diff options
| -rw-r--r-- | manual/startup.texi | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/manual/startup.texi b/manual/startup.texi index 9545fcc526..11fe58c5a6 100644 --- a/manual/startup.texi +++ b/manual/startup.texi @@ -737,6 +737,12 @@ anyway. @code{syscall} does not provide cancellation logic, even if the system call you're calling is listed as cancellable above. +Using @code{syscall} with system calls that affect the internal state of +process of thread will likely result in undefined behavior. For this reason, +at least the following system call numbers are not supported when invoked via +@code{syscall}: @code{SYS_clone}, @code{SYS_clone2}, @code{SYS_clone3}, +@code{SYS_rt_sigreturn}, @code{SYS_sigreturn}, @code{SYS_vfork}. + @code{syscall} is declared in @file{unistd.h}. @deftypefun {long int} syscall (long int @var{sysno}, @dots{}) @@ -804,7 +810,6 @@ if (rc == -1) @end deftypefun - @node Program Termination @section Program Termination @cindex program termination |