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| explain_unsetenv_or_die(3) | FreeBSD Library Functions Manual | explain_unsetenv_or_die(3) |
NAME
explain_unsetenv_or_die - remove an environment variable and report errorsSYNOPSIS
#include <libexplain/unsetenv.h>void explain_unsetenv_or_die(const char *name);
int explain_unsetenv_on_error(const char *name);
DESCRIPTION
The explain_unsetenv_or_die function is used to call the unsetenv(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_unsetenv(3) function, and then the process terminates by calling exit(EXIT_FAILURE).The explain_unsetenv_on_error function is used to call the unsetenv(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_unsetenv(3) function, but still returns to the caller.
- name
- The name, exactly as to be passed to the unsetenv(3) system call.
RETURN VALUE
The explain_unsetenv_or_die function only returns on success, see unsetenv(3) for more information. On failure, prints an explanation and exits, it does not return.The explain_unsetenv_on_error function always returns the value return by the wrapped unsetenv(3) system call.
EXAMPLE
The explain_unsetenv_or_die function is intended to be used in a fashion similar to the following example:explain_unsetenv_or_die(name);
SEE ALSO
- unsetenv(3)
- change or add an environment variable
- explain_unsetenv(3)
- explain unsetenv(3) errors
- exit(2)
- terminate the calling process
COPYRIGHT
libexplain version 1.3Copyright (C) 2010 Peter Miller
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