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author | Russ Cox <rsc@golang.org> | 2014-10-03 12:22:19 -0400 |
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committer | Russ Cox <rsc@golang.org> | 2014-10-03 12:22:19 -0400 |
commit | c5aca6fedbdd83d9153f6a00dc656aaabb0774c5 (patch) | |
tree | 26952b971b307783cde4b126c0a133f62ac3c893 /src/syscall/env_plan9.go | |
parent | 4eb6792aa572c7e6d3448d4cf22223b61b65724f (diff) | |
parent | 338c7ea5df93e25ac4dc143970603a1e88b26124 (diff) | |
download | go-c5aca6fedbdd83d9153f6a00dc656aaabb0774c5.tar.gz |
[dev.garbage] merge default into dev.garbage
Diffstat (limited to 'src/syscall/env_plan9.go')
-rw-r--r-- | src/syscall/env_plan9.go | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/src/syscall/env_plan9.go b/src/syscall/env_plan9.go index 9587ab5af..934507905 100644 --- a/src/syscall/env_plan9.go +++ b/src/syscall/env_plan9.go @@ -12,16 +12,22 @@ import ( ) var ( - // envOnce guards copyenv, which populates env. + // envOnce guards copyenv, which populates env, envi and envs. envOnce sync.Once - // envLock guards env and envs. + // envLock guards env, envi and envs. envLock sync.RWMutex // env maps from an environment variable to its value. + // TODO: remove this? golang.org/issue/8849 env = make(map[string]string) + // envi maps from an environment variable to its index in envs. + // TODO: remove this? golang.org/issue/8849 + envi = make(map[string]int) + // envs contains elements of env in the form "key=value". + // empty strings mean deleted. envs []string errZeroLengthKey = errors.New("zero length key") @@ -83,6 +89,7 @@ func copyenv() { } env[key] = v envs[i] = key + "=" + v + envi[key] = i i++ } } @@ -121,6 +128,7 @@ func Setenv(key, value string) error { } env[key] = value envs = append(envs, key+"="+value) + envi[key] = len(envs) - 1 return nil } @@ -129,14 +137,39 @@ func Clearenv() { defer envLock.Unlock() env = make(map[string]string) + envi = make(map[string]int) envs = []string{} RawSyscall(SYS_RFORK, RFCENVG, 0, 0) } +func Unsetenv(key string) error { + if len(key) == 0 { + return errZeroLengthKey + } + + envLock.Lock() + defer envLock.Unlock() + + Remove("/env/" + key) + + if i, ok := envi[key]; ok { + delete(env, key) + delete(envi, key) + envs[i] = "" + } + return nil +} + func Environ() []string { envLock.RLock() defer envLock.RUnlock() envOnce.Do(copyenv) - return append([]string(nil), envs...) + ret := make([]string, 0, len(envs)) + for _, pair := range envs { + if pair != "" { + ret = append(ret, pair) + } + } + return ret } |