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#include <unistd.h>
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.
[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. | |
SETPGID (2) | February 8, 2004 |
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