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.Dd May 11, 2016 .Dt PSETFLAGS 3PROC .Os .Sh NAME .Nm Psetflags .Nm Punsetflags .Nd set and unset process flags .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo Psetflags .Fa "struct ps_prochandle *P" .Fa "long flags" .Fc .Ft int .Fo Punsetflags .Fa "struct ps_prochandle *P" .Fa "long flags" .Fc .Sh DESCRIPTION The .Fn Psetflags and .Fn Punsetflags functions manipulate the process flags for the process handle .Fa P . The process flags determine how the process behaves in the face of various actions. For example, setting the .Sy PR_FORK flag indicates that the tracing flags of the process and the inherit-on-fork mode should be set on children. A full list of the process flags is available in the .Sy PCSET section in .Xr proc 4 .

p The .Fn Psetflags function sets the flags specified in .Fa flags by doing a bitwise-inclusive-OR with the previously set flags.

p The .Fn Punsetflags function removes the flags specified in .Fa flags from the tracing flags of the process. Items not listed in .Fa flags will remain.

p To see the current set of flags active on the process, check the .Sy pr_flags member of the .Sy pstatus_t for the process. It can be obtained through the .Xr Pstatus 3PROC function.

p Note, attempting to modify the process flags only works on active processes. Attempting to call these functions of process handles corresponding to core files, zombie processes, or files, will result in an error. .Sh RETURN VALUES Upon successful completion, the .Fn Psetflags and .Fn Punsetflags functions return .Sy 0 . Otherwise, .Sy -1 is returned and .Sy errno is set to indicate the error. .Sh ERRORS For a full list of possible errors see the .Sy DIAGNOSTICS section in .Xr proc 4 . .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr libproc 3LIB , .Xr Pstatus 3PROC , .Xr proc 4