setpgrp man page on FreeBSD

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SETPGID(2)		    BSD System Calls Manual		    SETPGID(2)

     setpgid, setpgrp — set process group

     Standard C Library (libc, -lc)

     #include <unistd.h>

     setpgid(pid_t pid, pid_t pgrp);

     setpgrp(pid_t pid, pid_t pgrp);

     The setpgid() system call sets the process group of the specified process
     pid to the specified pgrp.	 If pid is zero, then the call applies to the
     current process.

     If the affected process is not the invoking process, then it must be a
     child of the invoking process, it must not have performed an exec(3)
     operation, and both processes must be in the same session.	 The requested
     process group ID must already exist in the session of the caller, or it
     must be equal to the target process ID.

     The setpgid() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the

     The setpgrp() system call is identical to setpgid(), and is retained for
     calling convention compatibility with historical versions of BSD.

     The setpgid() system call will fail and the process group will not be
     altered if:

     [EINVAL]		The requested process group ID is not legal.

     [ESRCH]		The requested process does not exist.

     [ESRCH]		The target process is not the calling process or a
			child of the calling process.

     [EACCES]		The requested process is a child of the calling
			process, but it has performed an exec(3) operation.

     [EPERM]		The target process is a session leader.

     [EPERM]		The requested process group ID is not in the session
			of the caller, and it is not equal to the process ID
			of the target process.


     The setpgid() system call is expected to conform to ISO/IEC 9945-1:1990

BSD			       February 8, 2004				   BSD

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