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#include "system.h"
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#include <errno.h>
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#include <sys/resource.h>
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#if defined(__linux__)
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#include <sys/syscall.h> /* For ionice */
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#endif
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#include <rpm/rpmlog.h>
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#include "lib/rpmplugin.h"
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#include "debug.h"
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/*
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* In general we want scriptlets to run with the same priority as rpm
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* itself. However on legacy SysV init systems, properties of the
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* parent process can be inherited by the actual daemons on restart,
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* so you can end up with eg nice/ionice'd mysql or httpd, ouch.
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* This plugin resets the scriptlet process priorities after forking, and
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* can be used to counter that effect. Should not be used with systemd
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* because the it's not needed there, and the effect is counter-productive.
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*/
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static rpmRC prioreset_scriptlet_fork_post(rpmPlugin plugin, const char *path, int type)
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{
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/* Call for resetting nice priority. */
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int ret = setpriority(PRIO_PROCESS, 0, 0);
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if (ret == -1) {
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rpmlog(RPMLOG_WARNING, _("Unable to reset nice value: %s"),
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strerror(errno));
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}
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/* Call for resetting IO priority. */
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#if defined(__linux__)
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/* Defined at include/linux/ioprio.h */
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const int _IOPRIO_WHO_PROCESS = 1;
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const int _IOPRIO_CLASS_NONE = 0;
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ret = syscall(SYS_ioprio_set, _IOPRIO_WHO_PROCESS, 0, _IOPRIO_CLASS_NONE);
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if (ret == -1) {
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rpmlog(RPMLOG_WARNING, _("Unable to reset I/O priority: %s"),
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strerror(errno));
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}
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#endif
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return RPMRC_OK;
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}
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struct rpmPluginHooks_s prioreset_hooks = {
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.scriptlet_fork_post = prioreset_scriptlet_fork_post,
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};
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