41 строка
1 КиБ
Go
41 строка
1 КиБ
Go
// +build linux
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package runtime
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// Update the C environment if cgo is loaded.
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// Called from syscall.Setenv.
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//go:linkname syscall_setenv_c syscall.setenv_c
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func syscall_setenv_c(key string, val string) {
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keydata := cstring(key)
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valdata := cstring(val)
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// ignore any errors
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libc_setenv(&keydata[0], &valdata[0], 1)
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return
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}
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// Update the C environment if cgo is loaded.
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// Called from syscall.Unsetenv.
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//go:linkname syscall_unsetenv_c syscall.unsetenv_c
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func syscall_unsetenv_c(key string) {
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keydata := cstring(key)
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// ignore any errors
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libc_unsetenv(&keydata[0])
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return
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}
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// cstring converts a Go string to a C string.
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// borrowed from syscall
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func cstring(s string) []byte {
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data := make([]byte, len(s)+1)
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copy(data, s)
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// final byte should be zero from the initial allocation
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return data
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}
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// int setenv(const char *name, const char *val, int replace);
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//export setenv
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func libc_setenv(name *byte, val *byte, replace int32) int32
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// int unsetenv(const char *name);
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//export unsetenv
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func libc_unsetenv(name *byte) int32
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