Comment by t-3
1 month ago
That's the syscall(9) manpage, not the syscalls(2) manpage. syscall(9) is present on BSD as well, and on my OpenBSD box points me to sys/syscall.h which has the syscalls. On linux sys/syscall.h is empty and includes asm/unistd.h.
The manpage syscall(2) exists on both Linux and FreeBSD, while syscall(9) does not exist on either of them.
On Linux there is also a syscalls(2) manpage, while no syscalls page exists on FreeBSD.
These man pages belong to libc (e.g. glibc on Linux), not to the kernel. This distinction does not matter on FreeBSD and other *BSD, where the kernel and the standard C library are always synchronized, but it matters on Linux, where glibc and the kernel are developed independently, so their lists of syscalls are not the same. Typically glibc is synchronized with an older Linux kernel, not with your current kernel.
Ah, you're right. syscall(2) must have been moved to syscall(9) on OpenBSD when the syscall function was removed and pinsyscalls was added.