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TCSETPGRP(3) Library Functions Manual TCSETPGRP(3)

tcsetpgrp
set foreground process group ID

#include <unistd.h>
int
tcsetpgrp(int fd, pid_t pgrp_id);

If the process has a controlling terminal, the tcsetpgrp() function sets the foreground process group ID associated with the terminal device to pgrp_id. The terminal device associated with fd must be the controlling terminal of the calling process and the controlling terminal must be currently associated with the session of the calling process. The value of pgrp_id must be the same as the process group ID of a process in the same session as the calling process.
If the calling process is a member of a background process group, the process group will be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the process is allowed to perform the operation and the SIGTTOU signal is not sent.
Upon successful completion, tcsetpgrp() returns a value of zero.

If an error occurs, tcsetpgrp() returns -1 and the global variable errno is set to indicate the error, as follows:
 
 
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The fd argument is not a valid file descriptor.
 
 
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The tcsetpgrp() function was interrupted by a signal.
 
 
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An invalid value of pgrp_id was specified.
 
 
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The calling process does not have a controlling terminal, or the file represented by fd is not the controlling terminal, or the controlling terminal is no longer associated with the session of the calling process.
 
 
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The pgrp_id argument does not match the process group ID of a process in the same session as the calling process.

setpgid(2), setsid(2), tcgetpgrp(3)

The tcsetpgrp() function is expected to be compliant with the IEEE Std 1003.1-1988 (“POSIX.1”) specification.
March 7, 2017 OpenBSD-current