getpid.2

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 2 代码 · 共 43 行

.\" SCCSID: @(#)getpid.2	2.2	4/10/87
.TH getpid 2
.SH Name
getpid, getppid \- get process identification
.SH Syntax
.ft B
.nf
.B #include <sys/types.h>
.B #include <unistd.h>
.PP
.B pid = getpid()
.B pid_t pid;
.sp
.B ppid = getppid()
.B pid_t ppid;
.fi
.SH Description
.NXR "getpid system call"
.NXR "getppid system call"
.NXR "process ID" "getting"
The
.PN getpid
system call returns the process ID of the current process.
Most often it is used, with the host identifier 
.PN gethostid , 
to generate uniquely named temporary files.
.SH Return Values
The
.PN getppid
system call returns the process ID of the parent
of the current process. 
.SH Environment
.SS POSIX
When your program is compiled in POSIX mode,
the
.PN getpid
and
.PN getppid
functions return a value of type 
.I pid_t.
.SH See Also
gethostid(2)