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tcsetpgrp(3) Library Functions Manual tcsetpgrp(3) NAME tcsetpgrp - Sets foreground process group ID LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <unistd.h> int tcsetpgrp( int filedes, pid_t pgrp_id ); Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being de- veloped for multiple platforms. The additional #include statement is not required on DIGITAL UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these stan- dards. PARAMETERS Specifies an open file descriptor. Specifies the process group identi- fier. DESCRIPTION If the process has a controlling terminal, the tcsetpgrp() function sets the foreground process group ID associated with the terminal to the value of the pgrp_id parameter. The file associated with the filedes parameter 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 the pgrp_id parameter must match a process group ID of a process in the same session as the calling process. RETURN VALUES Upon successful completion, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS The tcsetpgrp() function sets errno to the specified values for the following conditions: The filedes parameter is not a valid file descriptor. The pgrp_id pa- rameter is invalid. The calling process does not have a controlling terminal, the file is not the controlling terminal, or the controlling terminal is no longer associated with the session of the calling process. The value of the pgrp_id parameter does not match the process group ID of a process in the same session as the calling process. RELATED INFORMATION Functions: tcgetpgrp (3) Standards: standards(5) delim off tcsetpgrp(3)