Mercurial > hg
view mercurial/mpatch.h @ 30921:1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Previously, the lock only contains a hostname as an attempt to detect pid
namespace difference. However, that's not enough on modern Linux - a single
hostname could have different pid namespaces.
That means if people run hg inside different PID namespaces with a same UTS
namespae, the lock would be broken - an hg proccess in pid namespace A will
think the lock having a "random" pid in pid namespace B is "dead" and remove
it.
This patch solves the above issue by appending an PID namespace identifier of
the current process to the lock prefix ("hostname"). It depends on /proc
being mounted properly. But I don't think there is a better way to get pid
namespace identifier reliably.
author | Jun Wu <quark@fb.com> |
---|---|
date | Fri, 10 Feb 2017 13:56:31 -0800 |
parents | 155f0cc3f813 |
children | 761355833867 |
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#ifndef _HG_MPATCH_H_ #define _HG_MPATCH_H_ #define MPATCH_ERR_NO_MEM -3 #define MPATCH_ERR_CANNOT_BE_DECODED -2 #define MPATCH_ERR_INVALID_PATCH -1 struct mpatch_frag { int start, end, len; const char *data; }; struct mpatch_flist { struct mpatch_frag *base, *head, *tail; }; int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist** res); ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l); void mpatch_lfree(struct mpatch_flist *a); int mpatch_apply(char *buf, const char *orig, ssize_t len, struct mpatch_flist *l); struct mpatch_flist *mpatch_fold(void *bins, struct mpatch_flist* (*get_next_item)(void*, ssize_t), ssize_t start, ssize_t end); #endif