diff options
Diffstat (limited to 'nuttx/configs/README.txt')
| -rw-r--r-- | nuttx/configs/README.txt | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt index 7da0aa062a..1a5e3c9d7b 100644 --- a/nuttx/configs/README.txt +++ b/nuttx/configs/README.txt @@ -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 |