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Mon, 10 May 2021 10:56:53 -0700 (PDT) From: Alejandro Colomar To: mtk.manpages@gmail.com Cc: Florian Weimer , Jakub Wilk , Alejandro Colomar , linux-man@vger.kernel.org, libc-alpha@sourceware.org Subject: [PATCH 25/39] alloc_hugepages.2, arch_prctl.2, capget.2, clone.2, delete_module.2, exit_group.2, get_robust_list.2, getunwind.2, init_module.2: Add note about the use of syscall(2) Date: Mon, 10 May 2021 19:55:34 +0200 Message-Id: <20210510175546.28445-26-alx.manpages@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510175546.28445-1-alx.manpages@gmail.com> References: <20210510175546.28445-1-alx.manpages@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Signed-off-by: Alejandro Colomar --- man2/alloc_hugepages.2 | 5 +++++ man2/arch_prctl.2 | 6 ++++++ man2/capget.2 | 5 +++++ man2/clone.2 | 6 ++++++ man2/delete_module.2 | 6 ++++++ man2/exit_group.2 | 6 ++++++ man2/get_robust_list.2 | 5 +++++ man2/getunwind.2 | 6 ++++++ man2/init_module.2 | 5 +++++ 9 files changed, 50 insertions(+) diff --git a/man2/alloc_hugepages.2 b/man2/alloc_hugepages.2 index cc76fc495..47f9da6b0 100644 --- a/man2/alloc_hugepages.2 +++ b/man2/alloc_hugepages.2 @@ -35,6 +35,11 @@ alloc_hugepages, free_hugepages \- allocate or free huge pages .BI "int syscall(SYS_free_hugepages, void *" addr ); .\" asmlinkage int sys_free_hugepages(unsigned long addr); .fi +.PP +.IR Note : +glibc provides no wrappers for these system calls, +necessitating the use of +.BR syscall (2). .SH DESCRIPTION The system calls .BR alloc_hugepages () diff --git a/man2/arch_prctl.2 b/man2/arch_prctl.2 index 7ae5b350c..982416761 100644 --- a/man2/arch_prctl.2 +++ b/man2/arch_prctl.2 @@ -34,6 +34,12 @@ arch_prctl \- set architecture-specific thread state .BI "int syscall(SYS_arch_prctl, int " code ", unsigned long " addr ); .BI "int syscall(SYS_arch_prctl, int " code ", unsigned long *" addr ); .fi +.PP +.IR Note : +glibc provides no wrapper for +.BR arch_prctl (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION .BR arch_prctl () sets architecture-specific process or thread state. diff --git a/man2/capget.2 b/man2/capget.2 index 9dbc0404c..3ac05106f 100644 --- a/man2/capget.2 +++ b/man2/capget.2 @@ -28,6 +28,11 @@ capget, capset \- set/get capabilities of thread(s) .BI "int syscall(SYS_capset, cap_user_header_t " hdrp , .BI " const cap_user_data_t " datap ); .fi +.PP +.IR Note : +glibc provides no wrappers for these system calls, +necessitating the use of +.BR syscall (2). .SH DESCRIPTION These two system calls are the raw kernel interface for getting and setting thread capabilities. diff --git a/man2/clone.2 b/man2/clone.2 index 04b4ec38c..e381da165 100644 --- a/man2/clone.2 +++ b/man2/clone.2 @@ -63,6 +63,12 @@ clone, __clone2, clone3 \- create a child process .PP .BI "long syscall(SYS_clone3, struct clone_args *" cl_args ", size_t " size ); .fi +.PP +.IR Note : +glibc provides no wrapper for +.BR clone3 (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION These system calls create a new ("child") process, in a manner similar to diff --git a/man2/delete_module.2 b/man2/delete_module.2 index 21c9e9d8d..3b14111c5 100644 --- a/man2/delete_module.2 +++ b/man2/delete_module.2 @@ -33,6 +33,12 @@ delete_module \- unload a kernel module .PP .BI "int syscall(SYS_delete_module, const char *" name ", unsigned int " flags ); .fi +.PP +.IR Note : +glibc provides no wrapper for +.BR delete_module (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION The .BR delete_module () diff --git a/man2/exit_group.2 b/man2/exit_group.2 index d197f1f2e..1533529f8 100644 --- a/man2/exit_group.2 +++ b/man2/exit_group.2 @@ -32,6 +32,12 @@ exit_group \- exit all threads in a process .PP .BI "noreturn void syscall(SYS_exit_group, int " status ); .fi +.PP +.IR Note : +glibc provides no wrapper for +.BR exit_group (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION This system call is equivalent to .BR _exit (2) diff --git a/man2/get_robust_list.2 b/man2/get_robust_list.2 index d1b1c59bc..66b27d905 100644 --- a/man2/get_robust_list.2 +++ b/man2/get_robust_list.2 @@ -42,6 +42,11 @@ get_robust_list, set_robust_list \- get/set list of robust futexes .BI "long syscall(SYS_set_robust_list," .BI " struct robust_list_head *" head ", size_t " len ); .fi +.PP +.IR Note : +glibc provides no wrappers for these system calls, +necessitating the use of +.BR syscall (2). .SH DESCRIPTION These system calls deal with per-thread robust futex lists. These lists are managed in user space: diff --git a/man2/getunwind.2 b/man2/getunwind.2 index 403bd7770..0935497c6 100644 --- a/man2/getunwind.2 +++ b/man2/getunwind.2 @@ -35,6 +35,12 @@ getunwind \- copy the unwind data to caller's buffer .PP .BI "long syscall(SYS_getunwind, void " *buf ", size_t " buf_size ); .fi +.PP +.IR Note : +glibc provides no wrapper for +.BR getunwind (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION .I Note: this system call is obsolete. .PP diff --git a/man2/init_module.2 b/man2/init_module.2 index 13d1b7f0a..aac0c6631 100644 --- a/man2/init_module.2 +++ b/man2/init_module.2 @@ -38,6 +38,11 @@ init_module, finit_module \- load a kernel module .BI "int syscall(SYS_finit_module, int " fd ", const char *" param_values , .BI " int " flags ); .fi +.PP +.IR Note : +glibc provides no wrappers for these system calls, +necessitating the use of +.BR syscall (2). .SH DESCRIPTION .BR init_module () loads an ELF image into kernel space, -- 2.31.1