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killpg(2) System Calls Manual killpg(2) NAME killpg - Sends a signal to a process group LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <signal.h> int killpg( pid_t process_grp, int signal); Application developers may want to specify an #include statement for <sys/types.h> before the one for <signal.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. STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: killpg(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the process group. Specifies the signal. If the signal para- meter is a value of 0 (zero, the null signal), error checking is per- formed but no signal is sent. This parameter can be used to check the validity of the process parameter. DESCRIPTION The killpg() function sends the signal specified by the signal parame- ter to the group of processes specified by the process_grp parameter. The process sending the signal must have the same effective user ID or saved set-user-ID as the members of the process group, or the sending process must belong to the superuser. The continue signal, SIGCONT, is a special case: it may be sent to any process that is a descendent of the current process. RETURN VALUES Upon successful completion, the killpg() function returns a value of 0 (zero). Otherwise, a value of -1 is returned, and errno is set to indi- cate the error. ERRORS If any of the following conditions occurs, the killpg() function sets errno to the corresponding value: The signal parameter is not a valid signal number. No process can be found in process_grp. [Digital] The process group was given as 0 (zero), but the sending process does not have a process group. The real or saved user ID does not match the real or effective user ID of the receiving process, the calling process does not have the ap- propriate privilege, and the process is not sending a SIGCONT signal to one of its session's processes. RELATED INFORMATION Functions: getpid(2), kill(2), raise(3), setpgid(2), sigaction(2), sigvec(2) Standards: standards(5) delim off killpg(2)