bsd/man/man2/getpid.2

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  34 .\"     @(#)getpid.2    8.1 (Berkeley) 6/4/93
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  36 .Dd June 4, 1993
  37 .Dt GETPID 2
  38 .Os BSD 4
  39 .Sh NAME
  40 .Nm getpid ,
  41 .Nm getppid
  42 .Nd get parent or calling process identification
  43 .Sh SYNOPSIS
  44 .Fd #include <unistd.h>
  45 .Ft pid_t
  46 .Fo getpid
  47 .Fa void
  48 .Fc
  49 .Ft pid_t
  50 .Fo getppid
  51 .Fa void
  52 .Fc
  53 .Sh DESCRIPTION
  54 .Fn getpid
  55 returns
  56 the process ID of
  57 the calling process.
  58 The ID is guaranteed to be unique and is
  59 useful for constructing temporary file names.
  60 .Pp
  61 .Fn getppid
  62 returns the process ID of the parent
  63 of the calling process.
  64 .Sh ERRORS
  65 The
  66 .Fn getpid
  67 and
  68 .Fn getppid
  69 functions are always successful, and no return value is reserved to
  70 indicate an error.
  71 .Sh LEGACY SYNOPSIS
  72 .Fd #include <sys/types.h>
  73 .Fd #include <unistd.h>
  74 .Pp
  75 The include file
  76 .In sys/types.h
  77 is necessary.
  78 .Sh SEE ALSO
  79 .Xr gethostid 2 ,
  80 .Xr compat 5
  81 .Sh STANDARDS
  82 .Fn getpid
  83 and
  84 .Fn getppid
  85 conform to
  86 .St -p1003.1-88 .