1explain_unsetenv_or_die(3) Library Functions Manual explain_unsetenv_or_die(3)
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NAME

6       explain_unsetenv_or_die  -  remove  an  environment variable and report
7       errors
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SYNOPSIS

10       #include <libexplain/unsetenv.h>
11       void explain_unsetenv_or_die(const char *name);
12       int explain_unsetenv_on_error(const char *name);
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DESCRIPTION

15       The explain_unsetenv_or_die function is used to  call  the  unsetenv(3)
16       system  call.  On  failure  an  explanation  will be printed to stderr,
17       obtained from the explain_unsetenv(3) function, and  then  the  process
18       terminates by calling exit(EXIT_FAILURE).
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20       The  explain_unsetenv_on_error function is used to call the unsetenv(3)
21       system call. On failure an  explanation  will  be  printed  to  stderr,
22       obtained  from  the  explain_unsetenv(3) function, but still returns to
23       the caller.
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25       name    The name, exactly as to be passed  to  the  unsetenv(3)  system
26               call.
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RETURN VALUE

29       The  explain_unsetenv_or_die  function  only  returns  on  success, see
30       unsetenv(3) for more information. On failure, prints an explanation and
31       exits, it does not return.
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33       The  explain_unsetenv_on_error function always returns the value return
34       by the wrapped unsetenv(3) system call.
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EXAMPLE

37       The explain_unsetenv_or_die function is intended to be used in a  fash‐
38       ion similar to the following example:
39              explain_unsetenv_or_die(name);
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SEE ALSO

42       unsetenv(3)
43               change or add an environment variable
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45       explain_unsetenv(3)
46               explain unsetenv(3) errors
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48       exit(2) terminate the calling process
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51       libexplain version 0.40
52       Copyright (C) 2010 Peter Miller
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56                                                    explain_unsetenv_or_die(3)
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