if (&__wasilibc_populate_environ != NULL &&
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__wasilibc_populate_environ() != __WASI_ERRNO_SUCCESS)
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{
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_Exit(EX_OSERR);
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}
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// The linker synthesizes this to call constructors.
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__wasm_call_ctors();
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// Call `__original_main` which will either be the application's
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// zero-argument `main` function (renamed by the compiler) or a libc
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// routine which populates `argv` and `argc` and calls the application's
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// two-argument `main`.
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int r = __original_main();
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// Call atexit functions, destructors, stdio cleanup, etc.
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__prepare_for_exit();
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// If main exited successfully, just return, otherwise call _Exit.
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if (r != 0) {
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_Exit(r);
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}
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}
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