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| 32 | .\" @(#)getpgrp.2 6.4 (Berkeley) 3/10/91 |
| 33 | .\" |
| 34 | .Dd March 10, 1991 |
| 35 | .Dt GETPGRP 2 |
| 36 | .Os BSD 4.2 |
| 37 | .Sh NAME |
| 38 | .Nm getpgrp |
| 39 | .Nd get process group |
| 40 | .Sh SYNOPSIS |
| 41 | .Fd #include <unistd.h> |
| 42 | .Ft pid_t |
| 43 | .Fn getpgrp "void" |
| 44 | .Sh DESCRIPTION |
| 45 | The process group of the current process is returned by |
| 46 | .Fn getpgrp . |
| 47 | .Pp |
| 48 | Process groups are used for distribution of signals, and |
| 49 | by terminals to arbitrate requests for their input: processes |
| 50 | that have the same process group as the terminal are foreground |
| 51 | and may read, while others will block with a signal if they attempt |
| 52 | to read. |
| 53 | .Pp |
| 54 | This call is thus used by programs such as |
| 55 | .Xr csh 1 |
| 56 | to create |
| 57 | process groups |
| 58 | in implementing job control. |
| 59 | The |
| 60 | .Dv TIOCGPGRP |
| 61 | and |
| 62 | .Dv TIOCSPGRP |
| 63 | calls |
| 64 | described in |
| 65 | .Xr termios 4 |
| 66 | are used to get/set the process group of the control terminal. |
| 67 | .Sh SEE ALSO |
| 68 | .Xr setpgrp 2 , |
| 69 | .Xr getuid 2 , |
| 70 | .Xr termios 4 |
| 71 | .Sh HISTORY |
| 72 | The |
| 73 | .Nm |
| 74 | function call appeared in |
| 75 | .Bx 4.0 . |
| 76 | .Sh STANDARDS |
| 77 | The |
| 78 | .Fn getpgrp |
| 79 | function conforms to IEEE Std 1003.1-1988 |
| 80 | .Pq Dq Tn POSIX . |
| 81 | .Sh COMPATABILITY |
| 82 | This version of |
| 83 | .Fn getpgrp |
| 84 | differs from past Berkeley versions by not taking a |
| 85 | .Fa "pid_t pid" |
| 86 | argument. |
| 87 | This incompatibility is required by |
| 88 | .St -p1003.1-88 . |