From 128ef85392f68fa32650deab12d6cd2e01ad52cf Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 10 Nov 2015 16:52:52 +0100 Subject: [PATCH] core: accept time units for time-based resource limits Let's make sure "LimitCPU=30min" can be parsed properly, following the usual logic how we parse time values. Similar for LimitRTTIME=. While we are at it, extend a bit on the man page section about resource limits. Fixes: #1772 Cherry-picked from: a4c1800284e3546bbfab2dc19eb59bcb91c4a2ca Related: #1351415 --- man/systemd.exec.xml | 86 ++++++++++++++++------ src/core/load-fragment-gperf.gperf.m4 | 4 +- src/core/load-fragment.c | 101 ++++++++++++++++++++++++++ src/core/load-fragment.h | 2 + src/test/test-unit-file.c | 61 ++++++++++++++++ 5 files changed, 231 insertions(+), 23 deletions(-) diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index 25aea16553..cfdcc3d173 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -559,90 +559,133 @@ of various resources for executed processes. See setrlimit2 for details. Use the string infinity to - configure no limit on a specific resource. The multiplicative suffixes - K (=1024), M (=1024*1024) and so on for G, T, P and E may be used for - resource limits measured in bytes (e.g. LimitAS=16G). + configure no limit on a specific resource. The multiplicative + suffixes K (=1024), M (=1024*1024) and so on for G, T, P and E + may be used for resource limits measured in bytes + (e.g. LimitAS=16G). For the limits referring to time values, + the usual time units ms, s, min, h and so on may be used (see + systemd.time7 + for details). Note that if no time unit is specified for + LimitCPU= the default unit of seconds is + implied, while for LimitRTTIME= the default + unit of microseconds is implied. Also, note that the effective + granularity of the limits might influence their + enforcement. For example, time limits specified for + LimitCPU= will be rounded up implicitly to + multiples of 1s. + + Note that most process resource limits configured with + these options are per-process, and processes may fork in order + to acquire a new set of resources that are accounted + independently of the original process, and may thus escape + limits set. Also note that LimitRSS= is not + implemented on Linux, and setting it has no effect. Often it + is advisable to prefer the resource controls listed in + systemd.resource-control5 + over these per-process limits, as they apply to services as a + whole, may be altered dynamically at runtime, and are + generally more expressive. For example, + MemoryLimit= is a more powerful (and + working) replacement for LimitRSS=. Limit directives and their equivalent with ulimit - + + Directive ulimit equivalent + Unit - LimitCPU + LimitCPU= ulimit -t + Seconds - LimitFSIZE + LimitFSIZE= ulimit -f + Bytes - LimitDATA + LimitDATA= ulimit -d + Bytes - LimitSTACK + LimitSTACK= ulimit -s + Bytes - LimitCORE + LimitCORE= ulimit -c + Bytes - LimitRSS + LimitRSS= ulimit -m + Bytes - LimitNOFILE + LimitNOFILE= ulimit -n + Number of File Descriptors - LimitAS + LimitAS= ulimit -v + Bytes - LimitNPROC + LimitNPROC= ulimit -u + Number of Processes - LimitMEMLOCK + LimitMEMLOCK= ulimit -l + Bytes - LimitLOCKS + LimitLOCKS= ulimit -x + Number of Locks - LimitSIGPENDING + LimitSIGPENDING= ulimit -i + Number of Queued Signals - LimitMSGQUEUE + LimitMSGQUEUE= ulimit -q + Bytes - LimitNICE + LimitNICE= ulimit -e + Nice Level - LimitRTPRIO + LimitRTPRIO= ulimit -r + Realtime Priority - LimitRTTIME + LimitRTTIME= No equivalent + Microseconds -
