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task_spawn() and posix_spawn() are NuttX OS interfaces.  In PROTECTED and KERNEL build modes, then can be reached from applications only via a system call.  Currently, the number of parameters in a system call is limited to six; these spawn function have seven parameters.  Rather than extend the maximum number of parameters across all architectures, I opted instead to marshal the seven parameters into a structure.
     *

In order to support builtin in function in protected mode, a task_spawn() system call must be supported.  Unfortunately this is overly complex because there is a (soft) limit of 6 parameters in a system call; task_spawn has seven paramters.  This is a soft limit but still difficult to extend because it involves assembly language changes to numerous architectures.  Better to get more creative.
This commit is contained in:
Gregory Nutt
2019-08-23 13:20:52 -06:00
parent bff30ff9bc
commit 3c30cf1f05
8 changed files with 164 additions and 5 deletions
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syscall/syscall.csv
+1 -2
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@@ -63,6 +63,7 @@
"mq_timedreceive","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","ssize_t","mqd_t","char*","size_t","FAR unsigned int*","const struct timespec*"
"mq_timedsend","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","mqd_t","const char*","size_t","unsigned int","const struct timespec*"
"mq_unlink","mqueue.h","!defined(CONFIG_DISABLE_MQUEUE)","int","const char*"
"nx_task_spawn","nuttx/spawn.h","!defined(CONFIG_BUILD_KERNEL)","int","FAR const struct spawn_syscall_parms_s *"
"nx_vsyslog","nuttx/syslog/syslog.h","","int","int","FAR const IPTR char*","FAR va_list*"
"on_exit","stdlib.h","defined(CONFIG_SCHED_ONEXIT)","int","CODE void (*)(int, FAR void *)","FAR void *"
"open","fcntl.h","","int","const char*","int","..."
@@ -162,7 +163,6 @@
"stat","sys/stat.h","","int","const char*","FAR struct stat*"
"statfs","sys/statfs.h","","int","FAR const char*","FAR struct statfs*"
"task_create","sched.h","!defined(CONFIG_BUILD_KERNEL)", "int","FAR const char*","int","int","main_t","FAR char * const []|FAR char * const *"
#"task_create","sched.h","","int","const char*","int","main_t","FAR char * const []|FAR char * const *"
"task_delete","sched.h","","int","pid_t"
"task_restart","sched.h","","int","pid_t"
"task_setcancelstate","sched.h","","int","int","FAR int*"
@@ -180,7 +180,6 @@
"unlink","unistd.h","!defined(CONFIG_DISABLE_MOUNTPOINT)","int","FAR const char*"
"unsetenv","stdlib.h","!defined(CONFIG_DISABLE_ENVIRON)","int","const char*"
"up_assert","assert.h","","void","FAR const uint8_t*","int"
#"up_assert","assert.h","","void"
"vfork","unistd.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_ARCH_HAVE_VFORK)","pid_t"
"wait","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","pid_t","int*"
"waitid","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","int","idtype_t","id_t"," FAR siginfo_t *","int"
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