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sysctl-util: add sysctl_read_ip_property()

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This commit is contained in:
Yu Watanabe 2019-02-18 14:41:43 +09:00
parent 62e021a95d
commit a6b3b0aace
2 changed files with 23 additions and 0 deletions
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22
src/shared/sysctl-util.c
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@ -85,3 +85,25 @@ int sysctl_read(const char *property, char **content) {
p = strjoina("/proc/sys/", property);
return read_full_file(p, content, NULL);
}
int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) {
_cleanup_free_ char *value = NULL;
const char *p;
int r;
assert(IN_SET(af, AF_INET, AF_INET6));
assert(property);
p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6",
ifname ? "/conf/" : "", strempty(ifname),
property[0] == '/' ? "" : "/", property);
r = read_one_line_file(p, &value);
if (r < 0)
return r;
if (ret)
*ret = TAKE_PTR(value);
return r;
}

1
src/shared/sysctl-util.h
View File

@ -12,6 +12,7 @@ char *sysctl_normalize(char *s);
int sysctl_read(const char *property, char **value);
int sysctl_write(const char *property, const char *value);
int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret);
int sysctl_write_ip_property(int af, const char *ifname, const char *property, const char *value);
static inline int sysctl_write_ip_property_boolean(int af, const char *ifname, const char *property, bool value) {
return sysctl_write_ip_property(af, ifname, property, one_zero(value));