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[v4,11/35] clone.2: Use syscall(SYS_...); for system calls without a wrapper

Message ID 20210403194026.102818-12-alx.manpages@gmail.com
State Not Applicable
Headers show
Series SYNOPSIS: Use syscall(SYS_...); and fix '#include's | expand

Commit Message

Alejandro Colomar \(man-pages\) April 3, 2021, 7:40 p.m. UTC
The CLONE_* constants seem to be available from either
<linux/sched.h> or <sched.h>, and since clone3() already
includes <linux/sched.h> for 'struct clone_args', <sched.h>
is not really needed, AFAICS; however, to avoid confussion,
I also included <sched.h> for clone3() for consistency:

clone() is getting CLONE_* from <sched.h>, and it would confuse
the reader if clone3() got the same CLONE_* constants from a
different header.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---
 man2/clone.2 | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)
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Patch

diff --git a/man2/clone.2 b/man2/clone.2
index fa7d1103e..f455c97d8 100644
--- a/man2/clone.2
+++ b/man2/clone.2
@@ -56,13 +56,13 @@  clone, __clone2, clone3 \- create a child process
 .PP
 /* For the prototype of the raw clone() system call, see NOTES */
 .PP
-.BI "long clone3(struct clone_args *" cl_args ", size_t " size );
-.fi
+.BR "#include <linux/sched.h>" "    /* Definition of " "struct clone_args" " */"
+.BR "#include <sched.h>" "          /* Definition of " CLONE_* " constants */"
+.BR "#include <sys/syscall.h>" "    /* Definition of " SYS_* " constants */"
+.B #include <unistd.h>
 .PP
-.IR Note :
-There is no glibc wrapper for
-.BR clone3 ();
-see NOTES.
+.BI "long syscall(SYS_clone3, struct clone_args *" cl_args ", size_t " size );
+.fi
 .SH DESCRIPTION
 These system calls
 create a new ("child") process, in a manner similar to
@@ -1541,11 +1541,6 @@  One use of these systems calls
 is to implement threads: multiple flows of control in a program that
 run concurrently in a shared address space.
 .PP
-Glibc does not provide a wrapper for
-.BR clone3 ();
-call it using
-.BR syscall (2).
-.PP
 Note that the glibc
 .BR clone ()
 wrapper function makes some changes