NAME

pget — locate a process by number

SYNOPSIS

#include <sys/param.h>
#include <sys/proc.h>

int
pget(pid_t pid, int flags, struct proc **pp);

DESCRIPTION

This function takes a pid as its argument, which can be either a process or thread id, and fills a pointer to the proc structure in *pp. In the latter case, a process owning the specified thread is looked for. The operation is performed by invoking the pfind(9) function. The found process is returned locked. For the PGET_HOLD case, it is returned unlocked (but held). The pget() function can perform additional manipulations, depending on a flags argument.

The flags argument is the logical OR of some subset of:

PGET_HOLD

If set, the found process will be held and unlocked.

PGET_CANSEE

If set, the found process will be checked for its visibility. See p_cansee(9).

PGET_CANDEBUG

If set, the found process will be checked for its debuggability. See p_candebug(9).

PGET_ISCURRENT

If set, the found process will be checked that it matches the current process context.

PGET_NOTWEXIT

If set, the found process will be checked that it does not have the process flag P_WEXIT set.

PGET_NOTINEXEC

If set, the found process will be checked that it does not have the process flag P_INEXEC set.

PGET_NOTID

If set, pid is not assumed as a thread id for values larger than PID_MAX.

PGET_WANTREAD

If set, the found process will be checked that the caller may get a read access to its structure. A shorthand for (PGET_HOLD | PGET_CANDEBUG | PGET_NOTWEXIT).

RETURN VALUES

If the process is found in the specified way, then zero is returned, otherwise an appropriate error code is returned.

SEE ALSO

p_candebug(9), p_cansee(9), pfind(9)