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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::64a; envelope-from=3Q1TMaAcKCmoabMdQMIOWWOTM.KWUYMUc-LMdMTVWVOVc.WZO@flex--steviea.bounces.google.com; helo=mail-pl1-x64a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1758221442925116600 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Shu-Chun Weng Some fields make sense even for the emulated process. Some external programs/tests might depend on the fields, e.g. starttime. Signed-off-by: Shu-Chun Weng --- linux-user/syscall.c | 93 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 90 insertions(+), 3 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 91360a072c..7f3d346902 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8216,15 +8216,99 @@ static int open_self_smaps(CPUArchState *cpu_env, i= nt fd) return open_self_maps_1(cpu_env, fd, true); } =20 +#define NUM_PROC_SELF_STAT_FIELDS 52 + +static void read_proc_self_stat(char buf[], int buf_size, const char *fiel= ds[]) +{ + char *p; + int i; + + for (i =3D 0; i < NUM_PROC_SELF_STAT_FIELDS; i++) { + fields[i] =3D NULL; + } + + int fd =3D open("/proc/self/stat", O_RDONLY); + if (fd < 0) { + return; + } + i =3D read(fd, buf, buf_size); + close(fd); + if (i <=3D 0) { + return; + } + if (i =3D=3D buf_size) { + buf[buf_size - 1] =3D '\0'; + } else { + buf[i] =3D '\0'; + } + + fields[0] =3D strtok_r(buf, " \n", &p); + + /* + * Get the next field (comm), but don't tokenize -- we'll need to find= the + * right-most ')' that marks the end of the file name instead. + */ + fields[1] =3D strtok_r(NULL, "", &p); + + p =3D strrchr(fields[1], ')'); + if (!p) { + return; + } + p[1] =3D '\0'; + + fields[2] =3D strtok_r(p + 2, " \n", &p); + for (i =3D 3; i < NUM_PROC_SELF_STAT_FIELDS; i++) { + fields[i] =3D strtok_r(NULL, " \n", &p); + } +} + static int open_self_stat(CPUArchState *cpu_env, int fd) { CPUState *cpu =3D env_cpu(cpu_env); TaskState *ts =3D get_task_state(cpu); g_autoptr(GString) buf =3D g_string_new(NULL); + char host_stat_buf[1024]; + const char *fields[NUM_PROC_SELF_STAT_FIELDS]; + const int use_host_stat_fields[] =3D { + /* + * `man 5 proc` uses 1-based index, so indices here are one less t= han + * on the man page. + */ + 0, /* pid */ + 2, /* state */ + 3, /* ppid */ + 4, /* pgrp */ + 5, /* session */ + 6, /* tty_nr */ + 7, /* tpgid */ + 17, /* priority */ + 18, /* nice */ + 21, /* starttime */ + 38, /* processor */ + 39, /* rt_priority */ + 40, /* policy */ + NUM_PROC_SELF_STAT_FIELDS, /* sentinel */ + }; + int i; + const int *next_use_host_stat_field =3D use_host_stat_fields; + + read_proc_self_stat(host_stat_buf, sizeof(host_stat_buf), fields); + + for (i =3D 0; i < NUM_PROC_SELF_STAT_FIELDS; i++) { + bool may_use_host_stat =3D i =3D=3D (*next_use_host_stat_field); + if (may_use_host_stat) { + ++next_use_host_stat_field; + } =20 - for (i =3D 0; i < 44; i++) { - if (i =3D=3D 0) { + if (may_use_host_stat && fields[i] !=3D NULL && fields[i][0] !=3D = '\0') { + g_string_printf(buf, "%s ", fields[i]); + + /* + * Some systems do not mount /proc so still check for 0 and 3 = even + * though `may_use_host_stat` is true for them. + */ + } else if (i =3D=3D 0) { /* pid */ g_string_printf(buf, FMT_pid " ", getpid()); } else if (i =3D=3D 1) { @@ -8259,7 +8343,8 @@ static int open_self_stat(CPUArchState *cpu_env, int = fd) g_string_printf(buf, TARGET_ABI_FMT_ld " ", ts->info->start_st= ack); } else { /* for the rest, there is MasterCard */ - g_string_printf(buf, "0%c", i =3D=3D 43 ? '\n' : ' '); + g_string_printf(buf, "0%c", + i =3D=3D NUM_PROC_SELF_STAT_FIELDS - 1 ? '\n' = : ' '); } =20 if (write(fd, buf->str, buf->len) !=3D buf->len) { @@ -8270,6 +8355,8 @@ static int open_self_stat(CPUArchState *cpu_env, int = fd) return 0; } =20 +#undef NUM_PROC_SELF_STAT_FIELDS + static int open_self_auxv(CPUArchState *cpu_env, int fd) { CPUState *cpu =3D env_cpu(cpu_env); --=20 2.51.0.470.ga7dc726c21-goog