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proc: Helper for opening vma's file

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2014-01-31 20:30:47 +04:00
parent 446ab1fc64
commit bbab13ebdb
1 changed files with 40 additions and 30 deletions
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70
proc_parse.c
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@@ -142,6 +142,43 @@ static inline int is_anon_shmem_map(dev_t dev)
return kerndat_shmem_dev == dev;
}
static int vma_get_mapfile(struct vma_area *vma, DIR *mfd)
{
char path[32];
if (!mfd)
return 0;
/* Figure out if it's file mapping */
snprintf(path, sizeof(path), "%lx-%lx", vma->vma.start, vma->vma.end);
/*
* Note that we "open" it in dumper process space
* so later we might refer to it via /proc/self/fd/vm_file_fd
* if needed.
*/
vma->vm_file_fd = openat(dirfd(mfd), path, O_RDONLY);
if (vma->vm_file_fd < 0) {
if (errno == ENXIO) {
struct stat buf;
if (fstatat(dirfd(mfd), path, &buf, 0))
return -1;
if (!S_ISSOCK(buf.st_mode))
return -1;
pr_info("Found socket %"PRIu64" mapping @%lx\n",
buf.st_ino, vma->vma.start);
vma->vma.status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
vma->vm_socket_id = buf.st_ino;
} else if (errno != ENOENT)
return -1;
}
return 0;
}
int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_files)
{
struct vma_area *vma_area = NULL;
@@ -230,41 +267,14 @@ int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_file
goto err;
}
if (map_files_dir) {
char path[32];
/* Figure out if it's file mapping */
snprintf(path, sizeof(path), "%lx-%lx", start, end);
/*
* Note that we "open" it in dumper process space
* so later we might refer to it via /proc/self/fd/vm_file_fd
* if needed.
*/
vma_area->vm_file_fd = openat(dirfd(map_files_dir), path, O_RDONLY);
if (vma_area->vm_file_fd < 0) {
if (errno == ENXIO) {
struct stat buf;
if (fstatat(dirfd(map_files_dir), path, &buf, 0))
goto err_bogus_mapfile;
if (!S_ISSOCK(buf.st_mode))
goto err_bogus_mapfile;
pr_info("Found socket %"PRIu64" mapping @%lx\n", buf.st_ino, start);
vma_area->vma.status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
vma_area->vm_socket_id = buf.st_ino;
} else if (errno != ENOENT)
goto err_bogus_mapfile;
}
}
vma_area->vma.start = start;
vma_area->vma.end = end;
vma_area->vma.pgoff = pgoff;
vma_area->vma.prot = PROT_NONE;
if (vma_get_mapfile(vma_area, map_files_dir))
goto err_bogus_mapfile;
if (r == 'r')
vma_area->vma.prot |= PROT_READ;
if (w == 'w')