killall

NAME
kill - send signal to a process

SYNOPSIS
#include <sys/types.h>
#include <signal.h>

int kill(pid_t pid, int sig);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

kill(): _POSIX_C_SOURCE || _XOPEN_SOURCE

DESCRIPTION
The kill() system call can be used to send any signal to any process group or process.

If pid is positive, then signal sig is sent to pid.

If pid equals 0, then sig is sent to every process in the process group of the current process.

If pid equals -1, then sig is sent to every process for which the calling process has permission to send signals, except for process 1
(init), but see below.

If pid is less than -1, then sig is sent to every process in the process group -pid.

If sig is 0, then no signal is sent, but error checking is still performed.

For a process to have permission to send a signal it must either be privileged (under Linux: have the CAP_KILL capability), or the
real or effective user ID of the sending process must equal the real or saved set-user-ID of the target process. In the case of SIG-
CONT it suffices when the sending and receiving processes belong to the same session.

RETURN VALUE
On success (at least one signal was sent), zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS
EINVAL An invalid signal was specified.

EPERM The process does not have permission to send the signal to any of the target processes.

ESRCH The pid or process group does not exist. Note that an existing process might be a zombie, a process which already committed
termination, but has not yet been wait(2)ed for.

CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001

NOTES
The only signals that can be sent to process ID 1, the init process, are those for which init has explicitly installed signal han-
dlers. This is done to assure the system is not brought down accidentally.

POSIX.1-2001 requires that kill(-1,sig) send sig to all processes that the current process may send signals to, except possibly for
some implementation-defined system processes. Linux allows a process to signal itself, but on Linux the call kill(-1,sig) does not
signal the current process.

POSIX.1-2001 requires that if a process sends a signal to itself, and the sending thread does not have the signal blocked, and no
other thread has it unblocked or is waiting for it in sigwait(3), at least one unblocked signal must be delivered to the sending
thread before the kill().

Linux Notes
Across different kernel versions, Linux has enforced different rules for the permissions required for an unprivileged process to send
a signal to another process. In kernels 1.0 to 1.2.2, a signal could be sent if the effective user ID of the sender matched that of
the receiver, or the real user ID of the sender matched that of the receiver. From kernel 1.2.3 until 1.3.77, a signal could be sent
if the effective user ID of the sender matched either the real or effective user ID of the receiver. The current rules, which conform
to POSIX.1-2001, were adopted in kernel 1.3.78.

BUGS
In 2.6 kernels up to and including 2.6.7, there was a bug that meant that when sending signals to a process group, kill() failed with
the error EPERM if the caller did have permission to send the signal to any (rather than all) of the members of the process group.
Notwithstanding this error return, the signal was still delivered to all of the processes for which the caller had permission to sig-
nal.

SEE ALSO
_exit(2), killpg(2), signal(2), sigqueue(2), tkill(2), exit(3), capabilities(7), credentials(7), signal(7)

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daniel2000lu schrieb:

Hallo,
Vielen Dank für die Antwort.

Leider kann ich mit dem man nicht viel anfangen. War gleich beim 1. Kursus wo dies durchgenommen wurde, und das ging mir zu schnell um mitzukommen. Habe bruchstückhaft mitgeschrieben, doch als ich geschrieben hatte war der schon beim nächsten Kommando, so dass ich leider noch nicht viel schlauer bin.

Kannst du mir das vielleicht auch auf eine sehr vereinfacht Weise erklären? Ist wie gesagt erst der 1. Kursus gewesen...

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daniel2000lu schrieb:

ich denke schon dass wir die system Funktion benutzen dürfen, denn von /proc war noch nicht die Rede, und in meinen Notizen kann ich dies auch nirgends finden. Und aufgeschrieben habe ich recht viel

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daniel2000lu schrieb:

hmm, vielleicht haben wir noch nicht alles gesagt bekommen was ALLE Prozesse angeht. Für uns waren alle Prozesse jene die folgendermassen zu finden sin :

ps -edf | grep NAME

bringt dies was?

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daniel2000lu schrieb:

Weiss jemand wo jetzt noch immer der Fehler liegt?

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char* matchingName = "...";
char buff [1024];

while (fgets (buff, sizeof (buff), dscr))
{
  char procName[256};

  // die nächste Zeile stimmt so noch nicht, sie würde für eine Formatierung
  // "<procName> <pid>" funktionieren
  if ( 2 == sscanf (buff, "%s %d", procName, &pid))
  {
    if ( 0 == strcmp (procName, matchingName))
    {
      kill (pid, 9);
    }
  }
}

daniel2000lu schrieb:

./mykillall konsole 9 ... eine weitere Interaktion soll nicht nötig sein.

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