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Update recommendation for CONFIGURE_MAXIMUM_FILE_DESCRIPTORS

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This commit is contained in:
Michael Davidsaver
2023-04-28 10:38:34 -05:00
parent f56412d6a5
commit fe9995c0b5
1 changed files with 13 additions and 1 deletions
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14
modules/libcom/RTEMS/posix/rtems_config.c
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@@ -60,7 +60,19 @@ extern void *POSIX_Init(void *argument);
#define CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER
/* Max FDs cannot exceed FD_SETSIZE from newlib (64) */
/* Note: The select() system call can only be used with the first FD_SETSIZE
* File Descriptors (newlib default is 64). Beginning RTEMS 5.1, FDs are
* allocated sequentially. So changing this CONFIGURE parameter such
* that CONFIGURE_MAXIMUM_FILE_DESCRIPTORS >= FD_SETSIZE will likely
* cause applications making select() calls to fault at some point.
*
* IOC core components (libca and RSRV) do not make select() calls.
*
* Applications and driver code using poll() or other socket
* multiplexers do not share this limitation.
*
* cf. https://github.com/epics-base/epics-base/issues/300
*/
#define CONFIGURE_MAXIMUM_FILE_DESCRIPTORS 64
#define CONFIGURE_IMFS_ENABLE_MKFIFO 2