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Add perror()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5061 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-08-28 19:01:14 +00:00
parent 968df0679c
commit 23461a3418
1 changed files with 26 additions and 5 deletions
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31
configs/README.txt
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@ -331,7 +331,7 @@ defconfig -- This is a configuration file similar to the Linux
threads (minus 1) than can be waiting for another thread
to release a count on a semaphore. This value may be set
to zero if no more than one thread is expected to wait for
a semaphore. If defined, then this should be a relatively
a semaphore. If defined, then this should be a relatively
small number because this the number of maximumum of waiters
on one semaphore (like 4 or 8).
CONFIG_FDCLONE_DISABLE. Disable cloning of all file descriptors
@ -546,10 +546,31 @@ defconfig -- This is a configuration file similar to the Linux
Misc libc settings
CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
little smaller if we do not support fieldwidthes
CONFIG_LIBC_FLOATINGPOINT - By default, floating point
support in printf, sscanf, etc. is disabled.
CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a little smaller
if we do not support fieldwidthes
CONFIG_LIBC_FLOATINGPOINT - By default, floating point support in printf,
sscanf, etc. is disabled.
CONFIG_LIBC_STRERROR - strerror() is useful because it decodes 'errno'
values into a human readable strings. But it can also require
a lot of memory. If this option is selected, strerror() will still
exist in the build but it will not decode error values. This option
should be used by other logic to decide if it should use strerror() or
not. For example, the NSH application will not use strerror() if this
option is not selected; perror() will not use strerror() is this option
is not selected (see also CONFIG_NSH_STRERROR).
CONFIG_LIBC_STRERROR_SHORT - If this option is selected, then strerror()
will use a shortened string when it decodes the error. Specifically,
strerror() is simply use the string that is the common name for the
error. For example, the 'errno' value of 2 will produce the string
"No such file or directory" is CONFIG_LIBC_STRERROR_SHORT is not
defined but the string "ENOENT" is CONFIG_LIBC_STRERROR_SHORT is
defined.
CONFIG_LIBC_PERROR_STDOUT - POSIX requires that perror() provide its output
on stderr. This option may be defined, however, to provide perror() output
that is serialized with other stdout messages.
CONFIG_LIBC_PERROR_DEVNAME - Another non-standard option is to provide
perror() output to a logging device or file. CONFIG_LIBC_PERROR_DEVNAME
may be defined to be any write-able, character device (or file).
Allow for architecture optimized implementations