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pget — locate a process by number
#include <sys/param.h> #include <sys/proc.h> int pget(pid_t pid, int flags, struct proc **pp);
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).
If the process is found in the specified way, then zero is returned, otherwise an appropriate error code is returned.
p_candebug(9), p_cansee(9), pfind(9)