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_exit.2: Clarify the distinction between the raw syscall and the wrapper function 

Further clarify the difference between the raw _exit() system call
and the C library wrapper.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2021-08-30 23:36:42 +02:00
parent 44803dd03b
commit d99b5be0d8
1 changed files with 14 additions and 7 deletions
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21
man2/_exit.2
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@ -112,14 +112,14 @@ canceled upon
.BR _exit (), .BR _exit (),
is implementation-dependent. is implementation-dependent.
.SS C library/kernel differences .SS C library/kernel differences
In glibc up to version 2.3, the The text above in DESCRIPTION describes the traditional effect of
.BR _exit () .BR _exit (),
wrapper function invoked the kernel system call of the same name. which is to terminate a process,
Since glibc 2.3, the wrapper function invokes and these are the semantics specified by POSIIX.1 and implemented
.BR exit_group (2), by the C library wrapper function.
in order to terminate all of the threads in a process. On modern systems, this means termination of all threads in the process.
.PP .PP
The raw By contrast with the C library wrapper function, the raw Linux
.BR _exit () .BR _exit ()
system call terminates only the calling thread, and actions such as system call terminates only the calling thread, and actions such as
reparenting child processes or sending reparenting child processes or sending
@ -127,6 +127,13 @@ reparenting child processes or sending
to the parent process are performed only if this is to the parent process are performed only if this is
the last thread in the thread group. the last thread in the thread group.
.\" _exit() is used by pthread_exit() to terminate the calling thread .\" _exit() is used by pthread_exit() to terminate the calling thread
.PP
In glibc up to version 2.3, the
.BR _exit ()
wrapper function invoked the kernel system call of the same name.
Since glibc 2.3, the wrapper function invokes
.BR exit_group (2),
in order to terminate all of the threads in a process.
.SH SEE ALSO .SH SEE ALSO
.BR execve (2), .BR execve (2),
.BR exit_group (2), .BR exit_group (2),