05-06-2005
Pid=0
What OS does not use PID=0? is it FreeBSD?
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question: for the below program
i just printed the value for pid, child pid and parent pid
why does it give me 6 values? i assume ppid is 28086
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can someone comment on that!
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#define DIM 8
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The below command returns full line.How can i get only PID from this line ie 15794 from the below example
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Hi All,
In my project i have two process runs in the back end.
Once i start my project, and execute the command ps, i get below output:
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9086 pts/1 0:00 ksh
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Hi,
I need to get the pid of a process and have to store the pid in a variable and i want to use this value(pid) of the variable for some process. Please can anyone tell me how to get the pid of a process and store it in a variable. please help me on this.
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Hello people,
This question might seem to be a little naive but here it goes:
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I have searched to find an anwer to no avail, I hope you can help me.
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Hello,
I would like to know what this command means?
PID=$!
what does "!" stand for? (5 Replies)
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LEARN ABOUT FREEBSD
pdgetpid
PDFORK(2) BSD System Calls Manual PDFORK(2)
NAME
pdfork, pdgetpid, pdkill, pdwait4 -- System calls to manage process descriptors
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/procdesc.h>
pid_t
pdfork(int *fdp, int flags);
int
pdgetpid(int fd, pid_t *pidp);
int
pdkill(int fd, int signum);
int
pdwait4(int fd, int *status, int options, struct rusage *rusage);
DESCRIPTION
Process descriptors are special file descriptors that represent processes, and are created using pdfork(), a variant of fork(2), which, if
successful, returns a process descriptor in the integer pointed to by fdp. Processes created via pdfork() will not cause SIGCHLD on termina-
tion. pdfork() can accept the flags:
PD_DAEMON Instead of the default terminate-on-close behaviour, allow the process to live until it is explicitly killed with kill(2).
This option is not permitted in capsicum(4) capability mode (see cap_enter(2)).
pdgetpid() queries the process ID (PID) in the process descriptor fd.
pdkill() is functionally identical to kill(2), except that it accepts a process descriptor, fd, rather than a PID.
pdwait4() behaves identically to wait4(2), but operates with respect to a process descriptor argument rather than a PID.
The following system calls also have effects specific to process descriptors:
fstat(2) queries status of a process descriptor; currently only the st_mode, st_birthtime, st_atime, st_ctime and st_mtime fields are
defined. If the owner read, write, and execute bits are set then the process represented by the process descriptor is still alive.
poll(2) and select(2) allow waiting for process state transitions; currently only POLLHUP is defined, and will be raised when the process
dies. Process state transitions can also be monitored using kqueue(2) filter EVFILT_PROCDESC; currently only NOTE_EXIT is implemented.
close(2) will close the process descriptor unless PD_DAEMON is set; if the process is still alive and this is the last reference to the
process descriptor, the process will be terminated with the signal SIGKILL.
RETURN VALUES
pdfork() returns a PID, 0 or -1, as fork(2) does.
pdgetpid() and pdkill() return 0 on success and -1 on failure.
pdwait4() returns a PID on success and -1 on failure.
ERRORS
These functions may return the same error numbers as their PID-based equivalents (e.g. pdfork() may return the same error numbers as
fork(2)), with the following additions:
[EINVAL] The signal number given to pdkill() is invalid.
[ENOTCAPABLE] The process descriptor being operated on has insufficient rights (e.g. CAP_PDKILL for pdkill()).
SEE ALSO
close(2), fork(2), fstat(2), kill(2), poll(2), wait4(2), capsicum(4), procdesc(4)
HISTORY
The pdfork(), pdgetpid(), pdkill() and pdwait4() system calls first appeared in FreeBSD 9.0.
Support for process descriptors mode was developed as part of the TrustedBSD Project.
AUTHORS
These functions and the capability facility were created by Robert N. M. Watson <rwatson@FreeBSD.org> and Jonathan Anderson
<jonathan@FreeBSD.org> at the University of Cambridge Computer Laboratory with support from a grant from Google, Inc.
BUGS
pdwait4() has not yet been implemented.
BSD
April 7, 2014 BSD