+ @@ -1266,6 +1309,7 @@ systemd.mount5, systemd.kill5, systemd.resource-control5, + systemd.time7, systemd.directives7, tmpfiles.d5, exec3 diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4 index c3461a0a69..ce1397c7e8 100644 --- a/src/core/load-fragment-gperf.gperf.m4 +++ b/src/core/load-fragment-gperf.gperf.m4 @@ -58,7 +58,7 @@ $1.RestrictAddressFamilies, config_parse_address_families, 0, $1.SystemCallArchitectures, config_parse_warn_compat, DISABLED_CONFIGURATION, 0 $1.SystemCallErrorNumber, config_parse_warn_compat, DISABLED_CONFIGURATION, 0 $1.RestrictAddressFamilies, config_parse_warn_compat, DISABLED_CONFIGURATION, 0') -$1.LimitCPU, config_parse_limit, RLIMIT_CPU, offsetof($1, exec_context.rlimit) +$1.LimitCPU, config_parse_sec_limit, RLIMIT_CPU, offsetof($1, exec_context.rlimit) $1.LimitFSIZE, config_parse_bytes_limit, RLIMIT_FSIZE, offsetof($1, exec_context.rlimit) $1.LimitDATA, config_parse_bytes_limit, RLIMIT_DATA, offsetof($1, exec_context.rlimit) $1.LimitSTACK, config_parse_bytes_limit, RLIMIT_STACK, offsetof($1, exec_context.rlimit) @@ -73,7 +73,7 @@ $1.LimitSIGPENDING, config_parse_limit, RLIMIT_SIGP $1.LimitMSGQUEUE, config_parse_bytes_limit, RLIMIT_MSGQUEUE, offsetof($1, exec_context.rlimit) $1.LimitNICE, config_parse_limit, RLIMIT_NICE, offsetof($1, exec_context.rlimit) $1.LimitRTPRIO, config_parse_limit, RLIMIT_RTPRIO, offsetof($1, exec_context.rlimit) -$1.LimitRTTIME, config_parse_limit, RLIMIT_RTTIME, offsetof($1, exec_context.rlimit) +$1.LimitRTTIME, config_parse_usec_limit, RLIMIT_RTTIME, offsetof($1, exec_context.rlimit) $1.ReadWriteDirectories, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.read_write_dirs) $1.ReadOnlyDirectories, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.read_only_dirs) $1.InaccessibleDirectories, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.inaccessible_dirs) diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c index dbb45b20f3..8afe9d7e83 100644 --- a/src/core/load-fragment.c +++ b/src/core/load-fragment.c @@ -1162,6 +1162,107 @@ int config_parse_bytes_limit(const char *unit, return 0; } +int config_parse_sec_limit( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + struct rlimit **rl = data; + rlim_t seconds; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + rl += ltype; + + if (streq(rvalue, "infinity")) + seconds = RLIM_INFINITY; + else { + usec_t t; + + r = parse_sec(rvalue, &t); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue); + return 0; + } + + if (t == USEC_INFINITY) + seconds = RLIM_INFINITY; + else + seconds = (rlim_t) (DIV_ROUND_UP(t, USEC_PER_SEC)); + } + + if (!*rl) { + *rl = new(struct rlimit, 1); + if (!*rl) + return log_oom(); + } + + (*rl)->rlim_cur = (*rl)->rlim_max = seconds; + return 0; +} + + +int config_parse_usec_limit( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + struct rlimit **rl = data; + rlim_t useconds; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + rl += ltype; + + if (streq(rvalue, "infinity")) + useconds = RLIM_INFINITY; + else { + usec_t t; + + r = parse_time(rvalue, &t, 1); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue); + return 0; + } + + if (t == USEC_INFINITY) + useconds = RLIM_INFINITY; + else + useconds = (rlim_t) t; + } + + if (!*rl) { + *rl = new(struct rlimit, 1); + if (!*rl) + return log_oom(); + } + + (*rl)->rlim_cur = (*rl)->rlim_max = useconds; + return 0; +} + #ifdef HAVE_SYSV_COMPAT int config_parse_sysv_priority(const char *unit, const char *filename, diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h index 2d509d0cb4..359794d0ac 100644 --- a/src/core/load-fragment.h +++ b/src/core/load-fragment.h @@ -57,6 +57,8 @@ int config_parse_exec_secure_bits(const char *unit, const char *filename, unsign int config_parse_bounding_set(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); int config_parse_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); int