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Test Your Knowledge in Computers #686
Difficulty: Medium
In reverse Polish notation, the operators follow their operands; for instance, to add 3 and 4, one would write 3 4 + rather than 3 + 4.
True or False?
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setpgrp(2) [bsd man page]

SETPGRP(2)							System Calls Manual							SETPGRP(2)

NAME
setpgrp - set process group SYNOPSIS
setpgrp(pid, pgrp) int pid, pgrp; DESCRIPTION
Setpgrp 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 invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process. RETURN VALUE
Setpgrp returns when the operation was successful. If the request failed, -1 is returned and the global variable errno indicates the rea- son. ERRORS
Setpgrp will fail and the process group will not be altered if one of the following occur: [ESRCH] The requested process does not exist. [EPERM] The effective user ID of the requested process is different from that of the caller and the process is not a descendent of the calling process. SEE ALSO
getpgrp(2) 4th Berkeley Distribution May 9, 1985 SETPGRP(2)

Check Out this Related Man Page

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

NAME
setpgid, setpgrp -- set process group SYNOPSIS
#include <unistd.h> int setpgid(pid_t pid, pid_t pgrp); int setpgrp(pid_t pid, pid_t pgrp); DESCRIPTION
Setpgid() 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 invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process. RETURN VALUES
Setpgid() returns 0 when the operation was successful. If the request failed, -1 is returned and the global variable errno indicates the reason. ERRORS
Setpgid() will fail and the process group will not be altered if: [EACCES] The value of the pid argument matches the process ID of a child process of the calling process, and the child process has successfully executed one of the exec functions. [EPERM] The effective user ID of the requested process is different from that of the caller and the process is not a descendant of the calling process. [ESRCH] The value of the pid argument does not match the process ID of the calling process or of a child process of the calling process. SEE ALSO
getpgrp(2) STANDARDS
The setpgid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1''). COMPATIBILITY
Setpgrp() is identical to setpgid(), and is retained for calling convention compatibility with historical versions of BSD. 4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution

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