diff options
Diffstat (limited to 'man2/wait.2')
| -rw-r--r-- | man2/wait.2 | 51 |
1 files changed, 27 insertions, 24 deletions
diff --git a/man2/wait.2 b/man2/wait.2 index e2dcd59bda..7386dffef9 100644 --- a/man2/wait.2 +++ b/man2/wait.2 @@ -460,7 +460,34 @@ or .I pid is equal to .BR INT_MIN . +.SH VERSIONS +.SS C library/kernel differences +.BR wait () +is actually a library function that (in glibc) is implemented as a call to +.BR wait4 (2). +.PP +On some architectures, there is no +.BR waitpid () +system call; +.\" e.g., i386 has the system call, but not x86-64 +instead, this interface is implemented via a C library +wrapper function that calls +.BR wait4 (2). +.PP +The raw +.BR waitid () +system call takes a fifth argument, of type +.IR "struct rusage\ *" . +If this argument is non-NULL, +then it is used to return resource usage information about the child, +in the same manner as +.BR wait4 (2). +See +.BR getrusage (2) +for details. .SH STANDARDS +POSIX.1-2008. +.SH HISTORY SVr4, 4.3BSD, POSIX.1-2001. .SH NOTES A child that terminates, but has not been waited for becomes a "zombie". @@ -577,30 +604,6 @@ Since Linux 4.7, the .B __WALL flag is automatically implied if the child is being ptraced. -.SS C library/kernel differences -.BR wait () -is actually a library function that (in glibc) is implemented as a call to -.BR wait4 (2). -.PP -On some architectures, there is no -.BR waitpid () -system call; -.\" e.g., i386 has the system call, but not x86-64 -instead, this interface is implemented via a C library -wrapper function that calls -.BR wait4 (2). -.PP -The raw -.BR waitid () -system call takes a fifth argument, of type -.IR "struct rusage\ *" . -If this argument is non-NULL, -then it is used to return resource usage information about the child, -in the same manner as -.BR wait4 (2). -See -.BR getrusage (2) -for details. .SH BUGS According to POSIX.1-2008, an application calling .BR waitid () |