config_parse_bytes_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); +int config_parse_sec_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); +int config_parse_usec_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); int config_parse_sysv_priority(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); int config_parse_kill_signal(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); int config_parse_exec_mount_flags(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata); diff --git a/src/test/test-unit-file.c b/src/test/test-unit-file.c index 5500983322..d151737960 100644 --- a/src/test/test-unit-file.c +++ b/src/test/test-unit-file.c @@ -545,6 +545,66 @@ static void test_install_printf(void) { expect(i4, "%U", "0"); } + +static void test_config_parse_rlimit(void) { + struct rlimit * rl[_RLIMIT_MAX] = {}; + + assert_se(config_parse_limit(NULL, "fake", 1, "section", 1, "LimitNOFILE", RLIMIT_NOFILE, "55", rl, NULL) >= 0); + assert_se(rl[RLIMIT_NOFILE]); + assert_se(rl[RLIMIT_NOFILE]->rlim_cur == 55); + assert_se(rl[RLIMIT_NOFILE]->rlim_cur == rl[RLIMIT_NOFILE]->rlim_max); + + assert_se(config_parse_limit(NULL, "fake", 1, "section", 1, "LimitNOFILE", RLIMIT_NOFILE, "infinity", rl, NULL) >= 0); + assert_se(rl[RLIMIT_NOFILE]); + assert_se(rl[RLIMIT_NOFILE]->rlim_cur == RLIM_INFINITY); + assert_se(rl[RLIMIT_NOFILE]->rlim_cur == rl[RLIMIT_NOFILE]->rlim_max); + + rl[RLIMIT_NOFILE] = free(rl[RLIMIT_NOFILE]); + assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "56", rl, NULL) >= 0); + assert_se(rl[RLIMIT_CPU]); + assert_se(rl[RLIMIT_CPU]->rlim_cur == 56); + assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max); + + assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "57s", rl, NULL) >= 0); + assert_se(rl[RLIMIT_CPU]); + assert_se(rl[RLIMIT_CPU]->rlim_cur == 57); + assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max); + + assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "infinity", rl, NULL) >= 0); + assert_se(rl[RLIMIT_CPU]); + assert_se(rl[RLIMIT_CPU]->rlim_cur == RLIM_INFINITY); + assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max); + + assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "1234ms", rl, NULL) >= 0); + assert_se(rl[RLIMIT_CPU]); + assert_se(rl[RLIMIT_CPU]->rlim_cur == 2); + assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max); + + rl[RLIMIT_CPU] = free(rl[RLIMIT_CPU]); + + assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "58", rl, NULL) >= 0); + assert_se(rl[RLIMIT_RTTIME]); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 58); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max); + + assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "59s", rl, NULL) >= 0); + assert_se(rl[RLIMIT_RTTIME]); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 59 * USEC_PER_SEC); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max); + + assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "infinity", rl, NULL) >= 0); + assert_se(rl[RLIMIT_RTTIME]); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == RLIM_INFINITY); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max); + + assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "2345ms", rl, NULL) >= 0); + assert_se(rl[RLIMIT_RTTIME]); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 2345 * USEC_PER_MSEC); + assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max); + + rl[RLIMIT_RTTIME] = free(rl[RLIMIT_RTTIME]); +} + int main(int argc, char *argv[]) { int r; @@ -553,6 +613,7 @@ int main(int argc, char *argv[]) { r = test_unit_file_get_set(); test_config_parse_exec(); + test_config_parse_rlimit(); test_load_env_file_1(); test_load_env_file_2(); test_load_env_file_3();