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util: Introduce qemu_get_pid_name

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This is a small helper that tries to fetch binary name for given
PID.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Message-Id: <4d75d475c1884f8e94ee8b1e57273ddf3ed68bf7.1474987617.git.mprivozn@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michal Privoznik 2016-09-27 17:24:56 +02:00 • committed by Paolo Bonzini
parent 6a7b2b2100
commit 7dc9ae4339
3 changed files with 44 additions and 0 deletions
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27
util/oslib-posix.c
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@ -46,6 +46,7 @@
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#include <libutil.h>
#endif
#include "qemu/mmap-alloc.h"
@ -430,6 +431,32 @@ int qemu_read_password(char *buf, int buf_size)
}
char *qemu_get_pid_name(pid_t pid)
{
char *name = NULL;
#if defined(__FreeBSD__)
/* BSDs don't have /proc, but they provide a nice substitute */
struct kinfo_proc *proc = kinfo_getproc(pid);
if (proc) {
name = g_strdup(proc->ki_comm);
free(proc);
}
#else
/* Assume a system with reasonable procfs */
char *pid_path;
size_t len;
pid_path = g_strdup_printf("/proc/%d/cmdline", pid);
g_file_get_contents(pid_path, &name, &len, NULL);
g_free(pid_path);
#endif
return name;
}
pid_t qemu_fork(Error **errp)
{
sigset_t oldmask, newmask;