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https://git.kernel.org/pub/scm/libs/libcap/libcap.git
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90192cd364
I've decided to put the decision to call syscall.AllThreadsSyscall*() into "psx" instead of the "cap" package. This should make client use of "psx" more straightforward and the code will 'just compile' if the user builds with CGO_ENABLED=1 or CGO_ENABLED=0. It also makes the "psx" package useful for other applications besides the "cap" package. Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
// +build cgo
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package psx
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import (
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"runtime"
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"syscall"
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"testing"
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)
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// The man page for errno indicates that it is never set to zero, so
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// validate that it retains its value over a successful Syscall[36]()
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// and is overwritten on a failing syscall.
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func TestErrno(t *testing.T) {
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// This testing is much easier if we don't have to guess which
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// thread is running this Go code.
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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// Start from a known bad state and clean up afterwards.
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setErrno(int(syscall.EPERM))
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defer setErrno(0)
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v3, _, errno := Syscall3(syscall.SYS_GETUID, 0, 0, 0)
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if errno != 0 {
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t.Fatalf("psx getuid failed: %v", errno)
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}
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v6, _, errno := Syscall6(syscall.SYS_GETUID, 0, 0, 0, 0, 0, 0)
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if errno != 0 {
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t.Fatalf("psx getuid failed: %v", errno)
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}
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if v3 != v6 {
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t.Errorf("psx getuid failed to match v3=%d, v6=%d", v3, v6)
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}
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if v := setErrno(-1); v != int(syscall.EPERM) {
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t.Errorf("psx changes prevailing errno got=%v(%d) want=%v", syscall.Errno(v), v, syscall.EPERM)
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}
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}
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