getenv

 

C

Lingua

Tipo di supporto

Gestione della memoria dinamica

La gestione degli errori

Programma di utilità

Data e ora utilità

Stringhe libreria

Algoritmi

Numeri

Ingresso / uscita supporto

Localizzazione supporto

Thread di supporto(C11)

Operazioni atomiche(C11)

 

Programma di supporto utilità

Programma di terminazione Original: Program termination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
abort exit quick_exit (C++11) _Exit (C++11)	atexit at_quick_exit (C++11) EXIT_SUCCESS EXIT_FAILURE
Comunicante con l'ambiente Original: Communicating with the environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
system	getenv
Segnali Original: Signals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
signal raise sig_atomic_t	SIG_DFL SIG_IGN SIG_ERR
Tipi di segnale Original: Signal types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
SIGABRT SIGFPE SIGILL SIGINT SIGSEGV SIGTERM
Non locali salti Original: Non-local jumps The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setjmp
longjmp
Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
jmp_buf

 

Elemento definito nell'header <stdlib.h>
constchar*getenv(constchar*env_var );

Cerca un variabile ambientale con env_var nome nella lista di host specificato ambiente e restituisce le informazioni ad esso associati. L'insieme di variabili ambientali e metodi di alterarla sono definiti dall'implementazione.

Original:

Searches for an environmental variable with name env_var in the host-specified environment list and returns information associated with it. The set of environmental variables and methods of altering it are implementation-defined.

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Parametri

env_var

-

terminazione null stringa di caratteri che identifica il nome della variabile d'ambiente per cercare Original: null-terminated character string identifying the name of the environmental variable to look for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

stringa di caratteri che identifica il valore della variabile ambientale o NULL se tale variabile non viene trovato.

Original:

character string identifying the value of the environmental variable or NULL if such variable is not found.

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Vedi anche

C++ documentation for getenv