diff options
Diffstat (limited to 'nuttx/libc/Kconfig')
| -rw-r--r-- | nuttx/libc/Kconfig | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/nuttx/libc/Kconfig b/nuttx/libc/Kconfig index 699b3ebb2..d739b6351 100644 --- a/nuttx/libc/Kconfig +++ b/nuttx/libc/Kconfig @@ -72,15 +72,17 @@ config EOL_IS_EITHER_CRLF endchoice config LIBC_EXECFUNCS - bool "Enable exec[l|v] Support" + bool "Enable exec[l|v] / posix_spawn() Support" default n depends on !BINFMT_DISABLE ---help--- Enable support for the exec[l|v] family of functions that can be - used to start other programs, terminating the current program. - Typical usage is (1) first call vfork() to create a new thread, then - (2) call exec[l|v] to replace the new thread with a program from the - file system. + used to start other programs, terminating the current program and + the posix_spawn() familty of functions that can be used start other + programs without terminating the current program. The typical + usage of the exec[l|v] functions is (1) first call vfork() to create + a new thread, then (2) call exec[l|v] to replace the new thread with + a program from the file system. NOTE 1: This two step process start is completely unnecessary in NuttX and is provided only for compatibily with Unix systems. These @@ -89,9 +91,11 @@ config LIBC_EXECFUNCS the new thread will be terminated by the exec[l|v] call, it really served no purpose other than to suport Unix compatility. - NOTE 2: Support for exec[l|v] is conditional because is requires - additional support for symbol tables that will not be available in - the typical system. + The posix_spawn() functions do not have this inefficiency. + + NOTE 2: Support for exec[l|v] and posix_spawn() is conditional + because they require additional support for symbol tables that + will not be available in the typical system. if LIBC_EXECFUNCS @@ -99,8 +103,8 @@ config EXECFUNCS_SYMTAB string "Symbol table used by exec[l|v]" default "g_symtab" ---help--- - The exec[l|v] functions are wrapper functions that (1) call the non- - standard binfmt function 'exec', and then (2) exit(0). The binfmt + The exec[l|v] and posix_spawn() functions are wrapper functions that + call the non-standard binfmt function 'exec'). The binfmt function 'exec' needs to have (1) a symbol table that provides the list of symbols exported by the base code, and (2) the number of symbols in that table. This selection provides the name of that @@ -110,8 +114,8 @@ config EXECFUNCS_NSYMBOLS int "Number of Symbols in the Table" default 0 ---help--- - The exec[l|v] functions are wrapper functions that (1) call the non- - standard binfmt function 'exec', and then (2) exit(0). The binfmt + The exec[l|v] and posix_spawn() functions are wrapper functions that + call the non-standard binfmt function 'exec'). The binfmt function 'exec' needs to have (1) a symbol table that provides the list of symbols exported by the base code, and (2) the number of symbols in that table. This selection provides the number of |