Mercurial > code
changeset 32:ed6ae3b865c9
Use __attribute__ ((noreturn)) on err(x) functions
| author | David Demelier <markand@malikania.fr> |
|---|---|
| date | Sun, 25 Sep 2011 19:15:55 +0200 |
| parents | e532a973f43d |
| children | 23a3ebcbf08e |
| files | err.h |
| diffstat | 1 files changed, 20 insertions(+), 4 deletions(-) [+] |
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--- a/err.h Fri Sep 23 08:58:23 2011 +0200 +++ b/err.h Sun Sep 25 19:15:55 2011 +0200 @@ -22,21 +22,37 @@ #include <stdarg.h> /* + * Attribute noreturn may helps. This may produce a warning with GCC 4.5: + * + * int a; + * + * if ((a = getstate() < 0) + * errx(1, "State failed"); + * + * Because compilator does not know that errx will call exit may produce + * a warning like `a may be used uninitialized'. + */ + +#ifdef __GNUC__ +#define _NORETURN_ __attribute__ ((noreturn)) +#endif + +/* * err() functions append the format message to the stderr FILE pointer. They * also append the system error using strerror(errno). Then the functions exit * with the error code given as first argument. */ -void err(int, const char *, ...); -void verr(int, const char *, va_list); +void err(int, const char *, ...) _NORETURN_; +void verr(int, const char *, va_list) _NORETURN_; /* * errx() functions are similar to err() except that they do not append the * system error message. */ -void errx(int, const char *, ...); -void verrx(int, const char *, va_list); +void errx(int, const char *, ...) _NORETURN_; +void verrx(int, const char *, va_list) _NORETURN_; /* * warn() functions are similar to err() but they do not call exit().