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Manuál Linux
[Linux manuál]

tcgetpgrp: získat ID skupiny procesů v popředí

Originální popis anglicky: tcgetpgrp - get the foreground process group ID

Návod, kniha: POSIX Programmer's Manual

STRUČNĚ

#include <unistd.h>
 
 
pid_t tcgetpgrp(int fildes);
 

POPIS / INSTRUKCE

The tcgetpgrp() function shall return the value of the process group ID of the foreground process group associated with the terminal.
If there is no foreground process group, tcgetpgrp() shall return a value greater than 1 that does not match the process group ID of any existing process group.
The tcgetpgrp() function is allowed from a process that is a member of a background process group; however, the information may be subsequently changed by a process that is a member of a foreground process group.

NÁVRATOVÁ HODNOTA

Upon successful completion, tcgetpgrp() shall return the value of the process group ID of the foreground process associated with the terminal. Otherwise, -1 shall be returned and errno set to indicate the error.

CHYBY / ERRORY

The tcgetpgrp() function shall fail if:
EBADF
The fildes argument is not a valid file descriptor.
ENOTTY
The calling process does not have a controlling terminal, or the file is not the controlling terminal.
 
The following sections are informative.

PŘÍKLADY POUŽITÍ

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SOUVISEJÍCÍ

setsid() , setpgid() , tcsetpgrp() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h> Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
2003 IEEE/The Open Group
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