* Is there a way to get "EINVAL" style string @ 2012-04-22 11:14 Jon Grant [not found] ` <4F93E7FC.1020904-hus3n9K41k0@public.gmane.org> 0 siblings, 1 reply; 4+ messages in thread From: Jon Grant @ 2012-04-22 11:14 UTC (permalink / raw) To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA Hello I was looking at the man pages looking for a way to get a string of the errno value meaning. This is kind of a user question. This API returns "returns a pointer to a string that describes the error code": http://man7.org/linux/man-pages/man3/strerror.3.html However, this is a description, e.g. "Invalid argument". Is there a function that would return "EINVAL" or "ENOENT" as the string? Could I suggest that the text on the man page be updated to clarify what would be returned: "returns a pointer to a string that describes the error code. e.g. "Invalid argument" if EINVAL was the errnum." Best regards, Jon -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 4+ messages in thread
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* Re: Is there a way to get "EINVAL" style string [not found] ` <4F93E7FC.1020904-hus3n9K41k0@public.gmane.org> @ 2012-04-22 21:25 ` Michael Kerrisk (man-pages) [not found] ` <CAKgNAkjP-SZXceGDaBeuNE9onk_w9-8rX1uk-XE2dRu5x8uz_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 0 siblings, 1 reply; 4+ messages in thread From: Michael Kerrisk (man-pages) @ 2012-04-22 21:25 UTC (permalink / raw) To: Jon Grant; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA Hi Jon, On Sun, Apr 22, 2012 at 11:14 PM, Jon Grant <jg-hus3n9K41k0@public.gmane.org> wrote: > Hello > > I was looking at the man pages looking for a way to get a string of the > errno value meaning. This is kind of a user question. > > This API returns "returns a pointer to a string that describes the error > code": > > http://man7.org/linux/man-pages/man3/strerror.3.html > > However, this is a description, e.g. "Invalid argument". Is there a > function that would return "EINVAL" or "ENOENT" as the string? None that I know of. (In passing, I dealt with exactly this problem for my book with a script that generated the string names; see http://man7.org/tlpi/code/online/dist/lib/ename.c.inc.html and http://man7.org/tlpi/code/online/dist/lib/error_functions.c.html) > Could I suggest that the text on the man page be updated to clarify what > would be returned: > > "returns a pointer to a string that describes the error code. e.g. "Invalid > argument" if EINVAL was the errnum." Done for 3.40. Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <CAKgNAkjP-SZXceGDaBeuNE9onk_w9-8rX1uk-XE2dRu5x8uz_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>]
* Re: Is there a way to get "EINVAL" style string [not found] ` <CAKgNAkjP-SZXceGDaBeuNE9onk_w9-8rX1uk-XE2dRu5x8uz_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> @ 2012-05-08 21:33 ` Jon Grant [not found] ` <4FA99139.90102-hus3n9K41k0@public.gmane.org> 0 siblings, 1 reply; 4+ messages in thread From: Jon Grant @ 2012-05-08 21:33 UTC (permalink / raw) To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA Hi Michael On 22/04/12 22:25, Michael Kerrisk (man-pages) wrote: > Hi Jon, > > On Sun, Apr 22, 2012 at 11:14 PM, Jon Grant<jg-hus3n9K41k0@public.gmane.org> wrote: >> Hello >> >> I was looking at the man pages looking for a way to get a string of the >> errno value meaning. This is kind of a user question. >> >> This API returns "returns a pointer to a string that describes the error >> code": >> >> http://man7.org/linux/man-pages/man3/strerror.3.html >> >> However, this is a description, e.g. "Invalid argument". Is there a >> function that would return "EINVAL" or "ENOENT" as the string? > > None that I know of. (In passing, I dealt with exactly this problem > for my book with a script that generated the string names; see > http://man7.org/tlpi/code/online/dist/lib/ename.c.inc.html and > http://man7.org/tlpi/code/online/dist/lib/error_functions.c.html) Interesting. I saw on the ename.c page that the numbers were in the table hard coded -- is it guaranteed that 90 will always correspond to EPROTOTYPE on a unixy system? >> Could I suggest that the text on the man page be updated to clarify what >> would be returned: >> >> "returns a pointer to a string that describes the error code. e.g. "Invalid >> argument" if EINVAL was the errnum." > > Done for 3.40. Great, thank you! Jon -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 4+ messages in thread
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* Re: Is there a way to get "EINVAL" style string [not found] ` <4FA99139.90102-hus3n9K41k0@public.gmane.org> @ 2012-05-08 22:30 ` Michael Kerrisk (man-pages) 0 siblings, 0 replies; 4+ messages in thread From: Michael Kerrisk (man-pages) @ 2012-05-08 22:30 UTC (permalink / raw) To: Jon Grant; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA Hi Jon, >>> I was looking at the man pages looking for a way to get a string of the >>> errno value meaning. This is kind of a user question. >>> >>> This API returns "returns a pointer to a string that describes the error >>> code": >>> >>> http://man7.org/linux/man-pages/man3/strerror.3.html >>> >>> However, this is a description, e.g. "Invalid argument". Is there a >>> function that would return "EINVAL" or "ENOENT" as the string? >> >> >> None that I know of. (In passing, I dealt with exactly this problem >> for my book with a script that generated the string names; see >> http://man7.org/tlpi/code/online/dist/lib/ename.c.inc.html and >> http://man7.org/tlpi/code/online/dist/lib/error_functions.c.html) > > > Interesting. I saw on the ename.c page that the numbers were in the table > hard coded -- is it guaranteed that 90 will always correspond to EPROTOTYPE > on a unixy system? No. So, my build code deals with this by using a script to build a platform-specific ename.c.inc file (have a look at the tarball.) Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-05-08 22:30 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-04-22 11:14 Is there a way to get "EINVAL" style string Jon Grant [not found] ` <4F93E7FC.1020904-hus3n9K41k0@public.gmane.org> 2012-04-22 21:25 ` Michael Kerrisk (man-pages) [not found] ` <CAKgNAkjP-SZXceGDaBeuNE9onk_w9-8rX1uk-XE2dRu5x8uz_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2012-05-08 21:33 ` Jon Grant [not found] ` <4FA99139.90102-hus3n9K41k0@public.gmane.org> 2012-05-08 22:30 ` Michael Kerrisk (man-pages)
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